use warnings;
use DBIx::Class::ResultSet;
-
-use Carp qw/croak/;
+use Carp::Clan qw/^DBIx::Class/;
+use Storable;
use base qw/DBIx::Class/;
__PACKAGE__->load_components(qw/AccessorGroup/);
__PACKAGE__->mk_group_accessors('simple' =>
- qw/_ordered_columns _columns _primaries name resultset_class result_class schema from _relationships/);
+ qw/_ordered_columns _columns _primaries _unique_constraints name resultset_attributes schema from _relationships/);
+__PACKAGE__->mk_group_accessors('component_class' => qw/resultset_class result_class/);
=head1 NAME
sub new {
my ($class, $attrs) = @_;
$class = ref $class if ref $class;
- my $new = bless({ %{$attrs || {}} }, $class);
+ my $new = bless({ %{$attrs || {}}, _resultset => undef }, $class);
$new->{resultset_class} ||= 'DBIx::Class::ResultSet';
- $new->{_ordered_columns} ||= [];
- $new->{_columns} ||= {};
- $new->{_relationships} ||= {};
+ $new->{resultset_attributes} = { %{$new->{resultset_attributes} || {}} };
+ $new->{_ordered_columns} = [ @{$new->{_ordered_columns}||[]}];
+ $new->{_columns} = { %{$new->{_columns}||{}} };
+ $new->{_relationships} = { %{$new->{_relationships}||{}} };
$new->{name} ||= "!!NAME NOT SET!!";
+ $new->{_columns_info_loaded} ||= 0;
return $new;
}
-sub add_columns {
- my ($self, @cols) = @_;
- $self->_ordered_columns( \@cols )
- if !$self->_ordered_columns;
- my @added;
- my $columns = $self->_columns;
- while (my $col = shift @cols) {
-
- my $column_info = ref $cols[0] ? shift(@cols) : {};
- # If next entry is { ... } use that for the column info, if not
- # use an empty hashref
-
- push(@added, $col) unless exists $columns->{$col};
-
- $columns->{$col} = $column_info;
- }
- push @{ $self->_ordered_columns }, @added;
- return $self;
-}
-
-*add_column = \&add_columns;
+=pod
=head2 add_columns
Adds columns to the result source. If supplied key => hashref pairs uses
the hashref as the column_info for that column.
+Repeated calls of this method will add more columns, not replace them.
+
+The contents of the column_info are not set in stone, the following
+keys are currently recognised/used by DBIx::Class.
+
+=over 4
+
+=item accessor
+
+Use this to set the name of the accessor for this column. If unset,
+the name of the column will be used.
+
+=item data_type
+
+This contains the column type, it is automatically filled by the
+L<SQL::Translator::Producer::DBIx::Class::File> producer, and the
+L<DBIx::Class::Schema::Loader> module. If you do not enter the
+data_type, DBIx::Class will attempt to retrieve it from the
+database for you, using L<DBI>s column_info method. The values of this
+key are typically upper-cased.
+
+Currently there is no standard set of values for the data_type, use
+whatever your database(s) support.
+
+=item size
+
+The length of your column, if it is a column type that can have a size
+restriction. This is currently not used by DBIx::Class.
+
+=item is_nullable
+
+If the column is allowed to contain NULL values, set a true value
+(typically 1), here. This is currently not used by DBIx::Class.
+
+=item is_auto_increment
+
+Set this to a true value if this is a column that is somehow
+automatically filled. This is currently not used by DBIx::Class.
+
+=item is_foreign_key
+
+Set this to a true value if this column represents a key from a
+foreign table. This is currently not used by DBIx::Class.
+
+=item default_value
+
+Set this to the default value which will be inserted into this column
+by the database. Can contain either values or functions. This is
+currently not used by DBIx::Class.
+
+=item sequence
+
+If your column is using a sequence to create it's values, set the name
+of the sequence here, to allow the values to be retrieved
+automatically by the L<DBIx::Class::PK::Auto> module. PK::Auto will
+attempt to retrieve the sequence name from the database, if this value
+is left unset.
+
+=back
+
=head2 add_column
$table->add_column('col' => \%info?);
=cut
-sub resultset {
- my $self = shift;
- return $self->resultset_class->new($self);
+sub add_columns {
+ my ($self, @cols) = @_;
+ $self->_ordered_columns(\@cols) unless $self->_ordered_columns;
+
+ my @added;
+ my $columns = $self->_columns;
+ while (my $col = shift @cols) {
+ # If next entry is { ... } use that for the column info, if not
+ # use an empty hashref
+ my $column_info = ref $cols[0] ? shift(@cols) : {};
+ push(@added, $col) unless exists $columns->{$col};
+ $columns->{$col} = $column_info;
+ }
+ push @{ $self->_ordered_columns }, @added;
+ return $self;
}
+*add_column = \&add_columns;
+
=head2 has_column
- if ($obj->has_column($col)) { ... }
-
+ if ($obj->has_column($col)) { ... }
+
Returns 1 if the source has a column of this name, 0 otherwise.
-
-=cut
+
+=cut
sub has_column {
my ($self, $column) = @_;
return exists $self->_columns->{$column};
}
-=head2 column_info
+=head2 column_info
- my $info = $obj->column_info($col);
+ my $info = $obj->column_info($col);
-Returns the column metadata hashref for a column.
-
-=cut
+Returns the column metadata hashref for a column. See the description
+of add_column for information on the contents of the hashref.
+
+=cut
sub column_info {
my ($self, $column) = @_;
- croak "No such column $column" unless exists $self->_columns->{$column};
- if ( (! $self->_columns->{$column}->{data_type})
- && $self->schema && $self->storage() ){
- my $info;
-############ eval for the case of storage without table
- eval{
- $info = $self->storage->columns_info_for ( $self->from() );
- };
- if ( ! $@ ){
- for my $col ( keys %{$self->_columns} ){
- for my $i ( keys %{$info->{$col}} ){
- $self->_columns()->{$col}->{$i} = $info->{$col}->{$i};
- }
- }
+ $self->throw_exception("No such column $column")
+ unless exists $self->_columns->{$column};
+ #warn $self->{_columns_info_loaded}, "\n";
+ if ( ! $self->_columns->{$column}{data_type}
+ and ! $self->{_columns_info_loaded}
+ and $self->schema and $self->storage )
+ {
+ $self->{_columns_info_loaded}++;
+ my $info;
+ # eval for the case of storage without table
+ eval { $info = $self->storage->columns_info_for($self->from) };
+ unless ($@) {
+ foreach my $col ( keys %{$self->_columns} ) {
+ foreach my $i ( keys %{$info->{$col}} ) {
+ $self->_columns->{$col}{$i} = $info->{$col}{$i};
+ }
}
+ }
}
return $self->_columns->{$column};
}
my @column_names = $obj->columns;
Returns all column names in the order they were declared to add_columns
-
-=cut
+
+=cut
sub columns {
- croak "columns() is a read-only accessor, did you mean add_columns()?" if (@_ > 1);
- return @{shift->{_ordered_columns}||[]};
+ my $self = shift;
+ $self->throw_exception("columns() is a read-only accessor, did you mean add_columns()?") if (@_ > 1);
+ return @{$self->{_ordered_columns}||[]};
}
-=head2 set_primary_key(@cols)
-
+=head2 set_primary_key
+
+=head3 Arguments: (@cols)
+
Defines one or more columns as primary key for this source. Should be
called after C<add_columns>.
-
-=cut
+
+Additionally, defines a unique constraint named C<primary>.
+
+The primary key columns are used by L<DBIx::Class::PK::Auto> to
+retrieve automatically created values from the database.
+
+=cut
sub set_primary_key {
my ($self, @cols) = @_;
# check if primary key columns are valid columns
- for (@cols) {
- $self->throw("No such column $_ on table ".$self->name)
- unless $self->has_column($_);
+ foreach my $col (@cols) {
+ $self->throw_exception("No such column $col on table " . $self->name)
+ unless $self->has_column($col);
}
$self->_primaries(\@cols);
+
+ $self->add_unique_constraint(primary => \@cols);
}
-=head2 primary_columns
-
+=head2 primary_columns
+
Read-only accessor which returns the list of primary keys.
-=cut
+=cut
sub primary_columns {
return @{shift->_primaries||[]};
}
+=head2 add_unique_constraint
+
+Declare a unique constraint on this source. Call once for each unique
+constraint. Unique constraints are used when you call C<find> on a
+L<DBIx::Class::ResultSet>, only columns in the constraint are searched,
+
+ # For e.g. UNIQUE (column1, column2)
+ __PACKAGE__->add_unique_constraint(constraint_name => [ qw/column1 column2/ ]);
+
+=cut
+
+sub add_unique_constraint {
+ my ($self, $name, $cols) = @_;
+
+ foreach my $col (@$cols) {
+ $self->throw_exception("No such column $col on table " . $self->name)
+ unless $self->has_column($col);
+ }
+
+ my %unique_constraints = $self->unique_constraints;
+ $unique_constraints{$name} = $cols;
+ $self->_unique_constraints(\%unique_constraints);
+}
+
+=head2 unique_constraints
+
+Read-only accessor which returns the list of unique constraints on this source.
+
+=cut
+
+sub unique_constraints {
+ return %{shift->_unique_constraints||{}};
+}
+
=head2 from
Returns an expression of the source to be supplied to storage to specify
=head2 storage
-Returns the storage handle for the current schema
+Returns the storage handle for the current schema.
+
+See also: L<DBIx::Class::Storage>
=cut
(for simple schemas this is usally either Some::Namespace::Foo or just Foo)
The condition needs to be an SQL::Abstract-style representation of the join
-between the tables. For example, if you're creating a rel from Foo to Bar,
-
- { 'foreign.foo_id' => 'self.id' }
-
-will result in the JOIN clause
-
- foo me JOIN bar bar ON bar.foo_id = me.id
-
+between the tables. For example, if you're creating a rel from Author to Book,
+
+ { 'foreign.author_id' => 'self.id' }
+
+will result in the JOIN clause
+
+ author me JOIN book foreign ON foreign.author_id = me.id
+
You can specify as many foreign => self mappings as necessary.
-Valid attributes are as follows:
-
-=over 4
-
-=item join_type
-
-Explicitly specifies the type of join to use in the relationship. Any SQL
-join type is valid, e.g. C<LEFT> or C<RIGHT>. It will be placed in the SQL
-command immediately before C<JOIN>.
-
-=item proxy
-
-An arrayref containing a list of accessors in the foreign class to proxy in
-the main class. If, for example, you do the following:
-
- __PACKAGE__->might_have(bar => 'Bar', undef, { proxy => qw[/ margle /] });
-
-Then, assuming Bar has an accessor named margle, you can do:
-
- my $obj = Foo->find(1);
- $obj->margle(10); # set margle; Bar object is created if it doesn't exist
-
-=item accessor
-
-Specifies the type of accessor that should be created for the relationship.
-Valid values are C<single> (for when there is only a single related object),
-C<multi> (when there can be many), and C<filter> (for when there is a single
-related object, but you also want the relationship accessor to double as
-a column accessor). For C<multi> accessors, an add_to_* method is also
-created, which calls C<create_related> for the relationship.
-
+Valid attributes are as follows:
+
+=over 4
+
+=item join_type
+
+Explicitly specifies the type of join to use in the relationship. Any
+SQL join type is valid, e.g. C<LEFT> or C<RIGHT>. It will be placed in
+the SQL command immediately before C<JOIN>.
+
+=item proxy
+
+An arrayref containing a list of accessors in the foreign class to
+proxy in the main class. If, for example, you do the following:
+
+ __PACKAGE__->might_have(bar => 'Bar', undef, { proxy => [ qw/margle/] });
+
+Then, assuming Bar has an accessor named margle, you can do:
+
+ my $obj = Foo->find(1);
+ $obj->margle(10); # set margle; Bar object is created if it doesn't exist
+
+=item accessor
+
+Specifies the type of accessor that should be created for the
+relationship. Valid values are C<single> (for when there is only a single
+related object), C<multi> (when there can be many), and C<filter> (for
+when there is a single related object, but you also want the relationship
+accessor to double as a column accessor). For C<multi> accessors, an
+add_to_* method is also created, which calls C<create_related> for the
+relationship.
+
=back
=cut
sub add_relationship {
my ($self, $rel, $f_source_name, $cond, $attrs) = @_;
- croak "Can't create relationship without join condition" unless $cond;
+ $self->throw_exception("Can't create relationship without join condition") unless $cond;
$attrs ||= {};
my %rels = %{ $self->_relationships };
if ($@) { # If the resolve failed, back out and re-throw the error
delete $rels{$rel}; #
$self->_relationships(\%rels);
- croak "Error creating relationship $rel: $@";
+ $self->throw_exception("Error creating relationship $rel: $@");
}
1;
}
-=head2 relationships()
+=head2 relationships
Returns all valid relationship names for this source
return keys %{shift->_relationships};
}
-=head2 relationship_info($relname)
+=head2 relationship_info
+
+=head3 Arguments: ($relname)
Returns the relationship information for the specified relationship name
return $self->_relationships->{$rel};
}
-=head2 has_relationship($rel)
+=head2 has_relationship
+
+=head3 Arguments: ($rel)
Returns 1 if the source has a relationship of this name, 0 otherwise.
-
-=cut
+
+=cut
sub has_relationship {
my ($self, $rel) = @_;
return exists $self->_relationships->{$rel};
}
-=head2 resolve_join($relation)
+=head2 resolve_join
+
+=head3 Arguments: ($relation)
Returns the join structure required for the related result source
=cut
sub resolve_join {
- my ($self, $join, $alias) = @_;
+ my ($self, $join, $alias, $seen) = @_;
+ $seen ||= {};
if (ref $join eq 'ARRAY') {
- return map { $self->resolve_join($_, $alias) } @$join;
+ return map { $self->resolve_join($_, $alias, $seen) } @$join;
} elsif (ref $join eq 'HASH') {
- return map { $self->resolve_join($_, $alias),
- $self->related_source($_)->resolve_join($join->{$_}, $_) }
- keys %$join;
+ return
+ map {
+ my $as = ($seen->{$_} ? $_.'_'.($seen->{$_}+1) : $_);
+ ($self->resolve_join($_, $alias, $seen),
+ $self->related_source($_)->resolve_join($join->{$_}, $as, $seen));
+ } keys %$join;
} elsif (ref $join) {
- croak ("No idea how to resolve join reftype ".ref $join);
+ $self->throw_exception("No idea how to resolve join reftype ".ref $join);
} else {
+ my $count = ++$seen->{$join};
+ #use Data::Dumper; warn Dumper($seen);
+ my $as = ($count > 1 ? "${join}_${count}" : $join);
my $rel_info = $self->relationship_info($join);
- croak("No such relationship ${join}") unless $rel_info;
+ $self->throw_exception("No such relationship ${join}") unless $rel_info;
my $type = $rel_info->{attrs}{join_type} || '';
- return [ { $join => $self->related_source($join)->from,
+ return [ { $as => $self->related_source($join)->from,
-join_type => $type },
- $self->resolve_condition($rel_info->{cond}, $join, $alias) ];
+ $self->resolve_condition($rel_info->{cond}, $as, $alias) ];
}
}
-=head2 resolve_condition($cond, $rel, $alias|$object)
+=head2 resolve_condition
+
+=head3 Arguments: ($cond, $as, $alias|$object)
Resolves the passed condition to a concrete query fragment. If given an alias,
returns a join condition; if given an object, inverts that object to produce
=cut
sub resolve_condition {
- my ($self, $cond, $rel, $for) = @_;
+ my ($self, $cond, $as, $for) = @_;
#warn %$cond;
if (ref $cond eq 'HASH') {
my %ret;
while (my ($k, $v) = each %{$cond}) {
# XXX should probably check these are valid columns
- $k =~ s/^foreign\.// || croak "Invalid rel cond key ${k}";
- $v =~ s/^self\.// || croak "Invalid rel cond val ${v}";
+ $k =~ s/^foreign\.// || $self->throw_exception("Invalid rel cond key ${k}");
+ $v =~ s/^self\.// || $self->throw_exception("Invalid rel cond val ${v}");
if (ref $for) { # Object
#warn "$self $k $for $v";
$ret{$k} = $for->get_column($v);
#warn %ret;
+ } elsif (ref $as) { # reverse object
+ $ret{$v} = $as->get_column($k);
} else {
- $ret{"${rel}.${k}"} = "${for}.${v}";
+ $ret{"${as}.${k}"} = "${for}.${v}";
}
}
return \%ret;
} elsif (ref $cond eq 'ARRAY') {
- return [ map { $self->resolve_condition($_, $rel, $for) } @$cond ];
+ return [ map { $self->resolve_condition($_, $as, $for) } @$cond ];
} else {
die("Can't handle this yet :(");
}
}
+=head2 resolve_prefetch
+
+=head3 Arguments: (hashref/arrayref/scalar)
+
+Accepts one or more relationships for the current source and returns an
+array of column names for each of those relationships. Column names are
+prefixed relative to the current source, in accordance with where they appear
+in the supplied relationships. Examples:
+
+ my $source = $schema->resultset('Tag')->source;
+ @columns = $source->resolve_prefetch( { cd => 'artist' } );
+
+ # @columns =
+ #(
+ # 'cd.cdid',
+ # 'cd.artist',
+ # 'cd.title',
+ # 'cd.year',
+ # 'cd.artist.artistid',
+ # 'cd.artist.name'
+ #)
+
+ @columns = $source->resolve_prefetch( qw[/ cd /] );
+
+ # @columns =
+ #(
+ # 'cd.cdid',
+ # 'cd.artist',
+ # 'cd.title',
+ # 'cd.year'
+ #)
+
+ $source = $schema->resultset('CD')->source;
+ @columns = $source->resolve_prefetch( qw[/ artist producer /] );
+
+ # @columns =
+ #(
+ # 'artist.artistid',
+ # 'artist.name',
+ # 'producer.producerid',
+ # 'producer.name'
+ #)
+
+=cut
+
+sub resolve_prefetch {
+ my ($self, $pre, $alias, $seen, $order, $collapse) = @_;
+ $seen ||= {};
+ #$alias ||= $self->name;
+ #warn $alias, Dumper $pre;
+ if( ref $pre eq 'ARRAY' ) {
+ return
+ map { $self->resolve_prefetch( $_, $alias, $seen, $order, $collapse ) }
+ @$pre;
+ }
+ elsif( ref $pre eq 'HASH' ) {
+ my @ret =
+ map {
+ $self->resolve_prefetch($_, $alias, $seen, $order, $collapse),
+ $self->related_source($_)->resolve_prefetch(
+ $pre->{$_}, "${alias}.$_", $seen, $order, $collapse)
+ } keys %$pre;
+ #die Dumper \@ret;
+ return @ret;
+ }
+ elsif( ref $pre ) {
+ $self->throw_exception(
+ "don't know how to resolve prefetch reftype ".ref($pre));
+ }
+ else {
+ my $count = ++$seen->{$pre};
+ my $as = ($count > 1 ? "${pre}_${count}" : $pre);
+ my $rel_info = $self->relationship_info( $pre );
+ $self->throw_exception( $self->name . " has no such relationship '$pre'" )
+ unless $rel_info;
+ my $as_prefix = ($alias =~ /^.*?\.(.+)$/ ? $1.'.' : '');
+ my $rel_source = $self->related_source($pre);
+
+ if (exists $rel_info->{attrs}{accessor}
+ && $rel_info->{attrs}{accessor} eq 'multi') {
+ $self->throw_exception(
+ "Can't prefetch has_many ${pre} (join cond too complex)")
+ unless ref($rel_info->{cond}) eq 'HASH';
+ my @key = map { (/^foreign\.(.+)$/ ? ($1) : ()); }
+ keys %{$rel_info->{cond}};
+ $collapse->{"${as_prefix}${pre}"} = \@key;
+ my @ord = (ref($rel_info->{attrs}{order_by}) eq 'ARRAY'
+ ? @{$rel_info->{attrs}{order_by}}
+ : (defined $rel_info->{attrs}{order_by}
+ ? ($rel_info->{attrs}{order_by})
+ : ()));
+ push(@$order, map { "${as}.$_" } (@key, @ord));
+ }
+
+ return map { [ "${as}.$_", "${as_prefix}${pre}.$_", ] }
+ $rel_source->columns;
+ #warn $alias, Dumper (\@ret);
+ #return @ret;
+ }
+}
+
+=head2 related_source
-=head2 related_source($relname)
+=head3 Arguments: ($relname)
-Returns the result source for the given relationship
+Returns the result source object for the given relationship
=cut
sub related_source {
my ($self, $rel) = @_;
+ if( !$self->has_relationship( $rel ) ) {
+ $self->throw_exception("No such relationship '$rel'");
+ }
return $self->schema->source($self->relationship_info($rel)->{source});
}
-1;
+=head2 resultset
+
+Returns a resultset for the given source, by calling:
+
+ $self->resultset_class->new($self, $self->resultset_attributes)
+
+=head2 resultset_class
+
+Set the class of the resultset, this is useful if you want to create your
+own resultset methods. Create your own class derived from
+L<DBIx::Class::ResultSet>, and set it here.
+
+=head2 resultset_attributes
+
+Specify here any attributes you wish to pass to your specialised resultset.
+
+=cut
+
+sub resultset {
+ my $self = shift;
+ $self->throw_exception('resultset does not take any arguments. If you want another resultset, call it on the schema instead.') if scalar @_;
+ return $self->{_resultset} if ref $self->{_resultset} eq $self->resultset_class;
+ return $self->{_resultset} = $self->resultset_class->new($self, $self->{resultset_attributes});
+}
+
+=head2 throw_exception
+
+See throw_exception in L<DBIx::Class::Schema>.
+
+=cut
+
+sub throw_exception {
+ my $self = shift;
+ if (defined $self->schema) {
+ $self->schema->throw_exception(@_);
+ } else {
+ croak(@_);
+ }
+}
+
=head1 AUTHORS
projects / dbsrgits/DBIx-Class.git / blobdiff