use strict;
use warnings;
use overload
- '0+' => 'count',
+ '0+' => \&count,
+ 'bool' => sub { 1; },
fallback => 1;
use Data::Page;
+use Storable;
+use Scalar::Util qw/weaken/;
+
+use base qw/DBIx::Class/;
+__PACKAGE__->load_components(qw/AccessorGroup/);
+__PACKAGE__->mk_group_accessors('simple' => qw/result_source result_class/);
=head1 NAME
-DBIX::Class::Recordset - Responsible for fetching and creating recordsets.
+DBIx::Class::ResultSet - Responsible for fetching and creating resultset.
-=head1 SYNOPSIS;
+=head1 SYNOPSIS
-$rs=MyApp::DB::Class->search(registered=>1);
+ my $rs = $schema->resultset('User')->search(registered => 1);
+ my @rows = $schema->resultset('Foo')->search(bar => 'baz');
=head1 DESCRIPTION
-The recordset is also know as an iterator.
+The resultset is also known as an iterator. It is responsible for handling
+queries that may return an arbitrary number of rows, e.g. via L</search>
+or a C<has_many> relationship.
+
+In the examples below, the following table classes are used:
+
+ package MyApp::Schema::Artist;
+ use base qw/DBIx::Class/;
+ __PACKAGE__->load_components(qw/Core/);
+ __PACKAGE__->table('artist');
+ __PACKAGE__->add_columns(qw/artistid name/);
+ __PACKAGE__->set_primary_key('artistid');
+ __PACKAGE__->has_many(cds => 'MyApp::Schema::CD');
+ 1;
+
+ package MyApp::Schema::CD;
+ use base qw/DBIx::Class/;
+ __PACKAGE__->load_components(qw/Core/);
+ __PACKAGE__->table('cd');
+ __PACKAGE__->add_columns(qw/cdid artist title year/);
+ __PACKAGE__->set_primary_key('cdid');
+ __PACKAGE__->belongs_to(artist => 'MyApp::Schema::Artist');
+ 1;
=head1 METHODS
-=over 4
+=head2 new
+
+=head3 Arguments: ($source, \%$attrs)
+
+The resultset constructor. Takes a source object (usually a
+L<DBIx::Class::ResultSourceProxy::Table>) and an attribute hash (see L</ATTRIBUTES>
+below). Does not perform any queries -- these are executed as needed by the
+other methods.
-=item new <db_class> <attrs>
+Generally you won't need to construct a resultset manually. You'll
+automatically get one from e.g. a L</search> called in scalar context:
-The recordset constructor. Takes a db class and an
-attribute hash (see below for more info on attributes)
+ my $rs = $schema->resultset('CD')->search({ title => '100th Window' });
=cut
sub new {
- my ($it_class, $db_class, $attrs) = @_;
- #use Data::Dumper; warn Dumper(@_);
- $it_class = ref $it_class if ref $it_class;
- $attrs = { %{ $attrs || {} } };
+ my $class = shift;
+ return $class->new_result(@_) if ref $class;
+
+ my ($source, $attrs) = @_;
+ weaken $source;
+ $attrs = Storable::dclone($attrs || {}); # { %{ $attrs || {} } };
+ #use Data::Dumper; warn Dumper($attrs);
+ my $alias = ($attrs->{alias} ||= 'me');
+
+ $attrs->{columns} ||= delete $attrs->{cols} if $attrs->{cols};
+ delete $attrs->{as} if $attrs->{columns};
+ $attrs->{columns} ||= [ $source->columns ] unless $attrs->{select};
+ $attrs->{select} = [ map { m/\./ ? $_ : "${alias}.$_" } @{delete $attrs->{columns}} ]
+ if $attrs->{columns};
+ $attrs->{as} ||= [ map { m/^\Q$alias.\E(.+)$/ ? $1 : $_ } @{$attrs->{select}} ];
+ if (my $include = delete $attrs->{include_columns}) {
+ push(@{$attrs->{select}}, @$include);
+ push(@{$attrs->{as}}, map { m/([^.]+)$/; $1; } @$include);
+ }
+ #use Data::Dumper; warn Dumper(@{$attrs}{qw/select as/});
+
+ $attrs->{from} ||= [ { $alias => $source->from } ];
+ $attrs->{seen_join} ||= {};
my %seen;
- $attrs->{cols} ||= [ map { "me.$_" } $db_class->_select_columns ];
- $attrs->{from} ||= [ { 'me' => $db_class->_table_name } ];
- if ($attrs->{join}) {
- foreach my $j (ref $attrs->{join} eq 'ARRAY'
- ? (@{$attrs->{join}}) : ($attrs->{join})) {
+ if (my $join = delete $attrs->{join}) {
+ foreach my $j (ref $join eq 'ARRAY' ? @$join : ($join)) {
if (ref $j eq 'HASH') {
$seen{$_} = 1 foreach keys %$j;
} else {
$seen{$j} = 1;
}
}
- push(@{$attrs->{from}}, $db_class->_resolve_join($attrs->{join}, 'me'));
+ push(@{$attrs->{from}}, $source->resolve_join($join, $attrs->{alias}, $attrs->{seen_join}));
+ }
+
+ $attrs->{group_by} ||= $attrs->{select} if delete $attrs->{distinct};
+ $attrs->{order_by} = [ $attrs->{order_by} ] if $attrs->{order_by} and !ref($attrs->{order_by});
+ $attrs->{order_by} ||= [];
+
+ my $collapse = $attrs->{collapse} || {};
+ if (my $prefetch = delete $attrs->{prefetch}) {
+ my @pre_order;
+ foreach my $p (ref $prefetch eq 'ARRAY' ? @$prefetch : ($prefetch)) {
+ if ( ref $p eq 'HASH' ) {
+ foreach my $key (keys %$p) {
+ push(@{$attrs->{from}}, $source->resolve_join($p, $attrs->{alias}))
+ unless $seen{$key};
+ }
+ } else {
+ push(@{$attrs->{from}}, $source->resolve_join($p, $attrs->{alias}))
+ unless $seen{$p};
+ }
+ my @prefetch = $source->resolve_prefetch(
+ $p, $attrs->{alias}, {}, \@pre_order, $collapse);
+ push(@{$attrs->{select}}, map { $_->[0] } @prefetch);
+ push(@{$attrs->{as}}, map { $_->[1] } @prefetch);
+ }
+ push(@{$attrs->{order_by}}, @pre_order);
}
- foreach my $pre (@{$attrs->{prefetch} || []}) {
- push(@{$attrs->{from}}, $db_class->_resolve_join($pre, 'me'))
- unless $seen{$pre};
- push(@{$attrs->{cols}},
- map { "$pre.$_" }
- $db_class->_relationships->{$pre}->{class}->_select_columns);
+ $attrs->{collapse} = $collapse;
+# use Data::Dumper; warn Dumper($collapse) if keys %{$collapse};
+
+ if ($attrs->{page}) {
+ $attrs->{rows} ||= 10;
+ $attrs->{offset} ||= 0;
+ $attrs->{offset} += ($attrs->{rows} * ($attrs->{page} - 1));
}
- my $new = {
- class => $db_class,
- cols => $attrs->{cols} || [ $db_class->_select_columns ],
+
+ bless {
+ result_source => $source,
+ result_class => $attrs->{result_class} || $source->result_class,
cond => $attrs->{where},
- from => $attrs->{from} || $db_class->_table_name,
+ from => $attrs->{from},
+ collapse => $collapse,
count => undef,
+ page => delete $attrs->{page},
pager => undef,
- attrs => $attrs };
- bless ($new, $it_class);
- $new->pager if ($attrs->{page});
- return $new;
+ attrs => $attrs
+ }, $class;
}
-=item cursor
+=head2 search
+
+ my @obj = $rs->search({ foo => 3 }); # "... WHERE foo = 3"
+ my $new_rs = $rs->search({ foo => 3 });
-Return a storage driven cursor to the given record set.
+If you need to pass in additional attributes but no additional condition,
+call it as C<search(undef, \%attrs);>.
+
+ # "SELECT foo, bar FROM $class_table"
+ my @all = $class->search(undef, { columns => [qw/foo bar/] });
+
+=cut
+
+sub search {
+ my $self = shift;
+
+ my $rs;
+ if( @_ ) {
+
+ my $attrs = { %{$self->{attrs}} };
+ my $having = delete $attrs->{having};
+ $attrs = { %$attrs, %{ pop(@_) } } if @_ > 1 and ref $_[$#_] eq 'HASH';
+
+ my $where = (@_
+ ? ((@_ == 1 || ref $_[0] eq "HASH")
+ ? shift
+ : ((@_ % 2)
+ ? $self->throw_exception(
+ "Odd number of arguments to search")
+ : {@_}))
+ : undef());
+ if (defined $where) {
+ $attrs->{where} = (defined $attrs->{where}
+ ? { '-and' =>
+ [ map { ref $_ eq 'ARRAY' ? [ -or => $_ ] : $_ }
+ $where, $attrs->{where} ] }
+ : $where);
+ }
+
+ if (defined $having) {
+ $attrs->{having} = (defined $attrs->{having}
+ ? { '-and' =>
+ [ map { ref $_ eq 'ARRAY' ? [ -or => $_ ] : $_ }
+ $having, $attrs->{having} ] }
+ : $having);
+ }
+
+ $rs = (ref $self)->new($self->result_source, $attrs);
+ }
+ else {
+ $rs = $self;
+ $rs->reset;
+ }
+ return (wantarray ? $rs->all : $rs);
+}
+
+=head2 search_literal
+
+ my @obj = $rs->search_literal($literal_where_cond, @bind);
+ my $new_rs = $rs->search_literal($literal_where_cond, @bind);
+
+Pass a literal chunk of SQL to be added to the conditional part of the
+resultset.
+
+=cut
+
+sub search_literal {
+ my ($self, $cond, @vals) = @_;
+ my $attrs = (ref $vals[$#vals] eq 'HASH' ? { %{ pop(@vals) } } : {});
+ $attrs->{bind} = [ @{$self->{attrs}{bind}||[]}, @vals ];
+ return $self->search(\$cond, $attrs);
+}
+
+=head2 find
+
+=head3 Arguments: (@colvalues) | (\%cols, \%attrs?)
+
+Finds a row based on its primary key or unique constraint. For example:
+
+ my $cd = $schema->resultset('CD')->find(5);
+
+Also takes an optional C<key> attribute, to search by a specific key or unique
+constraint. For example:
+
+ my $cd = $schema->resultset('CD')->find(
+ {
+ artist => 'Massive Attack',
+ title => 'Mezzanine',
+ },
+ { key => 'artist_title' }
+ );
+
+See also L</find_or_create> and L</update_or_create>.
+
+=cut
+
+sub find {
+ my ($self, @vals) = @_;
+ my $attrs = (@vals > 1 && ref $vals[$#vals] eq 'HASH' ? pop(@vals) : {});
+
+ my @cols = $self->result_source->primary_columns;
+ if (exists $attrs->{key}) {
+ my %uniq = $self->result_source->unique_constraints;
+ $self->throw_exception( "Unknown key $attrs->{key} on $self->name" )
+ unless exists $uniq{$attrs->{key}};
+ @cols = @{ $uniq{$attrs->{key}} };
+ }
+ #use Data::Dumper; warn Dumper($attrs, @vals, @cols);
+ $self->throw_exception( "Can't find unless a primary key or unique constraint is defined" )
+ unless @cols;
+
+ my $query;
+ if (ref $vals[0] eq 'HASH') {
+ $query = { %{$vals[0]} };
+ } elsif (@cols == @vals) {
+ $query = {};
+ @{$query}{@cols} = @vals;
+ } else {
+ $query = {@vals};
+ }
+ foreach my $key (grep { ! m/\./ } keys %$query) {
+ $query->{"$self->{attrs}{alias}.$key"} = delete $query->{$key};
+ }
+ #warn Dumper($query);
+
+ if (keys %$attrs) {
+ my $rs = $self->search($query,$attrs);
+ return keys %{$rs->{collapse}} ? $rs->next : $rs->single;
+ } else {
+ return keys %{$self->{collapse}} ? $self->search($query)->next : $self->single($query);
+ }
+}
+
+=head2 search_related
+
+ $rs->search_related('relname', $cond?, $attrs?);
+
+Search the specified relationship. Optionally specify a condition for matching
+records.
+
+=cut
+
+sub search_related {
+ return shift->related_resultset(shift)->search(@_);
+}
+
+=head2 cursor
+
+Returns a storage-driven cursor to the given resultset.
=cut
sub cursor {
my ($self) = @_;
- my ($db_class, $attrs) = @{$self}{qw/class attrs/};
- if ($attrs->{page}) {
- $attrs->{rows} = $self->pager->entries_per_page;
- $attrs->{offset} = $self->pager->skipped;
- }
+ my $attrs = { %{$self->{attrs}} };
return $self->{cursor}
- ||= $db_class->storage->select($self->{from}, $self->{cols},
+ ||= $self->result_source->storage->select($self->{from}, $attrs->{select},
$attrs->{where},$attrs);
}
-=item slice <first> <last>
+=head2 single
-return a number of elements from the given record set.
+Inflates the first result without creating a cursor
+
+=cut
+
+sub single {
+ my ($self, $where) = @_;
+ my $attrs = { %{$self->{attrs}} };
+ if ($where) {
+ if (defined $attrs->{where}) {
+ $attrs->{where} = {
+ '-and' =>
+ [ map { ref $_ eq 'ARRAY' ? [ -or => $_ ] : $_ }
+ $where, delete $attrs->{where} ]
+ };
+ } else {
+ $attrs->{where} = $where;
+ }
+ }
+ my @data = $self->result_source->storage->select_single(
+ $self->{from}, $attrs->{select},
+ $attrs->{where},$attrs);
+ return (@data ? $self->_construct_object(@data) : ());
+}
+
+
+=head2 search_like
+
+Perform a search, but use C<LIKE> instead of equality as the condition. Note
+that this is simply a convenience method; you most likely want to use
+L</search> with specific operators.
+
+For more information, see L<DBIx::Class::Manual::Cookbook>.
+
+=cut
+
+sub search_like {
+ my $class = shift;
+ my $attrs = (@_ > 1 && ref $_[$#_] eq 'HASH' ? pop(@_) : {});
+ my $query = ref $_[0] eq 'HASH' ? { %{shift()} }: {@_};
+ $query->{$_} = { 'like' => $query->{$_} } for keys %$query;
+ return $class->search($query, { %$attrs });
+}
+
+=head2 slice
+
+=head3 Arguments: ($first, $last)
+
+Returns a subset of elements from the resultset.
=cut
sub slice {
my ($self, $min, $max) = @_;
my $attrs = { %{ $self->{attrs} || {} } };
- $self->{class}->throw("Can't slice without where") unless $attrs->{where};
- $attrs->{offset} = $min;
+ $attrs->{offset} ||= 0;
+ $attrs->{offset} += $min;
$attrs->{rows} = ($max ? ($max - $min + 1) : 1);
- my $slice = $self->new($self->{class}, $attrs);
+ my $slice = (ref $self)->new($self->result_source, $attrs);
return (wantarray ? $slice->all : $slice);
}
-=item next
+=head2 next
+
+Returns the next element in the resultset (C<undef> is there is none).
+
+Can be used to efficiently iterate over records in the resultset:
-Returns the next element in this record set.
+ my $rs = $schema->resultset('CD')->search;
+ while (my $cd = $rs->next) {
+ print $cd->title;
+ }
=cut
sub next {
my ($self) = @_;
- my @row = $self->cursor->next;
+ if (@{$self->{all_cache} || []}) {
+ $self->{all_cache_position} ||= 0;
+ return $self->{all_cache}->[$self->{all_cache_position}++];
+ }
+ if ($self->{attrs}{cache}) {
+ $self->{all_cache_position} = 1;
+ return ($self->all)[0];
+ }
+ my @row = (exists $self->{stashed_row}
+ ? @{delete $self->{stashed_row}}
+ : $self->cursor->next);
+# warn Dumper(\@row); use Data::Dumper;
return unless (@row);
return $self->_construct_object(@row);
}
sub _construct_object {
my ($self, @row) = @_;
- my @cols = @{ $self->{attrs}{cols} };
- s/^me\.// for @cols;
- @cols = grep { ! /\./ } @cols;
- my $new;
- unless ($self->{attrs}{prefetch}) {
- $new = $self->{class}->_row_to_object(\@cols, \@row);
- } else {
- my @main = splice(@row, 0, scalar @cols);
- $new = $self->{class}->_row_to_object(\@cols, \@main);
- PRE: foreach my $pre (@{$self->{attrs}{prefetch}}) {
- my $rel_obj = $self->{class}->_relationships->{$pre};
- my $pre_class = $self->{class}->resolve_class($rel_obj->{class});
- my @pre_cols = $pre_class->_select_columns;
- my @vals = splice(@row, 0, scalar @pre_cols);
- my $fetched = $pre_class->_row_to_object(\@pre_cols, \@vals);
- $self->{class}->throw("No accessor for prefetched $pre")
- unless defined $rel_obj->{attrs}{accessor};
- if ($rel_obj->{attrs}{accessor} eq 'single') {
- foreach my $pri ($rel_obj->{class}->primary_columns) {
- unless (defined $fetched->get_column($pri)) {
- undef $fetched;
- last;
- }
- }
- $new->{_relationship_data}{$pre} = $fetched;
- } elsif ($rel_obj->{attrs}{accessor} eq 'filter') {
- $new->{_inflated_column}{$pre} = $fetched;
- } else {
- $self->{class}->throw("Don't know how to store prefetched $pre");
- }
- }
- }
+ my @as = @{ $self->{attrs}{as} };
+
+ my $info = $self->_collapse_result(\@as, \@row);
+
+ my $new = $self->result_class->inflate_result($self->result_source, @$info);
+
$new = $self->{attrs}{record_filter}->($new)
if exists $self->{attrs}{record_filter};
return $new;
}
-=item count
+sub _collapse_result {
+ my ($self, $as, $row, $prefix) = @_;
+
+ my %const;
+
+ my @copy = @$row;
+ foreach my $this_as (@$as) {
+ my $val = shift @copy;
+ if (defined $prefix) {
+ if ($this_as =~ m/^\Q${prefix}.\E(.+)$/) {
+ my $remain = $1;
+ $remain =~ /^(?:(.*)\.)?([^.]+)$/;
+ $const{$1||''}{$2} = $val;
+ }
+ } else {
+ $this_as =~ /^(?:(.*)\.)?([^.]+)$/;
+ $const{$1||''}{$2} = $val;
+ }
+ }
+
+ my $info = [ {}, {} ];
+ foreach my $key (keys %const) {
+ if (length $key) {
+ my $target = $info;
+ my @parts = split(/\./, $key);
+ foreach my $p (@parts) {
+ $target = $target->[1]->{$p} ||= [];
+ }
+ $target->[0] = $const{$key};
+ } else {
+ $info->[0] = $const{$key};
+ }
+ }
+
+ my @collapse = (defined($prefix)
+ ? (map { (m/^\Q${prefix}.\E(.+)$/ ? ($1) : ()); }
+ keys %{$self->{collapse}})
+ : keys %{$self->{collapse}});
+ if (@collapse) {
+ my ($c) = sort { length $a <=> length $b } @collapse;
+ my $target = $info;
+ foreach my $p (split(/\./, $c)) {
+ $target = $target->[1]->{$p} ||= [];
+ }
+ my $c_prefix = (defined($prefix) ? "${prefix}.${c}" : $c);
+ my @co_key = @{$self->{collapse}{$c_prefix}};
+ my %co_check = map { ($_, $target->[0]->{$_}); } @co_key;
+ my $tree = $self->_collapse_result($as, $row, $c_prefix);
+ my (@final, @raw);
+ while ( !(grep {
+ !defined($tree->[0]->{$_})
+ || $co_check{$_} ne $tree->[0]->{$_}
+ } @co_key) ) {
+ push(@final, $tree);
+ last unless (@raw = $self->cursor->next);
+ $row = $self->{stashed_row} = \@raw;
+ $tree = $self->_collapse_result($as, $row, $c_prefix);
+ #warn Data::Dumper::Dumper($tree, $row);
+ }
+ @$target = @final;
+ }
+
+ return $info;
+}
+
+=head2 result_source
-Performs an SQL count with the same query as the resultset was built
-with to find the number of elements.
+Returns a reference to the result source for this recordset.
=cut
+=head2 count
+
+Performs an SQL C<COUNT> with the same query as the resultset was built
+with to find the number of elements. If passed arguments, does a search
+on the resultset and counts the results of that.
+
+Note: When using C<count> with C<group_by>, L<DBIX::Class> emulates C<GROUP BY>
+using C<COUNT( DISTINCT( columns ) )>. Some databases (notably SQLite) do
+not support C<DISTINCT> with multiple columns. If you are using such a
+database, you should only use columns from the main table in your C<group_by>
+clause.
+
+=cut
+
sub count {
- my ($self) = @_;
- my $db_class = $self->{class};
+ my $self = shift;
+ return $self->search(@_)->count if @_ and defined $_[0];
+ return scalar @{ $self->get_cache } if @{ $self->get_cache };
+
+ my $count = $self->_count;
+ return 0 unless $count;
+
+ $count -= $self->{attrs}{offset} if $self->{attrs}{offset};
+ $count = $self->{attrs}{rows} if
+ $self->{attrs}{rows} and $self->{attrs}{rows} < $count;
+ return $count;
+}
+
+sub _count { # Separated out so pager can get the full count
+ my $self = shift;
+ my $select = { count => '*' };
my $attrs = { %{ $self->{attrs} } };
- unless ($self->{count}) {
- # offset and order by are not needed to count
- delete $attrs->{$_} for qw/offset order_by/;
-
- my @cols = 'COUNT(*)';
- $self->{count} = $db_class->storage->select_single($self->{from}, \@cols,
- $self->{cond}, $attrs);
+ if (my $group_by = delete $attrs->{group_by}) {
+ delete $attrs->{having};
+ my @distinct = (ref $group_by ? @$group_by : ($group_by));
+ # todo: try CONCAT for multi-column pk
+ my @pk = $self->result_source->primary_columns;
+ if (@pk == 1) {
+ foreach my $column (@distinct) {
+ if ($column =~ qr/^(?:\Q$attrs->{alias}.\E)?$pk[0]$/) {
+ @distinct = ($column);
+ last;
+ }
+ }
+ }
+
+ $select = { count => { distinct => \@distinct } };
+ #use Data::Dumper; die Dumper $select;
}
- return 0 unless $self->{count};
- return $self->{pager}->entries_on_this_page if ($self->{pager});
- return ( $attrs->{rows} && $attrs->{rows} < $self->{count} )
- ? $attrs->{rows}
- : $self->{count};
+
+ $attrs->{select} = $select;
+ $attrs->{as} = [qw/count/];
+
+ # offset, order by and page are not needed to count. record_filter is cdbi
+ delete $attrs->{$_} for qw/rows offset order_by page pager record_filter/;
+
+ my ($count) = (ref $self)->new($self->result_source, $attrs)->cursor->next;
+ return $count;
}
-=item all
+=head2 count_literal
-Returns all elements in the recordset. Is called implictly if the search
-method is used in list context.
+Calls L</search_literal> with the passed arguments, then L</count>.
+
+=cut
+
+sub count_literal { shift->search_literal(@_)->count; }
+
+=head2 all
+
+Returns all elements in the resultset. Called implictly if the resultset
+is returned in list context.
=cut
sub all {
my ($self) = @_;
- return map { $self->_construct_object(@$_); }
- $self->cursor->all;
+ return @{ $self->get_cache } if @{ $self->get_cache };
+
+ my @obj;
+
+ if (keys %{$self->{collapse}}) {
+ # Using $self->cursor->all is really just an optimisation.
+ # If we're collapsing has_many prefetches it probably makes
+ # very little difference, and this is cleaner than hacking
+ # _construct_object to survive the approach
+ $self->cursor->reset;
+ my @row = $self->cursor->next;
+ while (@row) {
+ push(@obj, $self->_construct_object(@row));
+ @row = (exists $self->{stashed_row}
+ ? @{delete $self->{stashed_row}}
+ : $self->cursor->next);
+ }
+ } else {
+ @obj = map { $self->_construct_object(@$_) } $self->cursor->all;
+ }
+
+ $self->set_cache(\@obj) if $self->{attrs}{cache};
+ return @obj;
}
-=item reset
+=head2 reset
-Reset this recordset's cursor, so you can iterate through the elements again.
+Resets the resultset's cursor, so you can iterate through the elements again.
=cut
sub reset {
my ($self) = @_;
+ $self->{all_cache_position} = 0;
$self->cursor->reset;
return $self;
}
-=item first
+=head2 first
-resets the recordset and returns the first element.
+Resets the resultset and returns the first element.
=cut
return $_[0]->reset->next;
}
-=item delete
+=head2 update
+
+=head3 Arguments: (\%values)
+
+Sets the specified columns in the resultset to the supplied values.
+
+=cut
+
+sub update {
+ my ($self, $values) = @_;
+ $self->throw_exception("Values for update must be a hash") unless ref $values eq 'HASH';
+ return $self->result_source->storage->update(
+ $self->result_source->from, $values, $self->{cond});
+}
+
+=head2 update_all
+
+=head3 Arguments: (\%values)
-Deletes all elements in the recordset.
+Fetches all objects and updates them one at a time. Note that C<update_all>
+will run cascade triggers while L</update> will not.
+
+=cut
+
+sub update_all {
+ my ($self, $values) = @_;
+ $self->throw_exception("Values for update must be a hash") unless ref $values eq 'HASH';
+ foreach my $obj ($self->all) {
+ $obj->set_columns($values)->update;
+ }
+ return 1;
+}
+
+=head2 delete
+
+Deletes the contents of the resultset from its result source.
=cut
sub delete {
my ($self) = @_;
- $_->delete for $self->all;
+ my $del = {};
+
+ if (!ref($self->{cond})) {
+
+ # No-op. No condition, we're deleting everything
+
+ } elsif (ref $self->{cond} eq 'ARRAY') {
+
+ $del = [ map { my %hash;
+ foreach my $key (keys %{$_}) {
+ $key =~ /([^.]+)$/;
+ $hash{$1} = $_->{$key};
+ }; \%hash; } @{$self->{cond}} ];
+
+ } elsif (ref $self->{cond} eq 'HASH') {
+
+ if ((keys %{$self->{cond}})[0] eq '-and') {
+
+ $del->{-and} = [ map { my %hash;
+ foreach my $key (keys %{$_}) {
+ $key =~ /([^.]+)$/;
+ $hash{$1} = $_->{$key};
+ }; \%hash; } @{$self->{cond}{-and}} ];
+
+ } else {
+
+ foreach my $key (keys %{$self->{cond}}) {
+ $key =~ /([^.]+)$/;
+ $del->{$1} = $self->{cond}{$key};
+ }
+ }
+ } else {
+ $self->throw_exception(
+ "Can't delete on resultset with condition unless hash or array");
+ }
+
+ $self->result_source->storage->delete($self->result_source->from, $del);
return 1;
}
-*delete_all = \&delete; # Yeah, yeah, yeah ...
+=head2 delete_all
+
+Fetches all objects and deletes them one at a time. Note that C<delete_all>
+will run cascade triggers while L</delete> will not.
+
+=cut
+
+sub delete_all {
+ my ($self) = @_;
+ $_->delete for $self->all;
+ return 1;
+}
-=item pager
+=head2 pager
Returns a L<Data::Page> object for the current resultset. Only makes
-sense for queries with page turned on.
+sense for queries with a C<page> attribute.
=cut
sub pager {
my ($self) = @_;
my $attrs = $self->{attrs};
- delete $attrs->{offset};
- my $rows_per_page = delete $attrs->{rows} || 10;
- $self->{pager} ||= Data::Page->new(
- $self->count, $rows_per_page, $attrs->{page} || 1);
- $attrs->{rows} = $rows_per_page;
- return $self->{pager};
+ $self->throw_exception("Can't create pager for non-paged rs") unless $self->{page};
+ $attrs->{rows} ||= 10;
+ return $self->{pager} ||= Data::Page->new(
+ $self->_count, $attrs->{rows}, $self->{page});
}
-=item page <page>
+=head2 page
+
+=head3 Arguments: ($page_num)
-Returns a new recordset representing a given page.
+Returns a new resultset for the specified page.
=cut
sub page {
my ($self, $page) = @_;
- my $attrs = $self->{attrs};
+ my $attrs = { %{$self->{attrs}} };
$attrs->{page} = $page;
- return $self->new($self->{class}, $attrs);
+ return (ref $self)->new($self->result_source, $attrs);
}
-=back
+=head2 new_result
+
+=head3 Arguments: (\%vals)
+
+Creates a result in the resultset's result class.
+
+=cut
+
+sub new_result {
+ my ($self, $values) = @_;
+ $self->throw_exception( "new_result needs a hash" )
+ unless (ref $values eq 'HASH');
+ $self->throw_exception( "Can't abstract implicit construct, condition not a hash" )
+ if ($self->{cond} && !(ref $self->{cond} eq 'HASH'));
+ my %new = %$values;
+ my $alias = $self->{attrs}{alias};
+ foreach my $key (keys %{$self->{cond}||{}}) {
+ $new{$1} = $self->{cond}{$key} if ($key =~ m/^(?:\Q${alias}.\E)?([^.]+)$/);
+ }
+ my $obj = $self->result_class->new(\%new);
+ $obj->result_source($self->result_source) if $obj->can('result_source');
+ return $obj;
+}
-=head1 Attributes
+=head2 create
-The recordset is responsible for handling the various attributes that
-can be passed in with the search functions. Here's an overview of them:
+=head3 Arguments: (\%vals)
-=over 4
+Inserts a record into the resultset and returns the object.
-=item order_by
+Effectively a shortcut for C<< ->new_result(\%vals)->insert >>.
-Which column to order the results by.
+=cut
-=item cols
+sub create {
+ my ($self, $attrs) = @_;
+ $self->throw_exception( "create needs a hashref" ) unless ref $attrs eq 'HASH';
+ return $self->new_result($attrs)->insert;
+}
-Which cols should be retrieved on the first search.
+=head2 find_or_create
-=item join
+=head3 Arguments: (\%vals, \%attrs?)
-Contains a list of relations that should be joined for this query. Can also
-contain a hash referece to refer to that relation's relations.
+ $class->find_or_create({ key => $val, ... });
+
+Searches for a record matching the search condition; if it doesn't find one,
+creates one and returns that instead.
+
+ my $cd = $schema->resultset('CD')->find_or_create({
+ cdid => 5,
+ artist => 'Massive Attack',
+ title => 'Mezzanine',
+ year => 2005,
+ });
+
+Also takes an optional C<key> attribute, to search by a specific key or unique
+constraint. For example:
+
+ my $cd = $schema->resultset('CD')->find_or_create(
+ {
+ artist => 'Massive Attack',
+ title => 'Mezzanine',
+ },
+ { key => 'artist_title' }
+ );
+
+See also L</find> and L</update_or_create>.
+
+=cut
+
+sub find_or_create {
+ my $self = shift;
+ my $attrs = (@_ > 1 && ref $_[$#_] eq 'HASH' ? pop(@_) : {});
+ my $hash = ref $_[0] eq 'HASH' ? shift : {@_};
+ my $exists = $self->find($hash, $attrs);
+ return defined $exists ? $exists : $self->create($hash);
+}
-=item from
+=head2 update_or_create
-This attribute can contain a arrayref of elements. each element can be another
-arrayref, to nest joins, or it can be a hash which represents the two sides
-of the join.
+ $class->update_or_create({ key => $val, ... });
-*NOTE* Use this on your own risk. This allows you to shoot your foot off!
+First, search for an existing row matching one of the unique constraints
+(including the primary key) on the source of this resultset. If a row is
+found, update it with the other given column values. Otherwise, create a new
+row.
-=item page
+Takes an optional C<key> attribute to search on a specific unique constraint.
+For example:
-Should the resultset be paged? This can also be enabled by using the
-'page' option.
+ # In your application
+ my $cd = $schema->resultset('CD')->update_or_create(
+ {
+ artist => 'Massive Attack',
+ title => 'Mezzanine',
+ year => 1998,
+ },
+ { key => 'artist_title' }
+ );
-=item rows
+If no C<key> is specified, it searches on all unique constraints defined on the
+source, including the primary key.
-For paged resultsset, how many rows per page
+If the C<key> is specified as C<primary>, search only on the primary key.
-=item offset
+See also L</find> and L</find_or_create>.
-For paged resultsset, which page to start on.
+=cut
+
+sub update_or_create {
+ my $self = shift;
+ my $attrs = (@_ > 1 && ref $_[$#_] eq 'HASH' ? pop(@_) : {});
+ my $hash = ref $_[0] eq 'HASH' ? shift : {@_};
+
+ my %unique_constraints = $self->result_source->unique_constraints;
+ my @constraint_names = (exists $attrs->{key}
+ ? ($attrs->{key})
+ : keys %unique_constraints);
+
+ my @unique_hashes;
+ foreach my $name (@constraint_names) {
+ my @unique_cols = @{ $unique_constraints{$name} };
+ my %unique_hash =
+ map { $_ => $hash->{$_} }
+ grep { exists $hash->{$_} }
+ @unique_cols;
+
+ push @unique_hashes, \%unique_hash
+ if (scalar keys %unique_hash == scalar @unique_cols);
+ }
+
+ if (@unique_hashes) {
+ my $row = $self->single(\@unique_hashes);
+ if (defined $row) {
+ $row->set_columns($hash);
+ $row->update;
+ return $row;
+ }
+ }
+
+ return $self->create($hash);
+}
+
+=head2 get_cache
+
+Gets the contents of the cache for the resultset.
+
+=cut
+
+sub get_cache {
+ shift->{all_cache} || [];
+}
+
+=head2 set_cache
+
+Sets the contents of the cache for the resultset. Expects an arrayref of objects of the same class as those produced by the resultset.
+
+=cut
+
+sub set_cache {
+ my ( $self, $data ) = @_;
+ $self->throw_exception("set_cache requires an arrayref")
+ if ref $data ne 'ARRAY';
+ my $result_class = $self->result_class;
+ foreach( @$data ) {
+ $self->throw_exception("cannot cache object of type '$_', expected '$result_class'")
+ if ref $_ ne $result_class;
+ }
+ $self->{all_cache} = $data;
+}
+
+=head2 clear_cache
+
+Clears the cache for the resultset.
+
+=cut
+
+sub clear_cache {
+ shift->set_cache([]);
+}
+
+=head2 related_resultset
+
+Returns a related resultset for the supplied relationship name.
+
+ $rs = $rs->related_resultset('foo');
+
+=cut
+
+sub related_resultset {
+ my ( $self, $rel, @rest ) = @_;
+ $self->{related_resultsets} ||= {};
+ return $self->{related_resultsets}{$rel} ||= do {
+ #warn "fetching related resultset for rel '$rel'";
+ my $rel_obj = $self->result_source->relationship_info($rel);
+ $self->throw_exception(
+ "search_related: result source '" . $self->result_source->name .
+ "' has no such relationship ${rel}")
+ unless $rel_obj; #die Dumper $self->{attrs};
+
+ my $rs = $self->search(undef, { join => $rel });
+ my $alias = defined $rs->{attrs}{seen_join}{$rel}
+ && $rs->{attrs}{seen_join}{$rel} > 1
+ ? join('_', $rel, $rs->{attrs}{seen_join}{$rel})
+ : $rel;
+
+ $self->result_source->schema->resultset($rel_obj->{class}
+ )->search( undef,
+ { %{$rs->{attrs}},
+ alias => $alias,
+ select => undef,
+ as => undef }
+ )->search(@rest);
+ };
+}
+
+=head2 throw_exception
+
+See Schema's throw_exception
+
+=cut
-=back
+sub throw_exception {
+ my $self=shift;
+ $self->result_source->schema->throw_exception(@_);
+}
+
+=head1 ATTRIBUTES
+
+The resultset takes various attributes that modify its behavior. Here's an
+overview of them:
+
+=head2 order_by
+
+Which column(s) to order the results by. This is currently passed through
+directly to SQL, so you can give e.g. C<foo DESC> for a descending order.
+
+=head2 columns
+
+=head3 Arguments: (arrayref)
+
+Shortcut to request a particular set of columns to be retrieved. Adds
+C<me.> onto the start of any column without a C<.> in it and sets C<select>
+from that, then auto-populates C<as> from C<select> as normal. (You may also
+use the C<cols> attribute, as in earlier versions of DBIC.)
+
+=head2 include_columns
+
+=head3 Arguments: (arrayref)
+
+Shortcut to include additional columns in the returned results - for example
+
+ { include_columns => ['foo.name'], join => ['foo'] }
+
+would add a 'name' column to the information passed to object inflation
+
+=head2 select
+
+=head3 Arguments: (arrayref)
+
+Indicates which columns should be selected from the storage. You can use
+column names, or in the case of RDBMS back ends, function or stored procedure
+names:
+
+ $rs = $schema->resultset('Foo')->search(
+ undef,
+ {
+ select => [
+ 'column_name',
+ { count => 'column_to_count' },
+ { sum => 'column_to_sum' }
+ ]
+ }
+ );
+
+When you use function/stored procedure names and do not supply an C<as>
+attribute, the column names returned are storage-dependent. E.g. MySQL would
+return a column named C<count(column_to_count)> in the above example.
+
+=head2 as
+
+=head3 Arguments: (arrayref)
+
+Indicates column names for object inflation. This is used in conjunction with
+C<select>, usually when C<select> contains one or more function or stored
+procedure names:
+
+ $rs = $schema->resultset('Foo')->search(
+ undef,
+ {
+ select => [
+ 'column1',
+ { count => 'column2' }
+ ],
+ as => [qw/ column1 column2_count /]
+ }
+ );
+
+ my $foo = $rs->first(); # get the first Foo
+
+If the object against which the search is performed already has an accessor
+matching a column name specified in C<as>, the value can be retrieved using
+the accessor as normal:
+
+ my $column1 = $foo->column1();
+
+If on the other hand an accessor does not exist in the object, you need to
+use C<get_column> instead:
+
+ my $column2_count = $foo->get_column('column2_count');
+
+You can create your own accessors if required - see
+L<DBIx::Class::Manual::Cookbook> for details.
+
+=head2 join
+
+Contains a list of relationships that should be joined for this query. For
+example:
+
+ # Get CDs by Nine Inch Nails
+ my $rs = $schema->resultset('CD')->search(
+ { 'artist.name' => 'Nine Inch Nails' },
+ { join => 'artist' }
+ );
+
+Can also contain a hash reference to refer to the other relation's relations.
+For example:
+
+ package MyApp::Schema::Track;
+ use base qw/DBIx::Class/;
+ __PACKAGE__->table('track');
+ __PACKAGE__->add_columns(qw/trackid cd position title/);
+ __PACKAGE__->set_primary_key('trackid');
+ __PACKAGE__->belongs_to(cd => 'MyApp::Schema::CD');
+ 1;
+
+ # In your application
+ my $rs = $schema->resultset('Artist')->search(
+ { 'track.title' => 'Teardrop' },
+ {
+ join => { cd => 'track' },
+ order_by => 'artist.name',
+ }
+ );
+
+If the same join is supplied twice, it will be aliased to <rel>_2 (and
+similarly for a third time). For e.g.
+
+ my $rs = $schema->resultset('Artist')->search(
+ { 'cds.title' => 'Foo',
+ 'cds_2.title' => 'Bar' },
+ { join => [ qw/cds cds/ ] });
+
+will return a set of all artists that have both a cd with title Foo and a cd
+with title Bar.
+
+If you want to fetch related objects from other tables as well, see C<prefetch>
+below.
+
+=head2 prefetch
+
+=head3 Arguments: arrayref/hashref
+
+Contains one or more relationships that should be fetched along with the main
+query (when they are accessed afterwards they will have already been
+"prefetched"). This is useful for when you know you will need the related
+objects, because it saves at least one query:
+
+ my $rs = $schema->resultset('Tag')->search(
+ undef,
+ {
+ prefetch => {
+ cd => 'artist'
+ }
+ }
+ );
+
+The initial search results in SQL like the following:
+
+ SELECT tag.*, cd.*, artist.* FROM tag
+ JOIN cd ON tag.cd = cd.cdid
+ JOIN artist ON cd.artist = artist.artistid
+
+L<DBIx::Class> has no need to go back to the database when we access the
+C<cd> or C<artist> relationships, which saves us two SQL statements in this
+case.
+
+Simple prefetches will be joined automatically, so there is no need
+for a C<join> attribute in the above search. If you're prefetching to
+depth (e.g. { cd => { artist => 'label' } or similar), you'll need to
+specify the join as well.
+
+C<prefetch> can be used with the following relationship types: C<belongs_to>,
+C<has_one> (or if you're using C<add_relationship>, any relationship declared
+with an accessor type of 'single' or 'filter').
+
+=head2 from
+
+=head3 Arguments: (arrayref)
+
+The C<from> attribute gives you manual control over the C<FROM> clause of SQL
+statements generated by L<DBIx::Class>, allowing you to express custom C<JOIN>
+clauses.
+
+NOTE: Use this on your own risk. This allows you to shoot off your foot!
+C<join> will usually do what you need and it is strongly recommended that you
+avoid using C<from> unless you cannot achieve the desired result using C<join>.
+
+In simple terms, C<from> works as follows:
+
+ [
+ { <alias> => <table>, -join-type => 'inner|left|right' }
+ [] # nested JOIN (optional)
+ { <table.column> = <foreign_table.foreign_key> }
+ ]
+
+ JOIN
+ <alias> <table>
+ [JOIN ...]
+ ON <table.column> = <foreign_table.foreign_key>
+
+An easy way to follow the examples below is to remember the following:
+
+ Anything inside "[]" is a JOIN
+ Anything inside "{}" is a condition for the enclosing JOIN
+
+The following examples utilize a "person" table in a family tree application.
+In order to express parent->child relationships, this table is self-joined:
+
+ # Person->belongs_to('father' => 'Person');
+ # Person->belongs_to('mother' => 'Person');
+
+C<from> can be used to nest joins. Here we return all children with a father,
+then search against all mothers of those children:
+
+ $rs = $schema->resultset('Person')->search(
+ undef,
+ {
+ alias => 'mother', # alias columns in accordance with "from"
+ from => [
+ { mother => 'person' },
+ [
+ [
+ { child => 'person' },
+ [
+ { father => 'person' },
+ { 'father.person_id' => 'child.father_id' }
+ ]
+ ],
+ { 'mother.person_id' => 'child.mother_id' }
+ ],
+ ]
+ },
+ );
+
+ # Equivalent SQL:
+ # SELECT mother.* FROM person mother
+ # JOIN (
+ # person child
+ # JOIN person father
+ # ON ( father.person_id = child.father_id )
+ # )
+ # ON ( mother.person_id = child.mother_id )
+
+The type of any join can be controlled manually. To search against only people
+with a father in the person table, we could explicitly use C<INNER JOIN>:
+
+ $rs = $schema->resultset('Person')->search(
+ undef,
+ {
+ alias => 'child', # alias columns in accordance with "from"
+ from => [
+ { child => 'person' },
+ [
+ { father => 'person', -join-type => 'inner' },
+ { 'father.id' => 'child.father_id' }
+ ],
+ ]
+ },
+ );
+
+ # Equivalent SQL:
+ # SELECT child.* FROM person child
+ # INNER JOIN person father ON child.father_id = father.id
+
+=head2 page
+
+For a paged resultset, specifies which page to retrieve. Leave unset
+for an unpaged resultset.
+
+=head2 rows
+
+For a paged resultset, how many rows per page:
+
+ rows => 10
+
+Can also be used to simulate an SQL C<LIMIT>.
+
+=head2 group_by
+
+=head3 Arguments: (arrayref)
+
+A arrayref of columns to group by. Can include columns of joined tables.
+
+ group_by => [qw/ column1 column2 ... /]
+
+=head2 distinct
+
+Set to 1 to group by all columns.
+
+For more examples of using these attributes, see
+L<DBIx::Class::Manual::Cookbook>.
+
+=cut
1;