1 package DBIx::Class::ResultSet;
9 use Carp::Clan qw/^DBIx::Class/;
10 use DBIx::Class::Exception;
13 use DBIx::Class::ResultSetColumn;
14 use DBIx::Class::ResultSourceHandle;
17 use base qw/DBIx::Class/;
19 __PACKAGE__->mk_group_accessors('simple' => qw/_result_class _source_handle/);
23 DBIx::Class::ResultSet - Represents a query used for fetching a set of results.
27 my $users_rs = $schema->resultset('User');
28 my $registered_users_rs = $schema->resultset('User')->search({ registered => 1 });
29 my @cds_in_2005 = $schema->resultset('CD')->search({ year => 2005 })->all();
33 A ResultSet is an object which stores a set of conditions representing
34 a query. It is the backbone of DBIx::Class (i.e. the really
35 important/useful bit).
37 No SQL is executed on the database when a ResultSet is created, it
38 just stores all the conditions needed to create the query.
40 A basic ResultSet representing the data of an entire table is returned
41 by calling C<resultset> on a L<DBIx::Class::Schema> and passing in a
42 L<Source|DBIx::Class::Manual::Glossary/Source> name.
44 my $users_rs = $schema->resultset('User');
46 A new ResultSet is returned from calling L</search> on an existing
47 ResultSet. The new one will contain all the conditions of the
48 original, plus any new conditions added in the C<search> call.
50 A ResultSet also incorporates an implicit iterator. L</next> and L</reset>
51 can be used to walk through all the L<DBIx::Class::Row>s the ResultSet
54 The query that the ResultSet represents is B<only> executed against
55 the database when these methods are called:
56 L</find> L</next> L</all> L</first> L</single> L</count>
60 =head2 Chaining resultsets
62 Let's say you've got a query that needs to be run to return some data
63 to the user. But, you have an authorization system in place that
64 prevents certain users from seeing certain information. So, you want
65 to construct the basic query in one method, but add constraints to it in
70 my $request = $self->get_request; # Get a request object somehow.
71 my $schema = $self->get_schema; # Get the DBIC schema object somehow.
73 my $cd_rs = $schema->resultset('CD')->search({
74 title => $request->param('title'),
75 year => $request->param('year'),
78 $self->apply_security_policy( $cd_rs );
83 sub apply_security_policy {
92 =head3 Resolving conditions and attributes
94 When a resultset is chained from another resultset, conditions and
95 attributes with the same keys need resolving.
97 L</join>, L</prefetch>, L</+select>, L</+as> attributes are merged
98 into the existing ones from the original resultset.
100 The L</where>, L</having> attribute, and any search conditions are
101 merged with an SQL C<AND> to the existing condition from the original
104 All other attributes are overridden by any new ones supplied in the
107 =head2 Multiple queries
109 Since a resultset just defines a query, you can do all sorts of
110 things with it with the same object.
112 # Don't hit the DB yet.
113 my $cd_rs = $schema->resultset('CD')->search({
114 title => 'something',
118 # Each of these hits the DB individually.
119 my $count = $cd_rs->count;
120 my $most_recent = $cd_rs->get_column('date_released')->max();
121 my @records = $cd_rs->all;
123 And it's not just limited to SELECT statements.
129 $cd_rs->create({ artist => 'Fred' });
131 Which is the same as:
133 $schema->resultset('CD')->create({
134 title => 'something',
139 See: L</search>, L</count>, L</get_column>, L</all>, L</create>.
143 If a resultset is used in a numeric context it returns the L</count>.
144 However, if it is used in a booleand context it is always true. So if
145 you want to check if a resultset has any results use C<if $rs != 0>.
146 C<if $rs> will always be true.
154 =item Arguments: $source, \%$attrs
156 =item Return Value: $rs
160 The resultset constructor. Takes a source object (usually a
161 L<DBIx::Class::ResultSourceProxy::Table>) and an attribute hash (see
162 L</ATTRIBUTES> below). Does not perform any queries -- these are
163 executed as needed by the other methods.
165 Generally you won't need to construct a resultset manually. You'll
166 automatically get one from e.g. a L</search> called in scalar context:
168 my $rs = $schema->resultset('CD')->search({ title => '100th Window' });
170 IMPORTANT: If called on an object, proxies to new_result instead so
172 my $cd = $schema->resultset('CD')->new({ title => 'Spoon' });
174 will return a CD object, not a ResultSet.
180 return $class->new_result(@_) if ref $class;
182 my ($source, $attrs) = @_;
183 $source = $source->handle
184 unless $source->isa('DBIx::Class::ResultSourceHandle');
185 $attrs = { %{$attrs||{}} };
187 if ($attrs->{page}) {
188 $attrs->{rows} ||= 10;
191 $attrs->{alias} ||= 'me';
193 # Creation of {} and bless separated to mitigate RH perl bug
194 # see https://bugzilla.redhat.com/show_bug.cgi?id=196836
196 _source_handle => $source,
197 cond => $attrs->{where},
206 $attrs->{result_class} || $source->resolve->result_class
216 =item Arguments: $cond, \%attrs?
218 =item Return Value: $resultset (scalar context), @row_objs (list context)
222 my @cds = $cd_rs->search({ year => 2001 }); # "... WHERE year = 2001"
223 my $new_rs = $cd_rs->search({ year => 2005 });
225 my $new_rs = $cd_rs->search([ { year => 2005 }, { year => 2004 } ]);
226 # year = 2005 OR year = 2004
228 If you need to pass in additional attributes but no additional condition,
229 call it as C<search(undef, \%attrs)>.
231 # "SELECT name, artistid FROM $artist_table"
232 my @all_artists = $schema->resultset('Artist')->search(undef, {
233 columns => [qw/name artistid/],
236 For a list of attributes that can be passed to C<search>, see
237 L</ATTRIBUTES>. For more examples of using this function, see
238 L<Searching|DBIx::Class::Manual::Cookbook/Searching>. For a complete
239 documentation for the first argument, see L<SQL::Abstract>.
241 For more help on using joins with search, see L<DBIx::Class::Manual::Joining>.
247 my $rs = $self->search_rs( @_ );
248 return (wantarray ? $rs->all : $rs);
255 =item Arguments: $cond, \%attrs?
257 =item Return Value: $resultset
261 This method does the same exact thing as search() except it will
262 always return a resultset, even in list context.
269 # Special-case handling for (undef, undef).
270 if ( @_ == 2 && !defined $_[1] && !defined $_[0] ) {
275 $attrs = pop(@_) if @_ > 1 and ref $_[$#_] eq 'HASH';
276 my $our_attrs = { %{$self->{attrs}} };
277 my $having = delete $our_attrs->{having};
278 my $where = delete $our_attrs->{where};
282 my %safe = (alias => 1, cache => 1);
285 (@_ && defined($_[0])) # @_ == () or (undef)
287 (keys %$attrs # empty attrs or only 'safe' attrs
288 && List::Util::first { !$safe{$_} } keys %$attrs)
290 # no search, effectively just a clone
291 $rows = $self->get_cache;
294 # reset the selector list
295 if (List::Util::first { exists $attrs->{$_} } qw{columns select as}) {
296 delete @{$our_attrs}{qw{select as columns +select +as +columns include_columns}};
299 my $new_attrs = { %{$our_attrs}, %{$attrs} };
301 # merge new attrs into inherited
302 foreach my $key (qw/join prefetch +select +as +columns include_columns bind/) {
303 next unless exists $attrs->{$key};
304 $new_attrs->{$key} = $self->_merge_attr($our_attrs->{$key}, $attrs->{$key});
309 (@_ == 1 || ref $_[0] eq "HASH")
311 (ref $_[0] eq 'HASH')
313 (keys %{ $_[0] } > 0)
321 ? $self->throw_exception("Odd number of arguments to search")
328 if (defined $where) {
329 $new_attrs->{where} = (
330 defined $new_attrs->{where}
333 ref $_ eq 'ARRAY' ? [ -or => $_ ] : $_
334 } $where, $new_attrs->{where}
341 $new_attrs->{where} = (
342 defined $new_attrs->{where}
345 ref $_ eq 'ARRAY' ? [ -or => $_ ] : $_
346 } $cond, $new_attrs->{where}
352 if (defined $having) {
353 $new_attrs->{having} = (
354 defined $new_attrs->{having}
357 ref $_ eq 'ARRAY' ? [ -or => $_ ] : $_
358 } $having, $new_attrs->{having}
364 my $rs = (ref $self)->new($self->result_source, $new_attrs);
366 $rs->set_cache($rows) if ($rows);
371 =head2 search_literal
375 =item Arguments: $sql_fragment, @bind_values
377 =item Return Value: $resultset (scalar context), @row_objs (list context)
381 my @cds = $cd_rs->search_literal('year = ? AND title = ?', qw/2001 Reload/);
382 my $newrs = $artist_rs->search_literal('name = ?', 'Metallica');
384 Pass a literal chunk of SQL to be added to the conditional part of the
387 CAVEAT: C<search_literal> is provided for Class::DBI compatibility and should
388 only be used in that context. C<search_literal> is a convenience method.
389 It is equivalent to calling $schema->search(\[]), but if you want to ensure
390 columns are bound correctly, use C<search>.
392 Example of how to use C<search> instead of C<search_literal>
394 my @cds = $cd_rs->search_literal('cdid = ? AND (artist = ? OR artist = ?)', (2, 1, 2));
395 my @cds = $cd_rs->search(\[ 'cdid = ? AND (artist = ? OR artist = ?)', [ 'cdid', 2 ], [ 'artist', 1 ], [ 'artist', 2 ] ]);
398 See L<DBIx::Class::Manual::Cookbook/Searching> and
399 L<DBIx::Class::Manual::FAQ/Searching> for searching techniques that do not
400 require C<search_literal>.
405 my ($self, $sql, @bind) = @_;
407 if ( @bind && ref($bind[-1]) eq 'HASH' ) {
410 return $self->search(\[ $sql, map [ __DUMMY__ => $_ ], @bind ], ($attr || () ));
417 =item Arguments: @values | \%cols, \%attrs?
419 =item Return Value: $row_object | undef
423 Finds a row based on its primary key or unique constraint. For example, to find
424 a row by its primary key:
426 my $cd = $schema->resultset('CD')->find(5);
428 You can also find a row by a specific unique constraint using the C<key>
429 attribute. For example:
431 my $cd = $schema->resultset('CD')->find('Massive Attack', 'Mezzanine', {
432 key => 'cd_artist_title'
435 Additionally, you can specify the columns explicitly by name:
437 my $cd = $schema->resultset('CD')->find(
439 artist => 'Massive Attack',
440 title => 'Mezzanine',
442 { key => 'cd_artist_title' }
445 If the C<key> is specified as C<primary>, it searches only on the primary key.
447 If no C<key> is specified, it searches on all unique constraints defined on the
448 source for which column data is provided, including the primary key.
450 If your table does not have a primary key, you B<must> provide a value for the
451 C<key> attribute matching one of the unique constraints on the source.
453 In addition to C<key>, L</find> recognizes and applies standard
454 L<resultset attributes|/ATTRIBUTES> in the same way as L</search> does.
456 Note: If your query does not return only one row, a warning is generated:
458 Query returned more than one row
460 See also L</find_or_create> and L</update_or_create>. For information on how to
461 declare unique constraints, see
462 L<DBIx::Class::ResultSource/add_unique_constraint>.
468 my $attrs = (@_ > 1 && ref $_[$#_] eq 'HASH' ? pop(@_) : {});
470 # Default to the primary key, but allow a specific key
471 my @cols = exists $attrs->{key}
472 ? $self->result_source->unique_constraint_columns($attrs->{key})
473 : $self->result_source->primary_columns;
474 $self->throw_exception(
475 "Can't find unless a primary key is defined or unique constraint is specified"
478 # Parse out a hashref from input
480 if (ref $_[0] eq 'HASH') {
481 $input_query = { %{$_[0]} };
483 elsif (@_ == @cols) {
485 @{$input_query}{@cols} = @_;
488 # Compatibility: Allow e.g. find(id => $value)
489 carp "Find by key => value deprecated; please use a hashref instead";
493 my (%related, $info);
495 KEY: foreach my $key (keys %$input_query) {
496 if (ref($input_query->{$key})
497 && ($info = $self->result_source->relationship_info($key))) {
498 my $val = delete $input_query->{$key};
499 next KEY if (ref($val) eq 'ARRAY'); # has_many for multi_create
500 my $rel_q = $self->result_source->_resolve_condition(
501 $info->{cond}, $val, $key
503 die "Can't handle OR join condition in find" if ref($rel_q) eq 'ARRAY';
504 @related{keys %$rel_q} = values %$rel_q;
507 if (my @keys = keys %related) {
508 @{$input_query}{@keys} = values %related;
512 # Build the final query: Default to the disjunction of the unique queries,
513 # but allow the input query in case the ResultSet defines the query or the
514 # user is abusing find
515 my $alias = exists $attrs->{alias} ? $attrs->{alias} : $self->{attrs}{alias};
517 if (exists $attrs->{key}) {
518 my @unique_cols = $self->result_source->unique_constraint_columns($attrs->{key});
519 my $unique_query = $self->_build_unique_query($input_query, \@unique_cols);
520 $query = $self->_add_alias($unique_query, $alias);
522 elsif ($self->{attrs}{accessor} and $self->{attrs}{accessor} eq 'single') {
523 # This means that we got here after a merger of relationship conditions
524 # in ::Relationship::Base::search_related (the row method), and furthermore
525 # the relationship is of the 'single' type. This means that the condition
526 # provided by the relationship (already attached to $self) is sufficient,
527 # as there can be only one row in the databse that would satisfy the
531 my @unique_queries = $self->_unique_queries($input_query, $attrs);
532 $query = @unique_queries
533 ? [ map { $self->_add_alias($_, $alias) } @unique_queries ]
534 : $self->_add_alias($input_query, $alias);
538 my $rs = $self->search ($query, {result_class => $self->result_class, %$attrs});
539 if (keys %{$rs->_resolved_attrs->{collapse}}) {
541 carp "Query returned more than one row" if $rs->next;
551 # Add the specified alias to the specified query hash. A copy is made so the
552 # original query is not modified.
555 my ($self, $query, $alias) = @_;
557 my %aliased = %$query;
558 foreach my $col (grep { ! m/\./ } keys %aliased) {
559 $aliased{"$alias.$col"} = delete $aliased{$col};
567 # Build a list of queries which satisfy unique constraints.
569 sub _unique_queries {
570 my ($self, $query, $attrs) = @_;
572 my @constraint_names = exists $attrs->{key}
574 : $self->result_source->unique_constraint_names;
576 my $where = $self->_collapse_cond($self->{attrs}{where} || {});
577 my $num_where = scalar keys %$where;
579 my (@unique_queries, %seen_column_combinations);
580 foreach my $name (@constraint_names) {
581 my @constraint_cols = $self->result_source->unique_constraint_columns($name);
583 my $constraint_sig = join "\x00", sort @constraint_cols;
584 next if $seen_column_combinations{$constraint_sig}++;
586 my $unique_query = $self->_build_unique_query($query, \@constraint_cols);
588 my $num_cols = scalar @constraint_cols;
589 my $num_query = scalar keys %$unique_query;
591 my $total = $num_query + $num_where;
592 if ($num_query && ($num_query == $num_cols || $total == $num_cols)) {
593 # The query is either unique on its own or is unique in combination with
594 # the existing where clause
595 push @unique_queries, $unique_query;
599 return @unique_queries;
602 # _build_unique_query
604 # Constrain the specified query hash based on the specified column names.
606 sub _build_unique_query {
607 my ($self, $query, $unique_cols) = @_;
610 map { $_ => $query->{$_} }
611 grep { exists $query->{$_} }
616 =head2 search_related
620 =item Arguments: $rel, $cond, \%attrs?
622 =item Return Value: $new_resultset
626 $new_rs = $cd_rs->search_related('artist', {
630 Searches the specified relationship, optionally specifying a condition and
631 attributes for matching records. See L</ATTRIBUTES> for more information.
636 return shift->related_resultset(shift)->search(@_);
639 =head2 search_related_rs
641 This method works exactly the same as search_related, except that
642 it guarantees a restultset, even in list context.
646 sub search_related_rs {
647 return shift->related_resultset(shift)->search_rs(@_);
654 =item Arguments: none
656 =item Return Value: $cursor
660 Returns a storage-driven cursor to the given resultset. See
661 L<DBIx::Class::Cursor> for more information.
668 my $attrs = $self->_resolved_attrs_copy;
670 return $self->{cursor}
671 ||= $self->result_source->storage->select($attrs->{from}, $attrs->{select},
672 $attrs->{where},$attrs);
679 =item Arguments: $cond?
681 =item Return Value: $row_object?
685 my $cd = $schema->resultset('CD')->single({ year => 2001 });
687 Inflates the first result without creating a cursor if the resultset has
688 any records in it; if not returns nothing. Used by L</find> as a lean version of
691 While this method can take an optional search condition (just like L</search>)
692 being a fast-code-path it does not recognize search attributes. If you need to
693 add extra joins or similar, call L</search> and then chain-call L</single> on the
694 L<DBIx::Class::ResultSet> returned.
700 As of 0.08100, this method enforces the assumption that the preceeding
701 query returns only one row. If more than one row is returned, you will receive
704 Query returned more than one row
706 In this case, you should be using L</next> or L</find> instead, or if you really
707 know what you are doing, use the L</rows> attribute to explicitly limit the size
710 This method will also throw an exception if it is called on a resultset prefetching
711 has_many, as such a prefetch implies fetching multiple rows from the database in
712 order to assemble the resulting object.
719 my ($self, $where) = @_;
721 $self->throw_exception('single() only takes search conditions, no attributes. You want ->search( $cond, $attrs )->single()');
724 my $attrs = $self->_resolved_attrs_copy;
726 if (keys %{$attrs->{collapse}}) {
727 $self->throw_exception(
728 'single() can not be used on resultsets prefetching has_many. Use find( \%cond ) or next() instead'
733 if (defined $attrs->{where}) {
736 [ map { ref $_ eq 'ARRAY' ? [ -or => $_ ] : $_ }
737 $where, delete $attrs->{where} ]
740 $attrs->{where} = $where;
744 # XXX: Disabled since it doesn't infer uniqueness in all cases
745 # unless ($self->_is_unique_query($attrs->{where})) {
746 # carp "Query not guaranteed to return a single row"
747 # . "; please declare your unique constraints or use search instead";
750 my @data = $self->result_source->storage->select_single(
751 $attrs->{from}, $attrs->{select},
752 $attrs->{where}, $attrs
755 return (@data ? ($self->_construct_object(@data))[0] : undef);
761 # Try to determine if the specified query is guaranteed to be unique, based on
762 # the declared unique constraints.
764 sub _is_unique_query {
765 my ($self, $query) = @_;
767 my $collapsed = $self->_collapse_query($query);
768 my $alias = $self->{attrs}{alias};
770 foreach my $name ($self->result_source->unique_constraint_names) {
771 my @unique_cols = map {
773 } $self->result_source->unique_constraint_columns($name);
775 # Count the values for each unique column
776 my %seen = map { $_ => 0 } @unique_cols;
778 foreach my $key (keys %$collapsed) {
779 my $aliased = $key =~ /\./ ? $key : "$alias.$key";
780 next unless exists $seen{$aliased}; # Additional constraints are okay
781 $seen{$aliased} = scalar keys %{ $collapsed->{$key} };
784 # If we get 0 or more than 1 value for a column, it's not necessarily unique
785 return 1 unless grep { $_ != 1 } values %seen;
793 # Recursively collapse the query, accumulating values for each column.
795 sub _collapse_query {
796 my ($self, $query, $collapsed) = @_;
800 if (ref $query eq 'ARRAY') {
801 foreach my $subquery (@$query) {
802 next unless ref $subquery; # -or
803 $collapsed = $self->_collapse_query($subquery, $collapsed);
806 elsif (ref $query eq 'HASH') {
807 if (keys %$query and (keys %$query)[0] eq '-and') {
808 foreach my $subquery (@{$query->{-and}}) {
809 $collapsed = $self->_collapse_query($subquery, $collapsed);
813 foreach my $col (keys %$query) {
814 my $value = $query->{$col};
815 $collapsed->{$col}{$value}++;
827 =item Arguments: $cond?
829 =item Return Value: $resultsetcolumn
833 my $max_length = $rs->get_column('length')->max;
835 Returns a L<DBIx::Class::ResultSetColumn> instance for a column of the ResultSet.
840 my ($self, $column) = @_;
841 my $new = DBIx::Class::ResultSetColumn->new($self, $column);
849 =item Arguments: $cond, \%attrs?
851 =item Return Value: $resultset (scalar context), @row_objs (list context)
855 # WHERE title LIKE '%blue%'
856 $cd_rs = $rs->search_like({ title => '%blue%'});
858 Performs a search, but uses C<LIKE> instead of C<=> as the condition. Note
859 that this is simply a convenience method retained for ex Class::DBI users.
860 You most likely want to use L</search> with specific operators.
862 For more information, see L<DBIx::Class::Manual::Cookbook>.
864 This method is deprecated and will be removed in 0.09. Use L</search()>
865 instead. An example conversion is:
867 ->search_like({ foo => 'bar' });
871 ->search({ foo => { like => 'bar' } });
878 'search_like() is deprecated and will be removed in DBIC version 0.09.'
879 .' Instead use ->search({ x => { -like => "y%" } })'
880 .' (note the outer pair of {}s - they are important!)'
882 my $attrs = (@_ > 1 && ref $_[$#_] eq 'HASH' ? pop(@_) : {});
883 my $query = ref $_[0] eq 'HASH' ? { %{shift()} }: {@_};
884 $query->{$_} = { 'like' => $query->{$_} } for keys %$query;
885 return $class->search($query, { %$attrs });
892 =item Arguments: $first, $last
894 =item Return Value: $resultset (scalar context), @row_objs (list context)
898 Returns a resultset or object list representing a subset of elements from the
899 resultset slice is called on. Indexes are from 0, i.e., to get the first
902 my ($one, $two, $three) = $rs->slice(0, 2);
907 my ($self, $min, $max) = @_;
908 my $attrs = {}; # = { %{ $self->{attrs} || {} } };
909 $attrs->{offset} = $self->{attrs}{offset} || 0;
910 $attrs->{offset} += $min;
911 $attrs->{rows} = ($max ? ($max - $min + 1) : 1);
912 return $self->search(undef(), $attrs);
913 #my $slice = (ref $self)->new($self->result_source, $attrs);
914 #return (wantarray ? $slice->all : $slice);
921 =item Arguments: none
923 =item Return Value: $result?
927 Returns the next element in the resultset (C<undef> is there is none).
929 Can be used to efficiently iterate over records in the resultset:
931 my $rs = $schema->resultset('CD')->search;
932 while (my $cd = $rs->next) {
936 Note that you need to store the resultset object, and call C<next> on it.
937 Calling C<< resultset('Table')->next >> repeatedly will always return the
938 first record from the resultset.
944 if (my $cache = $self->get_cache) {
945 $self->{all_cache_position} ||= 0;
946 return $cache->[$self->{all_cache_position}++];
948 if ($self->{attrs}{cache}) {
949 $self->{all_cache_position} = 1;
950 return ($self->all)[0];
952 if ($self->{stashed_objects}) {
953 my $obj = shift(@{$self->{stashed_objects}});
954 delete $self->{stashed_objects} unless @{$self->{stashed_objects}};
958 exists $self->{stashed_row}
959 ? @{delete $self->{stashed_row}}
960 : $self->cursor->next
962 return undef unless (@row);
963 my ($row, @more) = $self->_construct_object(@row);
964 $self->{stashed_objects} = \@more if @more;
968 sub _construct_object {
969 my ($self, @row) = @_;
971 my $info = $self->_collapse_result($self->{_attrs}{as}, \@row)
973 my @new = $self->result_class->inflate_result($self->result_source, @$info);
974 @new = $self->{_attrs}{record_filter}->(@new)
975 if exists $self->{_attrs}{record_filter};
979 sub _collapse_result {
980 my ($self, $as_proto, $row) = @_;
984 # 'foo' => [ undef, 'foo' ]
985 # 'foo.bar' => [ 'foo', 'bar' ]
986 # 'foo.bar.baz' => [ 'foo.bar', 'baz' ]
988 my @construct_as = map { [ (/^(?:(.*)\.)?([^.]+)$/) ] } @$as_proto;
990 my %collapse = %{$self->{_attrs}{collapse}||{}};
994 # if we're doing collapsing (has_many prefetch) we need to grab records
995 # until the PK changes, so fill @pri_index. if not, we leave it empty so
996 # we know we don't have to bother.
998 # the reason for not using the collapse stuff directly is because if you
999 # had for e.g. two artists in a row with no cds, the collapse info for
1000 # both would be NULL (undef) so you'd lose the second artist
1002 # store just the index so we can check the array positions from the row
1003 # without having to contruct the full hash
1005 if (keys %collapse) {
1006 my %pri = map { ($_ => 1) } $self->result_source->primary_columns;
1007 foreach my $i (0 .. $#construct_as) {
1008 next if defined($construct_as[$i][0]); # only self table
1009 if (delete $pri{$construct_as[$i][1]}) {
1010 push(@pri_index, $i);
1012 last unless keys %pri; # short circuit (Johnny Five Is Alive!)
1016 # no need to do an if, it'll be empty if @pri_index is empty anyway
1018 my %pri_vals = map { ($_ => $copy[$_]) } @pri_index;
1022 do { # no need to check anything at the front, we always want the first row
1026 foreach my $this_as (@construct_as) {
1027 $const{$this_as->[0]||''}{$this_as->[1]} = shift(@copy);
1030 push(@const_rows, \%const);
1032 } until ( # no pri_index => no collapse => drop straight out
1035 do { # get another row, stash it, drop out if different PK
1037 @copy = $self->cursor->next;
1038 $self->{stashed_row} = \@copy;
1040 # last thing in do block, counts as true if anything doesn't match
1042 # check xor defined first for NULL vs. NOT NULL then if one is
1043 # defined the other must be so check string equality
1046 (defined $pri_vals{$_} ^ defined $copy[$_])
1047 || (defined $pri_vals{$_} && ($pri_vals{$_} ne $copy[$_]))
1052 my $alias = $self->{attrs}{alias};
1059 foreach my $const (@const_rows) {
1060 scalar @const_keys or do {
1061 @const_keys = sort { length($a) <=> length($b) } keys %$const;
1063 foreach my $key (@const_keys) {
1066 my @parts = split(/\./, $key);
1068 my $data = $const->{$key};
1069 foreach my $p (@parts) {
1070 $target = $target->[1]->{$p} ||= [];
1072 if ($cur eq ".${key}" && (my @ckey = @{$collapse{$cur}||[]})) {
1073 # collapsing at this point and on final part
1074 my $pos = $collapse_pos{$cur};
1075 CK: foreach my $ck (@ckey) {
1076 if (!defined $pos->{$ck} || $pos->{$ck} ne $data->{$ck}) {
1077 $collapse_pos{$cur} = $data;
1078 delete @collapse_pos{ # clear all positioning for sub-entries
1079 grep { m/^\Q${cur}.\E/ } keys %collapse_pos
1086 if (exists $collapse{$cur}) {
1087 $target = $target->[-1];
1090 $target->[0] = $data;
1092 $info->[0] = $const->{$key};
1100 =head2 result_source
1104 =item Arguments: $result_source?
1106 =item Return Value: $result_source
1110 An accessor for the primary ResultSource object from which this ResultSet
1117 =item Arguments: $result_class?
1119 =item Return Value: $result_class
1123 An accessor for the class to use when creating row objects. Defaults to
1124 C<< result_source->result_class >> - which in most cases is the name of the
1125 L<"table"|DBIx::Class::Manual::Glossary/"ResultSource"> class.
1127 Note that changing the result_class will also remove any components
1128 that were originally loaded in the source class via
1129 L<DBIx::Class::ResultSource/load_components>. Any overloaded methods
1130 in the original source class will not run.
1135 my ($self, $result_class) = @_;
1136 if ($result_class) {
1137 $self->ensure_class_loaded($result_class);
1138 $self->_result_class($result_class);
1140 $self->_result_class;
1147 =item Arguments: $cond, \%attrs??
1149 =item Return Value: $count
1153 Performs an SQL C<COUNT> with the same query as the resultset was built
1154 with to find the number of elements. Passing arguments is equivalent to
1155 C<< $rs->search ($cond, \%attrs)->count >>
1161 return $self->search(@_)->count if @_ and defined $_[0];
1162 return scalar @{ $self->get_cache } if $self->get_cache;
1164 my $attrs = $self->_resolved_attrs_copy;
1166 # this is a little optimization - it is faster to do the limit
1167 # adjustments in software, instead of a subquery
1168 my $rows = delete $attrs->{rows};
1169 my $offset = delete $attrs->{offset};
1172 if ($self->_has_resolved_attr (qw/collapse group_by/)) {
1173 $crs = $self->_count_subq_rs ($attrs);
1176 $crs = $self->_count_rs ($attrs);
1178 my $count = $crs->next;
1180 $count -= $offset if $offset;
1181 $count = $rows if $rows and $rows < $count;
1182 $count = 0 if ($count < 0);
1191 =item Arguments: $cond, \%attrs??
1193 =item Return Value: $count_rs
1197 Same as L</count> but returns a L<DBIx::Class::ResultSetColumn> object.
1198 This can be very handy for subqueries:
1200 ->search( { amount => $some_rs->count_rs->as_query } )
1202 As with regular resultsets the SQL query will be executed only after
1203 the resultset is accessed via L</next> or L</all>. That would return
1204 the same single value obtainable via L</count>.
1210 return $self->search(@_)->count_rs if @_;
1212 # this may look like a lack of abstraction (count() does about the same)
1213 # but in fact an _rs *must* use a subquery for the limits, as the
1214 # software based limiting can not be ported if this $rs is to be used
1215 # in a subquery itself (i.e. ->as_query)
1216 if ($self->_has_resolved_attr (qw/collapse group_by offset rows/)) {
1217 return $self->_count_subq_rs;
1220 return $self->_count_rs;
1225 # returns a ResultSetColumn object tied to the count query
1228 my ($self, $attrs) = @_;
1230 my $rsrc = $self->result_source;
1231 $attrs ||= $self->_resolved_attrs;
1233 my $tmp_attrs = { %$attrs };
1235 # take off any limits, record_filter is cdbi, and no point of ordering a count
1236 delete $tmp_attrs->{$_} for (qw/select as rows offset order_by record_filter/);
1238 # overwrite the selector (supplied by the storage)
1239 $tmp_attrs->{select} = $rsrc->storage->_count_select ($rsrc, $tmp_attrs);
1240 $tmp_attrs->{as} = 'count';
1242 my $tmp_rs = $rsrc->resultset_class->new($rsrc, $tmp_attrs)->get_column ('count');
1248 # same as above but uses a subquery
1250 sub _count_subq_rs {
1251 my ($self, $attrs) = @_;
1253 my $rsrc = $self->result_source;
1254 $attrs ||= $self->_resolved_attrs_copy;
1256 my $sub_attrs = { %$attrs };
1258 # extra selectors do not go in the subquery and there is no point of ordering it
1259 delete $sub_attrs->{$_} for qw/collapse select _prefetch_select as order_by/;
1261 # if we multi-prefetch we group_by primary keys only as this is what we would
1262 # get out of the rs via ->next/->all. We *DO WANT* to clobber old group_by regardless
1263 if ( keys %{$attrs->{collapse}} ) {
1264 $sub_attrs->{group_by} = [ map { "$attrs->{alias}.$_" } ($rsrc->primary_columns) ]
1267 $sub_attrs->{select} = $rsrc->storage->_subq_count_select ($rsrc, $sub_attrs);
1269 # this is so that the query can be simplified e.g.
1270 # * ordering can be thrown away in things like Top limit
1271 $sub_attrs->{-for_count_only} = 1;
1273 my $sub_rs = $rsrc->resultset_class->new ($rsrc, $sub_attrs);
1276 -alias => 'count_subq',
1277 -source_handle => $rsrc->handle,
1278 count_subq => $sub_rs->as_query,
1281 # the subquery replaces this
1282 delete $attrs->{$_} for qw/where bind collapse group_by having having_bind rows offset/;
1284 return $self->_count_rs ($attrs);
1291 =head2 count_literal
1295 =item Arguments: $sql_fragment, @bind_values
1297 =item Return Value: $count
1301 Counts the results in a literal query. Equivalent to calling L</search_literal>
1302 with the passed arguments, then L</count>.
1306 sub count_literal { shift->search_literal(@_)->count; }
1312 =item Arguments: none
1314 =item Return Value: @objects
1318 Returns all elements in the resultset. Called implicitly if the resultset
1319 is returned in list context.
1326 $self->throw_exception("all() doesn't take any arguments, you probably wanted ->search(...)->all()");
1329 return @{ $self->get_cache } if $self->get_cache;
1333 if (keys %{$self->_resolved_attrs->{collapse}}) {
1334 # Using $self->cursor->all is really just an optimisation.
1335 # If we're collapsing has_many prefetches it probably makes
1336 # very little difference, and this is cleaner than hacking
1337 # _construct_object to survive the approach
1338 $self->cursor->reset;
1339 my @row = $self->cursor->next;
1341 push(@obj, $self->_construct_object(@row));
1342 @row = (exists $self->{stashed_row}
1343 ? @{delete $self->{stashed_row}}
1344 : $self->cursor->next);
1347 @obj = map { $self->_construct_object(@$_) } $self->cursor->all;
1350 $self->set_cache(\@obj) if $self->{attrs}{cache};
1359 =item Arguments: none
1361 =item Return Value: $self
1365 Resets the resultset's cursor, so you can iterate through the elements again.
1366 Implicitly resets the storage cursor, so a subsequent L</next> will trigger
1373 delete $self->{_attrs} if exists $self->{_attrs};
1374 $self->{all_cache_position} = 0;
1375 $self->cursor->reset;
1383 =item Arguments: none
1385 =item Return Value: $object?
1389 Resets the resultset and returns an object for the first result (if the
1390 resultset returns anything).
1395 return $_[0]->reset->next;
1401 # Determines whether and what type of subquery is required for the $rs operation.
1402 # If grouping is necessary either supplies its own, or verifies the current one
1403 # After all is done delegates to the proper storage method.
1405 sub _rs_update_delete {
1406 my ($self, $op, $values) = @_;
1408 my $rsrc = $self->result_source;
1410 # if a condition exists we need to strip all table qualifiers
1411 # if this is not possible we'll force a subquery below
1412 my $cond = $rsrc->schema->storage->_strip_cond_qualifiers ($self->{cond});
1414 my $needs_group_by_subq = $self->_has_resolved_attr (qw/collapse group_by -join/);
1415 my $needs_subq = $needs_group_by_subq || (not defined $cond) || $self->_has_resolved_attr(qw/row offset/);
1417 if ($needs_group_by_subq or $needs_subq) {
1419 # make a new $rs selecting only the PKs (that's all we really need)
1420 my $attrs = $self->_resolved_attrs_copy;
1422 delete $attrs->{$_} for qw/collapse select as/;
1423 $attrs->{columns} = [ map { "$attrs->{alias}.$_" } ($self->result_source->primary_columns) ];
1425 if ($needs_group_by_subq) {
1426 # make sure no group_by was supplied, or if there is one - make sure it matches
1427 # the columns compiled above perfectly. Anything else can not be sanely executed
1428 # on most databases so croak right then and there
1430 if (my $g = $attrs->{group_by}) {
1431 my @current_group_by = map
1432 { $_ =~ /\./ ? $_ : "$attrs->{alias}.$_" }
1437 join ("\x00", sort @current_group_by)
1439 join ("\x00", sort @{$attrs->{columns}} )
1441 $self->throw_exception (
1442 "You have just attempted a $op operation on a resultset which does group_by"
1443 . ' on columns other than the primary keys, while DBIC internally needs to retrieve'
1444 . ' the primary keys in a subselect. All sane RDBMS engines do not support this'
1445 . ' kind of queries. Please retry the operation with a modified group_by or'
1446 . ' without using one at all.'
1451 $attrs->{group_by} = $attrs->{columns};
1455 my $subrs = (ref $self)->new($rsrc, $attrs);
1457 return $self->result_source->storage->_subq_update_delete($subrs, $op, $values);
1460 return $rsrc->storage->$op(
1462 $op eq 'update' ? $values : (),
1472 =item Arguments: \%values
1474 =item Return Value: $storage_rv
1478 Sets the specified columns in the resultset to the supplied values in a
1479 single query. Return value will be true if the update succeeded or false
1480 if no records were updated; exact type of success value is storage-dependent.
1485 my ($self, $values) = @_;
1486 $self->throw_exception('Values for update must be a hash')
1487 unless ref $values eq 'HASH';
1489 return $self->_rs_update_delete ('update', $values);
1496 =item Arguments: \%values
1498 =item Return Value: 1
1502 Fetches all objects and updates them one at a time. Note that C<update_all>
1503 will run DBIC cascade triggers, while L</update> will not.
1508 my ($self, $values) = @_;
1509 $self->throw_exception('Values for update_all must be a hash')
1510 unless ref $values eq 'HASH';
1511 foreach my $obj ($self->all) {
1512 $obj->set_columns($values)->update;
1521 =item Arguments: none
1523 =item Return Value: $storage_rv
1527 Deletes the contents of the resultset from its result source. Note that this
1528 will not run DBIC cascade triggers. See L</delete_all> if you need triggers
1529 to run. See also L<DBIx::Class::Row/delete>.
1531 Return value will be the amount of rows deleted; exact type of return value
1532 is storage-dependent.
1538 $self->throw_exception('delete does not accept any arguments')
1541 return $self->_rs_update_delete ('delete');
1548 =item Arguments: none
1550 =item Return Value: 1
1554 Fetches all objects and deletes them one at a time. Note that C<delete_all>
1555 will run DBIC cascade triggers, while L</delete> will not.
1561 $self->throw_exception('delete_all does not accept any arguments')
1564 $_->delete for $self->all;
1572 =item Arguments: \@data;
1576 Accepts either an arrayref of hashrefs or alternatively an arrayref of arrayrefs.
1577 For the arrayref of hashrefs style each hashref should be a structure suitable
1578 forsubmitting to a $resultset->create(...) method.
1580 In void context, C<insert_bulk> in L<DBIx::Class::Storage::DBI> is used
1581 to insert the data, as this is a faster method.
1583 Otherwise, each set of data is inserted into the database using
1584 L<DBIx::Class::ResultSet/create>, and the resulting objects are
1585 accumulated into an array. The array itself, or an array reference
1586 is returned depending on scalar or list context.
1588 Example: Assuming an Artist Class that has many CDs Classes relating:
1590 my $Artist_rs = $schema->resultset("Artist");
1592 ## Void Context Example
1593 $Artist_rs->populate([
1594 { artistid => 4, name => 'Manufactured Crap', cds => [
1595 { title => 'My First CD', year => 2006 },
1596 { title => 'Yet More Tweeny-Pop crap', year => 2007 },
1599 { artistid => 5, name => 'Angsty-Whiny Girl', cds => [
1600 { title => 'My parents sold me to a record company' ,year => 2005 },
1601 { title => 'Why Am I So Ugly?', year => 2006 },
1602 { title => 'I Got Surgery and am now Popular', year => 2007 }
1607 ## Array Context Example
1608 my ($ArtistOne, $ArtistTwo, $ArtistThree) = $Artist_rs->populate([
1609 { name => "Artist One"},
1610 { name => "Artist Two"},
1611 { name => "Artist Three", cds=> [
1612 { title => "First CD", year => 2007},
1613 { title => "Second CD", year => 2008},
1617 print $ArtistOne->name; ## response is 'Artist One'
1618 print $ArtistThree->cds->count ## reponse is '2'
1620 For the arrayref of arrayrefs style, the first element should be a list of the
1621 fieldsnames to which the remaining elements are rows being inserted. For
1624 $Arstist_rs->populate([
1625 [qw/artistid name/],
1626 [100, 'A Formally Unknown Singer'],
1627 [101, 'A singer that jumped the shark two albums ago'],
1628 [102, 'An actually cool singer.'],
1631 Please note an important effect on your data when choosing between void and
1632 wantarray context. Since void context goes straight to C<insert_bulk> in
1633 L<DBIx::Class::Storage::DBI> this will skip any component that is overriding
1634 C<insert>. So if you are using something like L<DBIx-Class-UUIDColumns> to
1635 create primary keys for you, you will find that your PKs are empty. In this
1636 case you will have to use the wantarray context in order to create those
1644 # cruft placed in standalone method
1645 my $data = $self->_normalize_populate_args(@_);
1647 if(defined wantarray) {
1649 foreach my $item (@$data) {
1650 push(@created, $self->create($item));
1652 return wantarray ? @created : \@created;
1654 my $first = $data->[0];
1656 # if a column is a registered relationship, and is a non-blessed hash/array, consider
1657 # it relationship data
1658 my (@rels, @columns);
1659 for (keys %$first) {
1660 my $ref = ref $first->{$_};
1661 $self->result_source->has_relationship($_) && ($ref eq 'ARRAY' or $ref eq 'HASH')
1667 my @pks = $self->result_source->primary_columns;
1669 ## do the belongs_to relationships
1670 foreach my $index (0..$#$data) {
1672 # delegate to create() for any dataset without primary keys with specified relationships
1673 if (grep { !defined $data->[$index]->{$_} } @pks ) {
1675 if (grep { ref $data->[$index]{$r} eq $_ } qw/HASH ARRAY/) { # a related set must be a HASH or AoH
1676 my @ret = $self->populate($data);
1682 foreach my $rel (@rels) {
1683 next unless ref $data->[$index]->{$rel} eq "HASH";
1684 my $result = $self->related_resultset($rel)->create($data->[$index]->{$rel});
1685 my ($reverse) = keys %{$self->result_source->reverse_relationship_info($rel)};
1686 my $related = $result->result_source->_resolve_condition(
1687 $result->result_source->relationship_info($reverse)->{cond},
1692 delete $data->[$index]->{$rel};
1693 $data->[$index] = {%{$data->[$index]}, %$related};
1695 push @columns, keys %$related if $index == 0;
1699 ## inherit the data locked in the conditions of the resultset
1700 my ($rs_data) = $self->_merge_cond_with_data({});
1701 delete @{$rs_data}{@columns};
1702 my @inherit_cols = keys %$rs_data;
1703 my @inherit_data = values %$rs_data;
1705 ## do bulk insert on current row
1706 $self->result_source->storage->insert_bulk(
1707 $self->result_source,
1708 [@columns, @inherit_cols],
1709 [ map { [ @$_{@columns}, @inherit_data ] } @$data ],
1712 ## do the has_many relationships
1713 foreach my $item (@$data) {
1715 foreach my $rel (@rels) {
1716 next unless $item->{$rel} && ref $item->{$rel} eq "ARRAY";
1718 my $parent = $self->find({map { $_ => $item->{$_} } @pks})
1719 || $self->throw_exception('Cannot find the relating object.');
1721 my $child = $parent->$rel;
1723 my $related = $child->result_source->_resolve_condition(
1724 $parent->result_source->relationship_info($rel)->{cond},
1729 my @rows_to_add = ref $item->{$rel} eq 'ARRAY' ? @{$item->{$rel}} : ($item->{$rel});
1730 my @populate = map { {%$_, %$related} } @rows_to_add;
1732 $child->populate( \@populate );
1739 # populate() argumnets went over several incarnations
1740 # What we ultimately support is AoH
1741 sub _normalize_populate_args {
1742 my ($self, $arg) = @_;
1744 if (ref $arg eq 'ARRAY') {
1745 if (ref $arg->[0] eq 'HASH') {
1748 elsif (ref $arg->[0] eq 'ARRAY') {
1750 my @colnames = @{$arg->[0]};
1751 foreach my $values (@{$arg}[1 .. $#$arg]) {
1752 push @ret, { map { $colnames[$_] => $values->[$_] } (0 .. $#colnames) };
1758 $self->throw_exception('Populate expects an arrayref of hashrefs or arrayref of arrayrefs');
1765 =item Arguments: none
1767 =item Return Value: $pager
1771 Return Value a L<Data::Page> object for the current resultset. Only makes
1772 sense for queries with a C<page> attribute.
1774 To get the full count of entries for a paged resultset, call
1775 C<total_entries> on the L<Data::Page> object.
1782 return $self->{pager} if $self->{pager};
1784 my $attrs = $self->{attrs};
1785 $self->throw_exception("Can't create pager for non-paged rs")
1786 unless $self->{attrs}{page};
1787 $attrs->{rows} ||= 10;
1789 # throw away the paging flags and re-run the count (possibly
1790 # with a subselect) to get the real total count
1791 my $count_attrs = { %$attrs };
1792 delete $count_attrs->{$_} for qw/rows offset page pager/;
1793 my $total_count = (ref $self)->new($self->result_source, $count_attrs)->count;
1795 return $self->{pager} = Data::Page->new(
1798 $self->{attrs}{page}
1806 =item Arguments: $page_number
1808 =item Return Value: $rs
1812 Returns a resultset for the $page_number page of the resultset on which page
1813 is called, where each page contains a number of rows equal to the 'rows'
1814 attribute set on the resultset (10 by default).
1819 my ($self, $page) = @_;
1820 return (ref $self)->new($self->result_source, { %{$self->{attrs}}, page => $page });
1827 =item Arguments: \%vals
1829 =item Return Value: $rowobject
1833 Creates a new row object in the resultset's result class and returns
1834 it. The row is not inserted into the database at this point, call
1835 L<DBIx::Class::Row/insert> to do that. Calling L<DBIx::Class::Row/in_storage>
1836 will tell you whether the row object has been inserted or not.
1838 Passes the hashref of input on to L<DBIx::Class::Row/new>.
1843 my ($self, $values) = @_;
1844 $self->throw_exception( "new_result needs a hash" )
1845 unless (ref $values eq 'HASH');
1847 my ($merged_cond, $cols_from_relations) = $self->_merge_cond_with_data($values);
1851 @$cols_from_relations
1852 ? (-cols_from_relations => $cols_from_relations)
1854 -source_handle => $self->_source_handle,
1855 -result_source => $self->result_source, # DO NOT REMOVE THIS, REQUIRED
1858 return $self->result_class->new(\%new);
1861 # _merge_cond_with_data
1863 # Takes a simple hash of K/V data and returns its copy merged with the
1864 # condition already present on the resultset. Additionally returns an
1865 # arrayref of value/condition names, which were inferred from related
1866 # objects (this is needed for in-memory related objects)
1867 sub _merge_cond_with_data {
1868 my ($self, $data) = @_;
1870 my (%new_data, @cols_from_relations);
1872 my $alias = $self->{attrs}{alias};
1874 if (! defined $self->{cond}) {
1875 # just massage $data below
1877 elsif ($self->{cond} eq $DBIx::Class::ResultSource::UNRESOLVABLE_CONDITION) {
1878 %new_data = %{ $self->{attrs}{related_objects} || {} }; # nothing might have been inserted yet
1879 @cols_from_relations = keys %new_data;
1881 elsif (ref $self->{cond} ne 'HASH') {
1882 $self->throw_exception(
1883 "Can't abstract implicit construct, resultset condition not a hash"
1887 # precendence must be given to passed values over values inherited from
1888 # the cond, so the order here is important.
1889 my $collapsed_cond = $self->_collapse_cond($self->{cond});
1890 my %implied = %{$self->_remove_alias($collapsed_cond, $alias)};
1892 while ( my($col, $value) = each %implied ) {
1893 if (ref($value) eq 'HASH' && keys(%$value) && (keys %$value)[0] eq '=') {
1894 $new_data{$col} = $value->{'='};
1897 $new_data{$col} = $value if $self->_is_deterministic_value($value);
1903 %{ $self->_remove_alias($data, $alias) },
1906 return (\%new_data, \@cols_from_relations);
1909 # _is_deterministic_value
1911 # Make an effor to strip non-deterministic values from the condition,
1912 # to make sure new_result chokes less
1914 sub _is_deterministic_value {
1917 my $ref_type = ref $value;
1918 return 1 if $ref_type eq '' || $ref_type eq 'SCALAR';
1919 return 1 if Scalar::Util::blessed($value);
1923 # _has_resolved_attr
1925 # determines if the resultset defines at least one
1926 # of the attributes supplied
1928 # used to determine if a subquery is neccessary
1930 # supports some virtual attributes:
1932 # This will scan for any joins being present on the resultset.
1933 # It is not a mere key-search but a deep inspection of {from}
1936 sub _has_resolved_attr {
1937 my ($self, @attr_names) = @_;
1939 my $attrs = $self->_resolved_attrs;
1943 for my $n (@attr_names) {
1944 if (grep { $n eq $_ } (qw/-join/) ) {
1945 $extra_checks{$n}++;
1949 my $attr = $attrs->{$n};
1951 next if not defined $attr;
1953 if (ref $attr eq 'HASH') {
1954 return 1 if keys %$attr;
1956 elsif (ref $attr eq 'ARRAY') {
1964 # a resolved join is expressed as a multi-level from
1966 $extra_checks{-join}
1968 ref $attrs->{from} eq 'ARRAY'
1970 @{$attrs->{from}} > 1
1978 # Recursively collapse the condition.
1980 sub _collapse_cond {
1981 my ($self, $cond, $collapsed) = @_;
1985 if (ref $cond eq 'ARRAY') {
1986 foreach my $subcond (@$cond) {
1987 next unless ref $subcond; # -or
1988 $collapsed = $self->_collapse_cond($subcond, $collapsed);
1991 elsif (ref $cond eq 'HASH') {
1992 if (keys %$cond and (keys %$cond)[0] eq '-and') {
1993 foreach my $subcond (@{$cond->{-and}}) {
1994 $collapsed = $self->_collapse_cond($subcond, $collapsed);
1998 foreach my $col (keys %$cond) {
1999 my $value = $cond->{$col};
2000 $collapsed->{$col} = $value;
2010 # Remove the specified alias from the specified query hash. A copy is made so
2011 # the original query is not modified.
2014 my ($self, $query, $alias) = @_;
2016 my %orig = %{ $query || {} };
2019 foreach my $key (keys %orig) {
2021 $unaliased{$key} = $orig{$key};
2024 $unaliased{$1} = $orig{$key}
2025 if $key =~ m/^(?:\Q$alias\E\.)?([^.]+)$/;
2035 =item Arguments: none
2037 =item Return Value: \[ $sql, @bind ]
2041 Returns the SQL query and bind vars associated with the invocant.
2043 This is generally used as the RHS for a subquery.
2050 my $attrs = $self->_resolved_attrs_copy;
2055 # my ($sql, \@bind, \%dbi_bind_attrs) = _select_args_to_query (...)
2056 # $sql also has no wrapping parenthesis in list ctx
2058 my $sqlbind = $self->result_source->storage
2059 ->_select_args_to_query ($attrs->{from}, $attrs->{select}, $attrs->{where}, $attrs);
2068 =item Arguments: \%vals, \%attrs?
2070 =item Return Value: $rowobject
2074 my $artist = $schema->resultset('Artist')->find_or_new(
2075 { artist => 'fred' }, { key => 'artists' });
2077 $cd->cd_to_producer->find_or_new({ producer => $producer },
2078 { key => 'primary });
2080 Find an existing record from this resultset, based on its primary
2081 key, or a unique constraint. If none exists, instantiate a new result
2082 object and return it. The object will not be saved into your storage
2083 until you call L<DBIx::Class::Row/insert> on it.
2085 You most likely want this method when looking for existing rows using
2086 a unique constraint that is not the primary key, or looking for
2089 If you want objects to be saved immediately, use L</find_or_create>
2092 B<Note>: Take care when using C<find_or_new> with a table having
2093 columns with default values that you intend to be automatically
2094 supplied by the database (e.g. an auto_increment primary key column).
2095 In normal usage, the value of such columns should NOT be included at
2096 all in the call to C<find_or_new>, even when set to C<undef>.
2102 my $attrs = (@_ > 1 && ref $_[$#_] eq 'HASH' ? pop(@_) : {});
2103 my $hash = ref $_[0] eq 'HASH' ? shift : {@_};
2104 if (keys %$hash and my $row = $self->find($hash, $attrs) ) {
2107 return $self->new_result($hash);
2114 =item Arguments: \%vals
2116 =item Return Value: a L<DBIx::Class::Row> $object
2120 Attempt to create a single new row or a row with multiple related rows
2121 in the table represented by the resultset (and related tables). This
2122 will not check for duplicate rows before inserting, use
2123 L</find_or_create> to do that.
2125 To create one row for this resultset, pass a hashref of key/value
2126 pairs representing the columns of the table and the values you wish to
2127 store. If the appropriate relationships are set up, foreign key fields
2128 can also be passed an object representing the foreign row, and the
2129 value will be set to its primary key.
2131 To create related objects, pass a hashref of related-object column values
2132 B<keyed on the relationship name>. If the relationship is of type C<multi>
2133 (L<DBIx::Class::Relationship/has_many>) - pass an arrayref of hashrefs.
2134 The process will correctly identify columns holding foreign keys, and will
2135 transparrently populate them from the keys of the corresponding relation.
2136 This can be applied recursively, and will work correctly for a structure
2137 with an arbitrary depth and width, as long as the relationships actually
2138 exists and the correct column data has been supplied.
2141 Instead of hashrefs of plain related data (key/value pairs), you may
2142 also pass new or inserted objects. New objects (not inserted yet, see
2143 L</new>), will be inserted into their appropriate tables.
2145 Effectively a shortcut for C<< ->new_result(\%vals)->insert >>.
2147 Example of creating a new row.
2149 $person_rs->create({
2150 name=>"Some Person",
2151 email=>"somebody@someplace.com"
2154 Example of creating a new row and also creating rows in a related C<has_many>
2155 or C<has_one> resultset. Note Arrayref.
2158 { artistid => 4, name => 'Manufactured Crap', cds => [
2159 { title => 'My First CD', year => 2006 },
2160 { title => 'Yet More Tweeny-Pop crap', year => 2007 },
2165 Example of creating a new row and also creating a row in a related
2166 C<belongs_to>resultset. Note Hashref.
2169 title=>"Music for Silly Walks",
2172 name=>"Silly Musician",
2180 When subclassing ResultSet never attempt to override this method. Since
2181 it is a simple shortcut for C<< $self->new_result($attrs)->insert >>, a
2182 lot of the internals simply never call it, so your override will be
2183 bypassed more often than not. Override either L<new|DBIx::Class::Row/new>
2184 or L<insert|DBIx::Class::Row/insert> depending on how early in the
2185 L</create> process you need to intervene.
2192 my ($self, $attrs) = @_;
2193 $self->throw_exception( "create needs a hashref" )
2194 unless ref $attrs eq 'HASH';
2195 return $self->new_result($attrs)->insert;
2198 =head2 find_or_create
2202 =item Arguments: \%vals, \%attrs?
2204 =item Return Value: $rowobject
2208 $cd->cd_to_producer->find_or_create({ producer => $producer },
2209 { key => 'primary' });
2211 Tries to find a record based on its primary key or unique constraints; if none
2212 is found, creates one and returns that instead.
2214 my $cd = $schema->resultset('CD')->find_or_create({
2216 artist => 'Massive Attack',
2217 title => 'Mezzanine',
2221 Also takes an optional C<key> attribute, to search by a specific key or unique
2222 constraint. For example:
2224 my $cd = $schema->resultset('CD')->find_or_create(
2226 artist => 'Massive Attack',
2227 title => 'Mezzanine',
2229 { key => 'cd_artist_title' }
2232 B<Note>: Because find_or_create() reads from the database and then
2233 possibly inserts based on the result, this method is subject to a race
2234 condition. Another process could create a record in the table after
2235 the find has completed and before the create has started. To avoid
2236 this problem, use find_or_create() inside a transaction.
2238 B<Note>: Take care when using C<find_or_create> with a table having
2239 columns with default values that you intend to be automatically
2240 supplied by the database (e.g. an auto_increment primary key column).
2241 In normal usage, the value of such columns should NOT be included at
2242 all in the call to C<find_or_create>, even when set to C<undef>.
2244 See also L</find> and L</update_or_create>. For information on how to declare
2245 unique constraints, see L<DBIx::Class::ResultSource/add_unique_constraint>.
2249 sub find_or_create {
2251 my $attrs = (@_ > 1 && ref $_[$#_] eq 'HASH' ? pop(@_) : {});
2252 my $hash = ref $_[0] eq 'HASH' ? shift : {@_};
2253 if (keys %$hash and my $row = $self->find($hash, $attrs) ) {
2256 return $self->create($hash);
2259 =head2 update_or_create
2263 =item Arguments: \%col_values, { key => $unique_constraint }?
2265 =item Return Value: $rowobject
2269 $resultset->update_or_create({ col => $val, ... });
2271 First, searches for an existing row matching one of the unique constraints
2272 (including the primary key) on the source of this resultset. If a row is
2273 found, updates it with the other given column values. Otherwise, creates a new
2276 Takes an optional C<key> attribute to search on a specific unique constraint.
2279 # In your application
2280 my $cd = $schema->resultset('CD')->update_or_create(
2282 artist => 'Massive Attack',
2283 title => 'Mezzanine',
2286 { key => 'cd_artist_title' }
2289 $cd->cd_to_producer->update_or_create({
2290 producer => $producer,
2297 If no C<key> is specified, it searches on all unique constraints defined on the
2298 source, including the primary key.
2300 If the C<key> is specified as C<primary>, it searches only on the primary key.
2302 See also L</find> and L</find_or_create>. For information on how to declare
2303 unique constraints, see L<DBIx::Class::ResultSource/add_unique_constraint>.
2305 B<Note>: Take care when using C<update_or_create> with a table having
2306 columns with default values that you intend to be automatically
2307 supplied by the database (e.g. an auto_increment primary key column).
2308 In normal usage, the value of such columns should NOT be included at
2309 all in the call to C<update_or_create>, even when set to C<undef>.
2313 sub update_or_create {
2315 my $attrs = (@_ > 1 && ref $_[$#_] eq 'HASH' ? pop(@_) : {});
2316 my $cond = ref $_[0] eq 'HASH' ? shift : {@_};
2318 my $row = $self->find($cond, $attrs);
2320 $row->update($cond);
2324 return $self->create($cond);
2327 =head2 update_or_new
2331 =item Arguments: \%col_values, { key => $unique_constraint }?
2333 =item Return Value: $rowobject
2337 $resultset->update_or_new({ col => $val, ... });
2339 First, searches for an existing row matching one of the unique constraints
2340 (including the primary key) on the source of this resultset. If a row is
2341 found, updates it with the other given column values. Otherwise, instantiate
2342 a new result object and return it. The object will not be saved into your storage
2343 until you call L<DBIx::Class::Row/insert> on it.
2345 Takes an optional C<key> attribute to search on a specific unique constraint.
2348 # In your application
2349 my $cd = $schema->resultset('CD')->update_or_new(
2351 artist => 'Massive Attack',
2352 title => 'Mezzanine',
2355 { key => 'cd_artist_title' }
2358 if ($cd->in_storage) {
2359 # the cd was updated
2362 # the cd is not yet in the database, let's insert it
2366 B<Note>: Take care when using C<update_or_new> with a table having
2367 columns with default values that you intend to be automatically
2368 supplied by the database (e.g. an auto_increment primary key column).
2369 In normal usage, the value of such columns should NOT be included at
2370 all in the call to C<update_or_new>, even when set to C<undef>.
2372 See also L</find>, L</find_or_create> and L</find_or_new>.
2378 my $attrs = ( @_ > 1 && ref $_[$#_] eq 'HASH' ? pop(@_) : {} );
2379 my $cond = ref $_[0] eq 'HASH' ? shift : {@_};
2381 my $row = $self->find( $cond, $attrs );
2382 if ( defined $row ) {
2383 $row->update($cond);
2387 return $self->new_result($cond);
2394 =item Arguments: none
2396 =item Return Value: \@cache_objects?
2400 Gets the contents of the cache for the resultset, if the cache is set.
2402 The cache is populated either by using the L</prefetch> attribute to
2403 L</search> or by calling L</set_cache>.
2415 =item Arguments: \@cache_objects
2417 =item Return Value: \@cache_objects
2421 Sets the contents of the cache for the resultset. Expects an arrayref
2422 of objects of the same class as those produced by the resultset. Note that
2423 if the cache is set the resultset will return the cached objects rather
2424 than re-querying the database even if the cache attr is not set.
2426 The contents of the cache can also be populated by using the
2427 L</prefetch> attribute to L</search>.
2432 my ( $self, $data ) = @_;
2433 $self->throw_exception("set_cache requires an arrayref")
2434 if defined($data) && (ref $data ne 'ARRAY');
2435 $self->{all_cache} = $data;
2442 =item Arguments: none
2444 =item Return Value: []
2448 Clears the cache for the resultset.
2453 shift->set_cache(undef);
2460 =item Arguments: none
2462 =item Return Value: true, if the resultset has been paginated
2470 return !!$self->{attrs}{page};
2473 =head2 related_resultset
2477 =item Arguments: $relationship_name
2479 =item Return Value: $resultset
2483 Returns a related resultset for the supplied relationship name.
2485 $artist_rs = $schema->resultset('CD')->related_resultset('Artist');
2489 sub related_resultset {
2490 my ($self, $rel) = @_;
2492 $self->{related_resultsets} ||= {};
2493 return $self->{related_resultsets}{$rel} ||= do {
2494 my $rsrc = $self->result_source;
2495 my $rel_info = $rsrc->relationship_info($rel);
2497 $self->throw_exception(
2498 "search_related: result source '" . $rsrc->source_name .
2499 "' has no such relationship $rel")
2502 my $attrs = $self->_chain_relationship($rel);
2504 my $join_count = $attrs->{seen_join}{$rel};
2506 my $alias = $self->result_source->storage
2507 ->relname_to_table_alias($rel, $join_count);
2509 # since this is search_related, and we already slid the select window inwards
2510 # (the select/as attrs were deleted in the beginning), we need to flip all
2511 # left joins to inner, so we get the expected results
2512 # read the comment on top of the actual function to see what this does
2513 $attrs->{from} = $rsrc->schema->storage->_straight_join_to_node ($attrs->{from}, $alias);
2516 #XXX - temp fix for result_class bug. There likely is a more elegant fix -groditi
2517 delete @{$attrs}{qw(result_class alias)};
2521 if (my $cache = $self->get_cache) {
2522 if ($cache->[0] && $cache->[0]->related_resultset($rel)->get_cache) {
2523 $new_cache = [ map { @{$_->related_resultset($rel)->get_cache} }
2528 my $rel_source = $rsrc->related_source($rel);
2532 # The reason we do this now instead of passing the alias to the
2533 # search_rs below is that if you wrap/overload resultset on the
2534 # source you need to know what alias it's -going- to have for things
2535 # to work sanely (e.g. RestrictWithObject wants to be able to add
2536 # extra query restrictions, and these may need to be $alias.)
2538 my $rel_attrs = $rel_source->resultset_attributes;
2539 local $rel_attrs->{alias} = $alias;
2541 $rel_source->resultset
2545 where => $attrs->{where},
2548 $new->set_cache($new_cache) if $new_cache;
2553 =head2 current_source_alias
2557 =item Arguments: none
2559 =item Return Value: $source_alias
2563 Returns the current table alias for the result source this resultset is built
2564 on, that will be used in the SQL query. Usually it is C<me>.
2566 Currently the source alias that refers to the result set returned by a
2567 L</search>/L</find> family method depends on how you got to the resultset: it's
2568 C<me> by default, but eg. L</search_related> aliases it to the related result
2569 source name (and keeps C<me> referring to the original result set). The long
2570 term goal is to make L<DBIx::Class> always alias the current resultset as C<me>
2571 (and make this method unnecessary).
2573 Thus it's currently necessary to use this method in predefined queries (see
2574 L<DBIx::Class::Manual::Cookbook/Predefined searches>) when referring to the
2575 source alias of the current result set:
2577 # in a result set class
2579 my ($self, $user) = @_;
2581 my $me = $self->current_source_alias;
2583 return $self->search(
2584 "$me.modified" => $user->id,
2590 sub current_source_alias {
2593 return ($self->{attrs} || {})->{alias} || 'me';
2596 =head2 as_subselect_rs
2600 =item Arguments: none
2602 =item Return Value: $resultset
2606 Act as a barrier to SQL symbols. The resultset provided will be made into a
2607 "virtual view" by including it as a subquery within the from clause. From this
2608 point on, any joined tables are inaccessible to ->search on the resultset (as if
2609 it were simply where-filtered without joins). For example:
2611 my $rs = $schema->resultset('Bar')->search({'x.name' => 'abc'},{ join => 'x' });
2613 # 'x' now pollutes the query namespace
2615 # So the following works as expected
2616 my $ok_rs = $rs->search({'x.other' => 1});
2618 # But this doesn't: instead of finding a 'Bar' related to two x rows (abc and
2619 # def) we look for one row with contradictory terms and join in another table
2620 # (aliased 'x_2') which we never use
2621 my $broken_rs = $rs->search({'x.name' => 'def'});
2623 my $rs2 = $rs->as_subselect_rs;
2625 # doesn't work - 'x' is no longer accessible in $rs2, having been sealed away
2626 my $not_joined_rs = $rs2->search({'x.other' => 1});
2628 # works as expected: finds a 'table' row related to two x rows (abc and def)
2629 my $correctly_joined_rs = $rs2->search({'x.name' => 'def'});
2631 Another example of when one might use this would be to select a subset of
2632 columns in a group by clause:
2634 my $rs = $schema->resultset('Bar')->search(undef, {
2635 group_by => [qw{ id foo_id baz_id }],
2636 })->as_subselect_rs->search(undef, {
2637 columns => [qw{ id foo_id }]
2640 In the above example normally columns would have to be equal to the group by,
2641 but because we isolated the group by into a subselect the above works.
2645 sub as_subselect_rs {
2648 return $self->result_source->resultset->search( undef, {
2649 alias => $self->current_source_alias,
2651 $self->current_source_alias => $self->as_query,
2652 -alias => $self->current_source_alias,
2653 -source_handle => $self->result_source->handle,
2658 # This code is called by search_related, and makes sure there
2659 # is clear separation between the joins before, during, and
2660 # after the relationship. This information is needed later
2661 # in order to properly resolve prefetch aliases (any alias
2662 # with a relation_chain_depth less than the depth of the
2663 # current prefetch is not considered)
2665 # The increments happen twice per join. An even number means a
2666 # relationship specified via a search_related, whereas an odd
2667 # number indicates a join/prefetch added via attributes
2669 # Also this code will wrap the current resultset (the one we
2670 # chain to) in a subselect IFF it contains limiting attributes
2671 sub _chain_relationship {
2672 my ($self, $rel) = @_;
2673 my $source = $self->result_source;
2674 my $attrs = { %{$self->{attrs}||{}} };
2676 # we need to take the prefetch the attrs into account before we
2677 # ->_resolve_join as otherwise they get lost - captainL
2678 my $join = $self->_merge_attr( $attrs->{join}, $attrs->{prefetch} );
2680 delete @{$attrs}{qw/join prefetch collapse distinct select as columns +select +as +columns/};
2682 my $seen = { %{ (delete $attrs->{seen_join}) || {} } };
2685 my @force_subq_attrs = qw/offset rows group_by having/;
2688 ($attrs->{from} && ref $attrs->{from} ne 'ARRAY')
2690 $self->_has_resolved_attr (@force_subq_attrs)
2692 # Nuke the prefetch (if any) before the new $rs attrs
2693 # are resolved (prefetch is useless - we are wrapping
2694 # a subquery anyway).
2695 my $rs_copy = $self->search;
2696 $rs_copy->{attrs}{join} = $self->_merge_attr (
2697 $rs_copy->{attrs}{join},
2698 delete $rs_copy->{attrs}{prefetch},
2702 -source_handle => $source->handle,
2703 -alias => $attrs->{alias},
2704 $attrs->{alias} => $rs_copy->as_query,
2706 delete @{$attrs}{@force_subq_attrs, 'where'};
2707 $seen->{-relation_chain_depth} = 0;
2709 elsif ($attrs->{from}) { #shallow copy suffices
2710 $from = [ @{$attrs->{from}} ];
2714 -source_handle => $source->handle,
2715 -alias => $attrs->{alias},
2716 $attrs->{alias} => $source->from,
2720 my $jpath = ($seen->{-relation_chain_depth})
2721 ? $from->[-1][0]{-join_path}
2724 my @requested_joins = $source->_resolve_join(
2731 push @$from, @requested_joins;
2733 $seen->{-relation_chain_depth}++;
2735 # if $self already had a join/prefetch specified on it, the requested
2736 # $rel might very well be already included. What we do in this case
2737 # is effectively a no-op (except that we bump up the chain_depth on
2738 # the join in question so we could tell it *is* the search_related)
2741 # we consider the last one thus reverse
2742 for my $j (reverse @requested_joins) {
2743 my ($last_j) = keys %{$j->[0]{-join_path}[-1]};
2744 if ($rel eq $last_j) {
2745 $j->[0]{-relation_chain_depth}++;
2751 unless ($already_joined) {
2752 push @$from, $source->_resolve_join(
2760 $seen->{-relation_chain_depth}++;
2762 return {%$attrs, from => $from, seen_join => $seen};
2765 # too many times we have to do $attrs = { %{$self->_resolved_attrs} }
2766 sub _resolved_attrs_copy {
2768 return { %{$self->_resolved_attrs (@_)} };
2771 sub _resolved_attrs {
2773 return $self->{_attrs} if $self->{_attrs};
2775 my $attrs = { %{ $self->{attrs} || {} } };
2776 my $source = $self->result_source;
2777 my $alias = $attrs->{alias};
2779 $attrs->{columns} ||= delete $attrs->{cols} if exists $attrs->{cols};
2782 # build columns (as long as select isn't set) into a set of as/select hashes
2783 unless ( $attrs->{select} ) {
2786 if ( ref $attrs->{columns} eq 'ARRAY' ) {
2787 @cols = @{ delete $attrs->{columns}}
2788 } elsif ( defined $attrs->{columns} ) {
2789 @cols = delete $attrs->{columns}
2791 @cols = $source->columns
2795 if ( ref $_ eq 'HASH' ) {
2798 my $key = /^\Q${alias}.\E(.+)$/
2804 push @colbits, { $key => $value };
2809 # add the additional columns on
2810 foreach (qw{include_columns +columns}) {
2811 if ( $attrs->{$_} ) {
2812 my @list = ( ref($attrs->{$_}) eq 'ARRAY' )
2813 ? @{ delete $attrs->{$_} }
2814 : delete $attrs->{$_};
2816 if ( ref($_) eq 'HASH' ) {
2819 my $key = ( split /\./, $_ )[-1];
2820 my $value = ( /\./ ? $_ : "$alias.$_" );
2821 push @colbits, { $key => $value };
2827 # start with initial select items
2828 if ( $attrs->{select} ) {
2830 ( ref $attrs->{select} eq 'ARRAY' )
2831 ? [ @{ $attrs->{select} } ]
2832 : [ $attrs->{select} ];
2834 if ( $attrs->{as} ) {
2837 ref $attrs->{as} eq 'ARRAY'
2838 ? [ @{ $attrs->{as} } ]
2842 $attrs->{as} = [ map {
2843 m/^\Q${alias}.\E(.+)$/
2846 } @{ $attrs->{select} }
2852 # otherwise we intialise select & as to empty
2853 $attrs->{select} = [];
2857 # now add colbits to select/as
2858 push @{ $attrs->{select} }, map values %{$_}, @colbits;
2859 push @{ $attrs->{as} }, map keys %{$_}, @colbits;
2861 if ( my $adds = delete $attrs->{'+select'} ) {
2862 $adds = [$adds] unless ref $adds eq 'ARRAY';
2863 push @{ $attrs->{select} },
2864 map { /\./ || ref $_ ? $_ : "$alias.$_" } @$adds;
2866 if ( my $adds = delete $attrs->{'+as'} ) {
2867 $adds = [$adds] unless ref $adds eq 'ARRAY';
2868 push @{ $attrs->{as} }, @$adds;
2871 $attrs->{from} ||= [{
2872 -source_handle => $source->handle,
2873 -alias => $self->{attrs}{alias},
2874 $self->{attrs}{alias} => $source->from,
2877 if ( $attrs->{join} || $attrs->{prefetch} ) {
2879 $self->throw_exception ('join/prefetch can not be used with a custom {from}')
2880 if ref $attrs->{from} ne 'ARRAY';
2882 my $join = delete $attrs->{join} || {};
2884 if ( defined $attrs->{prefetch} ) {
2885 $join = $self->_merge_attr( $join, $attrs->{prefetch} );
2888 $attrs->{from} = # have to copy here to avoid corrupting the original
2890 @{ $attrs->{from} },
2891 $source->_resolve_join(
2894 { %{ $attrs->{seen_join} || {} } },
2895 ( $attrs->{seen_join} && keys %{$attrs->{seen_join}})
2896 ? $attrs->{from}[-1][0]{-join_path}
2903 if ( defined $attrs->{order_by} ) {
2904 $attrs->{order_by} = (
2905 ref( $attrs->{order_by} ) eq 'ARRAY'
2906 ? [ @{ $attrs->{order_by} } ]
2907 : [ $attrs->{order_by} || () ]
2911 if ($attrs->{group_by} and ref $attrs->{group_by} ne 'ARRAY') {
2912 $attrs->{group_by} = [ $attrs->{group_by} ];
2915 # generate the distinct induced group_by early, as prefetch will be carried via a
2916 # subquery (since a group_by is present)
2917 if (delete $attrs->{distinct}) {
2918 if ($attrs->{group_by}) {
2919 carp ("Useless use of distinct on a grouped resultset ('distinct' is ignored when a 'group_by' is present)");
2922 $attrs->{group_by} = [ grep { !ref($_) || (ref($_) ne 'HASH') } @{$attrs->{select}} ];
2924 # add any order_by parts that are not already present in the group_by
2925 # we need to be careful not to add any named functions/aggregates
2926 # i.e. select => [ ... { count => 'foo', -as 'foocount' } ... ]
2927 my %already_grouped = map { $_ => 1 } (@{$attrs->{group_by}});
2929 my $storage = $self->result_source->schema->storage;
2931 my $rs_column_list = $storage->_resolve_column_info ($attrs->{from});
2933 for my $chunk ($storage->_parse_order_by($attrs->{order_by})) {
2934 if ($rs_column_list->{$chunk} && not $already_grouped{$chunk}++) {
2935 push @{$attrs->{group_by}}, $chunk;
2941 $attrs->{collapse} ||= {};
2942 if ( my $prefetch = delete $attrs->{prefetch} ) {
2943 $prefetch = $self->_merge_attr( {}, $prefetch );
2945 my $prefetch_ordering = [];
2947 # this is a separate structure (we don't look in {from} directly)
2948 # as the resolver needs to shift things off the lists to work
2949 # properly (identical-prefetches on different branches)
2951 if (ref $attrs->{from} eq 'ARRAY') {
2953 my $start_depth = $attrs->{seen_join}{-relation_chain_depth} || 0;
2955 for my $j ( @{$attrs->{from}}[1 .. $#{$attrs->{from}} ] ) {
2956 next unless $j->[0]{-alias};
2957 next unless $j->[0]{-join_path};
2958 next if ($j->[0]{-relation_chain_depth} || 0) < $start_depth;
2960 my @jpath = map { keys %$_ } @{$j->[0]{-join_path}};
2963 $p = $p->{$_} ||= {} for @jpath[ ($start_depth/2) .. $#jpath]; #only even depths are actual jpath boundaries
2964 push @{$p->{-join_aliases} }, $j->[0]{-alias};
2969 $source->_resolve_prefetch( $prefetch, $alias, $join_map, $prefetch_ordering, $attrs->{collapse} );
2971 # we need to somehow mark which columns came from prefetch
2972 $attrs->{_prefetch_select} = [ map { $_->[0] } @prefetch ];
2974 push @{ $attrs->{select} }, @{$attrs->{_prefetch_select}};
2975 push @{ $attrs->{as} }, (map { $_->[1] } @prefetch);
2977 push( @{$attrs->{order_by}}, @$prefetch_ordering );
2978 $attrs->{_collapse_order_by} = \@$prefetch_ordering;
2981 # if both page and offset are specified, produce a combined offset
2982 # even though it doesn't make much sense, this is what pre 081xx has
2984 if (my $page = delete $attrs->{page}) {
2986 ($attrs->{rows} * ($page - 1))
2988 ($attrs->{offset} || 0)
2992 return $self->{_attrs} = $attrs;
2996 my ($self, $attr) = @_;
2998 if (ref $attr eq 'HASH') {
2999 return $self->_rollout_hash($attr);
3000 } elsif (ref $attr eq 'ARRAY') {
3001 return $self->_rollout_array($attr);
3007 sub _rollout_array {
3008 my ($self, $attr) = @_;
3011 foreach my $element (@{$attr}) {
3012 if (ref $element eq 'HASH') {
3013 push( @rolled_array, @{ $self->_rollout_hash( $element ) } );
3014 } elsif (ref $element eq 'ARRAY') {
3015 # XXX - should probably recurse here
3016 push( @rolled_array, @{$self->_rollout_array($element)} );
3018 push( @rolled_array, $element );
3021 return \@rolled_array;
3025 my ($self, $attr) = @_;
3028 foreach my $key (keys %{$attr}) {
3029 push( @rolled_array, { $key => $attr->{$key} } );
3031 return \@rolled_array;
3034 sub _calculate_score {
3035 my ($self, $a, $b) = @_;
3037 if (defined $a xor defined $b) {
3040 elsif (not defined $a) {
3044 if (ref $b eq 'HASH') {
3045 my ($b_key) = keys %{$b};
3046 if (ref $a eq 'HASH') {
3047 my ($a_key) = keys %{$a};
3048 if ($a_key eq $b_key) {
3049 return (1 + $self->_calculate_score( $a->{$a_key}, $b->{$b_key} ));
3054 return ($a eq $b_key) ? 1 : 0;
3057 if (ref $a eq 'HASH') {
3058 my ($a_key) = keys %{$a};
3059 return ($b eq $a_key) ? 1 : 0;
3061 return ($b eq $a) ? 1 : 0;
3067 my ($self, $orig, $import) = @_;
3069 return $import unless defined($orig);
3070 return $orig unless defined($import);
3072 $orig = $self->_rollout_attr($orig);
3073 $import = $self->_rollout_attr($import);
3076 foreach my $import_element ( @{$import} ) {
3077 # find best candidate from $orig to merge $b_element into
3078 my $best_candidate = { position => undef, score => 0 }; my $position = 0;
3079 foreach my $orig_element ( @{$orig} ) {
3080 my $score = $self->_calculate_score( $orig_element, $import_element );
3081 if ($score > $best_candidate->{score}) {
3082 $best_candidate->{position} = $position;
3083 $best_candidate->{score} = $score;
3087 my ($import_key) = ( ref $import_element eq 'HASH' ) ? keys %{$import_element} : ($import_element);
3089 if ($best_candidate->{score} == 0 || exists $seen_keys->{$import_key}) {
3090 push( @{$orig}, $import_element );
3092 my $orig_best = $orig->[$best_candidate->{position}];
3093 # merge orig_best and b_element together and replace original with merged
3094 if (ref $orig_best ne 'HASH') {
3095 $orig->[$best_candidate->{position}] = $import_element;
3096 } elsif (ref $import_element eq 'HASH') {
3097 my ($key) = keys %{$orig_best};
3098 $orig->[$best_candidate->{position}] = { $key => $self->_merge_attr($orig_best->{$key}, $import_element->{$key}) };
3101 $seen_keys->{$import_key} = 1; # don't merge the same key twice
3111 $self->_source_handle($_[0]->handle);
3113 $self->_source_handle->resolve;
3117 =head2 throw_exception
3119 See L<DBIx::Class::Schema/throw_exception> for details.
3123 sub throw_exception {
3126 if (ref $self && $self->_source_handle->schema) {
3127 $self->_source_handle->schema->throw_exception(@_)
3130 DBIx::Class::Exception->throw(@_);
3134 # XXX: FIXME: Attributes docs need clearing up
3138 Attributes are used to refine a ResultSet in various ways when
3139 searching for data. They can be passed to any method which takes an
3140 C<\%attrs> argument. See L</search>, L</search_rs>, L</find>,
3143 These are in no particular order:
3149 =item Value: ( $order_by | \@order_by | \%order_by )
3153 Which column(s) to order the results by.
3155 [The full list of suitable values is documented in
3156 L<SQL::Abstract/"ORDER BY CLAUSES">; the following is a summary of
3159 If a single column name, or an arrayref of names is supplied, the
3160 argument is passed through directly to SQL. The hashref syntax allows
3161 for connection-agnostic specification of ordering direction:
3163 For descending order:
3165 order_by => { -desc => [qw/col1 col2 col3/] }
3167 For explicit ascending order:
3169 order_by => { -asc => 'col' }
3171 The old scalarref syntax (i.e. order_by => \'year DESC') is still
3172 supported, although you are strongly encouraged to use the hashref
3173 syntax as outlined above.
3179 =item Value: \@columns
3183 Shortcut to request a particular set of columns to be retrieved. Each
3184 column spec may be a string (a table column name), or a hash (in which
3185 case the key is the C<as> value, and the value is used as the C<select>
3186 expression). Adds C<me.> onto the start of any column without a C<.> in
3187 it and sets C<select> from that, then auto-populates C<as> from
3188 C<select> as normal. (You may also use the C<cols> attribute, as in
3189 earlier versions of DBIC.)
3195 =item Value: \@columns
3199 Indicates additional columns to be selected from storage. Works the same
3200 as L</columns> but adds columns to the selection. (You may also use the
3201 C<include_columns> attribute, as in earlier versions of DBIC). For
3204 $schema->resultset('CD')->search(undef, {
3205 '+columns' => ['artist.name'],
3209 would return all CDs and include a 'name' column to the information
3210 passed to object inflation. Note that the 'artist' is the name of the
3211 column (or relationship) accessor, and 'name' is the name of the column
3212 accessor in the related table.
3214 =head2 include_columns
3218 =item Value: \@columns
3222 Deprecated. Acts as a synonym for L</+columns> for backward compatibility.
3228 =item Value: \@select_columns
3232 Indicates which columns should be selected from the storage. You can use
3233 column names, or in the case of RDBMS back ends, function or stored procedure
3236 $rs = $schema->resultset('Employee')->search(undef, {
3239 { count => 'employeeid' },
3244 When you use function/stored procedure names and do not supply an C<as>
3245 attribute, the column names returned are storage-dependent. E.g. MySQL would
3246 return a column named C<count(employeeid)> in the above example.
3248 B<NOTE:> You will almost always need a corresponding 'as' entry when you use
3255 Indicates additional columns to be selected from storage. Works the same as
3256 L</select> but adds columns to the selection.
3264 Indicates additional column names for those added via L</+select>. See L</as>.
3272 =item Value: \@inflation_names
3276 Indicates column names for object inflation. That is, C<as>
3277 indicates the name that the column can be accessed as via the
3278 C<get_column> method (or via the object accessor, B<if one already
3279 exists>). It has nothing to do with the SQL code C<SELECT foo AS bar>.
3281 The C<as> attribute is used in conjunction with C<select>,
3282 usually when C<select> contains one or more function or stored
3285 $rs = $schema->resultset('Employee')->search(undef, {
3288 { count => 'employeeid' }
3290 as => ['name', 'employee_count'],
3293 my $employee = $rs->first(); # get the first Employee
3295 If the object against which the search is performed already has an accessor
3296 matching a column name specified in C<as>, the value can be retrieved using
3297 the accessor as normal:
3299 my $name = $employee->name();
3301 If on the other hand an accessor does not exist in the object, you need to
3302 use C<get_column> instead:
3304 my $employee_count = $employee->get_column('employee_count');
3306 You can create your own accessors if required - see
3307 L<DBIx::Class::Manual::Cookbook> for details.
3309 Please note: This will NOT insert an C<AS employee_count> into the SQL
3310 statement produced, it is used for internal access only. Thus
3311 attempting to use the accessor in an C<order_by> clause or similar
3312 will fail miserably.
3314 To get around this limitation, you can supply literal SQL to your
3315 C<select> attibute that contains the C<AS alias> text, eg:
3317 select => [\'myfield AS alias']
3323 =item Value: ($rel_name | \@rel_names | \%rel_names)
3327 Contains a list of relationships that should be joined for this query. For
3330 # Get CDs by Nine Inch Nails
3331 my $rs = $schema->resultset('CD')->search(
3332 { 'artist.name' => 'Nine Inch Nails' },
3333 { join => 'artist' }
3336 Can also contain a hash reference to refer to the other relation's relations.
3339 package MyApp::Schema::Track;
3340 use base qw/DBIx::Class/;
3341 __PACKAGE__->table('track');
3342 __PACKAGE__->add_columns(qw/trackid cd position title/);
3343 __PACKAGE__->set_primary_key('trackid');
3344 __PACKAGE__->belongs_to(cd => 'MyApp::Schema::CD');
3347 # In your application
3348 my $rs = $schema->resultset('Artist')->search(
3349 { 'track.title' => 'Teardrop' },
3351 join => { cd => 'track' },
3352 order_by => 'artist.name',
3356 You need to use the relationship (not the table) name in conditions,
3357 because they are aliased as such. The current table is aliased as "me", so
3358 you need to use me.column_name in order to avoid ambiguity. For example:
3360 # Get CDs from 1984 with a 'Foo' track
3361 my $rs = $schema->resultset('CD')->search(
3364 'tracks.name' => 'Foo'
3366 { join => 'tracks' }
3369 If the same join is supplied twice, it will be aliased to <rel>_2 (and
3370 similarly for a third time). For e.g.
3372 my $rs = $schema->resultset('Artist')->search({
3373 'cds.title' => 'Down to Earth',
3374 'cds_2.title' => 'Popular',
3376 join => [ qw/cds cds/ ],
3379 will return a set of all artists that have both a cd with title 'Down
3380 to Earth' and a cd with title 'Popular'.
3382 If you want to fetch related objects from other tables as well, see C<prefetch>
3385 For more help on using joins with search, see L<DBIx::Class::Manual::Joining>.
3391 =item Value: ($rel_name | \@rel_names | \%rel_names)
3395 Contains one or more relationships that should be fetched along with
3396 the main query (when they are accessed afterwards the data will
3397 already be available, without extra queries to the database). This is
3398 useful for when you know you will need the related objects, because it
3399 saves at least one query:
3401 my $rs = $schema->resultset('Tag')->search(
3410 The initial search results in SQL like the following:
3412 SELECT tag.*, cd.*, artist.* FROM tag
3413 JOIN cd ON tag.cd = cd.cdid
3414 JOIN artist ON cd.artist = artist.artistid
3416 L<DBIx::Class> has no need to go back to the database when we access the
3417 C<cd> or C<artist> relationships, which saves us two SQL statements in this
3420 Simple prefetches will be joined automatically, so there is no need
3421 for a C<join> attribute in the above search.
3423 C<prefetch> can be used with the following relationship types: C<belongs_to>,
3424 C<has_one> (or if you're using C<add_relationship>, any relationship declared
3425 with an accessor type of 'single' or 'filter'). A more complex example that
3426 prefetches an artists cds, the tracks on those cds, and the tags associted
3427 with that artist is given below (assuming many-to-many from artists to tags):
3429 my $rs = $schema->resultset('Artist')->search(
3433 { cds => 'tracks' },
3434 { artist_tags => 'tags' }
3440 B<NOTE:> If you specify a C<prefetch> attribute, the C<join> and C<select>
3441 attributes will be ignored.
3443 B<CAVEATs>: Prefetch does a lot of deep magic. As such, it may not behave
3444 exactly as you might expect.
3450 Prefetch uses the L</cache> to populate the prefetched relationships. This
3451 may or may not be what you want.
3455 If you specify a condition on a prefetched relationship, ONLY those
3456 rows that match the prefetched condition will be fetched into that relationship.
3457 This means that adding prefetch to a search() B<may alter> what is returned by
3458 traversing a relationship. So, if you have C<< Artist->has_many(CDs) >> and you do
3460 my $artist_rs = $schema->resultset('Artist')->search({
3466 my $count = $artist_rs->first->cds->count;
3468 my $artist_rs_prefetch = $artist_rs->search( {}, { prefetch => 'cds' } );
3470 my $prefetch_count = $artist_rs_prefetch->first->cds->count;
3472 cmp_ok( $count, '==', $prefetch_count, "Counts should be the same" );
3474 that cmp_ok() may or may not pass depending on the datasets involved. This
3475 behavior may or may not survive the 0.09 transition.
3487 Makes the resultset paged and specifies the page to retrieve. Effectively
3488 identical to creating a non-pages resultset and then calling ->page($page)
3491 If L<rows> attribute is not specified it defaults to 10 rows per page.
3493 When you have a paged resultset, L</count> will only return the number
3494 of rows in the page. To get the total, use the L</pager> and call
3495 C<total_entries> on it.
3505 Specifes the maximum number of rows for direct retrieval or the number of
3506 rows per page if the page attribute or method is used.
3512 =item Value: $offset
3516 Specifies the (zero-based) row number for the first row to be returned, or the
3517 of the first row of the first page if paging is used.
3523 =item Value: \@columns
3527 A arrayref of columns to group by. Can include columns of joined tables.
3529 group_by => [qw/ column1 column2 ... /]
3535 =item Value: $condition
3539 HAVING is a select statement attribute that is applied between GROUP BY and
3540 ORDER BY. It is applied to the after the grouping calculations have been
3543 having => { 'count(employee)' => { '>=', 100 } }
3549 =item Value: (0 | 1)
3553 Set to 1 to group by all columns. If the resultset already has a group_by
3554 attribute, this setting is ignored and an appropriate warning is issued.
3560 Adds to the WHERE clause.
3562 # only return rows WHERE deleted IS NULL for all searches
3563 __PACKAGE__->resultset_attributes({ where => { deleted => undef } }); )
3565 Can be overridden by passing C<< { where => undef } >> as an attribute
3572 Set to 1 to cache search results. This prevents extra SQL queries if you
3573 revisit rows in your ResultSet:
3575 my $resultset = $schema->resultset('Artist')->search( undef, { cache => 1 } );
3577 while( my $artist = $resultset->next ) {
3581 $rs->first; # without cache, this would issue a query
3583 By default, searches are not cached.
3585 For more examples of using these attributes, see
3586 L<DBIx::Class::Manual::Cookbook>.
3592 =item Value: ( 'update' | 'shared' )
3596 Set to 'update' for a SELECT ... FOR UPDATE or 'shared' for a SELECT