use strict;
use warnings;
-use base qw/Class::Data::Inheritable/;
+use base qw/DBIx::Class/;
__PACKAGE__->mk_classdata('_relationships', { } );
=head1 NAME
-DBIx::Class::Relationship - Inter-table relationships
+DBIx::Class::Relationship::Base - Inter-table relationships
=head1 SYNOPSIS
=head1 METHODS
-=over 4
-
-=item add_relationship
+=head2 add_relationship
__PACKAGE__->add_relationship('relname', 'Foreign::Class', $cond, $attrs);
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
+join between the tables. For example, if you're creating a rel from Foo to Bar,
{ 'foreign.foo_id' => 'self.id' }
-will result in a JOIN clause like
+will result in the JOIN clause
foo me JOIN bar bar ON bar.foo_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);
+ $obj->margle(10); # set margle; Bar object is created if it doesn't exist
+
+=item accessor
+
+Specifies the type of accessor that should be created for the relationship.
+Valid values are C<single> (for when there is only a single related object),
+C<multi> (when there can be many), and C<filter> (for when there is a single
+related object, but you also want the relationship accessor to double as
+a column accessor). For C<multi> accessors, an add_to_* method is also
+created, which calls C<create_related> for the relationship.
+
+=back
+
=cut
sub add_relationship {
my ($class, $rel, $f_class, $cond, $attrs) = @_;
die "Can't create relationship without join condition" unless $cond;
$attrs ||= {};
- eval "use $f_class;";
+ eval "require $f_class;";
+ if ($@) {
+ $class->throw($@) unless $@ =~ /Can't locate/;
+ }
my %rels = %{ $class->_relationships };
$rels{$rel} = { class => $f_class,
cond => $cond,
attrs => $attrs };
$class->_relationships(\%rels);
- #warn %{$f_class->_columns};
- return unless eval { %{$f_class->_columns}; }; # Foreign class not loaded
+ return unless eval { $f_class->can('columns'); }; # Foreign class not loaded
eval { $class->_resolve_join($rel, 'me') };
if ($@) { # If the resolve failed, back out and re-throw the error
if (my $alias = $attrs->{_aliases}{$type}) {
my $class = $attrs->{_classes}{$alias};
$self->throw("Unknown column $field on $class as $alias")
- unless exists $class->_columns->{$field};
+ unless $class->has_column($field);
return join('.', $alias, $field);
} else {
$self->throw( "Unable to resolve type ${type}: only have aliases for ".
join(', ', keys %{$attrs->{_aliases} || {}}) );
}
}
- return $self->NEXT::ACTUAL::_cond_key($attrs, $key);
+ return $self->next::method($attrs, $key);
}
sub _cond_value {
unless ($value =~ s/^self\.//) {
$self->throw( "Unable to convert relationship to WHERE clause: invalid value ${value}" );
}
- unless ($self->_columns->{$value}) {
+ unless ($self->has_column($value)) {
$self->throw( "Unable to convert relationship to WHERE clause: no such accessor ${value}" );
}
return $self->get_column($value);
if (my $alias = $attrs->{_aliases}{$type}) {
my $class = $attrs->{_classes}{$alias};
$self->throw("Unknown column $field on $class as $alias")
- unless exists $class->_columns->{$field};
+ unless $class->has_column($field);
return join('.', $alias, $field);
} else {
$self->throw( "Unable to resolve type ${type}: only have aliases for ".
}
}
- return $self->NEXT::ACTUAL::_cond_value($attrs, $key, $value)
+ return $self->next::method($attrs, $key, $value)
}
-=item search_related
+=head2 search_related
My::Table->search_related('relname', $cond, $attrs);
return $self->_query_related('search', @_);
}
-=item count_related
+=head2 count_related
My::Table->count_related('relname', $cond, $attrs);
)->$meth($query, $attrs);
}
-=item create_related
+=head2 create_related
My::Table->create_related('relname', \%col_data);
return $class->new_related(@_)->insert;
}
-=item new_related
+=head2 new_related
My::Table->new_related('relname', \%col_data);
return $self->resolve_class($rel_obj->{class})->new(\%fields);
}
-=item find_related
+=head2 find_related
My::Table->find_related('relname', @pri_vals | \%pri_vals);
return $self->resolve_class($rel_obj->{class})->find($query);
}
-=item find_or_create_related
+=head2 find_or_create_related
My::Table->find_or_create_related('relname', \%col_data);
return $self->find_related(@_) || $self->create_related(@_);
}
-=item set_from_related
+=head2 set_from_related
My::Table->set_from_related('relname', $rel_obj);
return 1;
}
-=item update_from_related
+=head2 update_from_related
My::Table->update_from_related('relname', $rel_obj);
$self->update;
}
-=item delete_related
+=head2 delete_related
My::Table->delete_related('relname', $cond, $attrs);
1;
-=back
-
=head1 AUTHORS
Matt S. Trout <mst@shadowcatsystems.co.uk>
projects / dbsrgits/DBIx-Class-Historic.git / blobdiff