=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);
+ $obj->margle(10); # set margle; Bar object is created if it doesn't exist
+
+=item accessor
+
+Specifies the type of accessor that should be created for the relationship.
+Valid values are C<single> (for when there is only a single related object),
+C<multi> (when there can be many), and C<filter> (for when there is a single
+related object, but you also want the relationship accessor to double as
+a column accessor). For C<multi> accessors, an add_to_* method is also
+created, which calls C<create_related> for the relationship.
+
+=back
+
=cut
sub add_relationship {
}
sub _cond_key {
- my ($self, $attrs, $key) = @_;
+ my ($self, $attrs, $key, $alias) = @_;
my $action = $attrs->{_action} || '';
if ($action eq 'convert') {
unless ($key =~ s/^foreign\.//) {
$self->throw("Unable to convert relationship to WHERE clause: invalid key ${key}");
}
- return $key;
+ if (defined (my $alias = $attrs->{_aliases}{foreign})) {
+ return "${alias}.${key}";
+ } else {
+ return $key;
+ }
} elsif ($action eq 'join') {
return $key unless $key =~ /\./;
my ($type, $field) = split(/\./, $key);
return $self->next::method($attrs, $key, $value)
}
-=item search_related
+=head2 search_related
My::Table->search_related('relname', $cond, $attrs);
sub search_related {
my $self = shift;
- return $self->_query_related('search', @_);
-}
-
-=item count_related
-
- My::Table->count_related('relname', $cond, $attrs);
-
-=cut
-
-sub count_related {
- my $self = shift;
- return $self->_query_related('count', @_);
-}
-
-sub _query_related {
- my $self = shift;
- my $meth = shift;
my $rel = shift;
my $attrs = { };
if (@_ > 1 && ref $_[$#_] eq 'HASH') {
#warn $rel_obj->{class}." $meth $cond ".join(', ', @{$attrs->{bind}||[]});
delete $attrs->{_action};
return $self->resolve_class($rel_obj->{class}
- )->$meth($query, $attrs);
+ )->search($query, $attrs);
}
-=item create_related
+=head2 count_related
+
+ My::Table->count_related('relname', $cond, $attrs);
+
+=cut
+
+sub count_related {
+ my $self = shift;
+ return $self->search_related(@_)->count;
+}
+
+=head2 create_related
My::Table->create_related('relname', \%col_data);
sub create_related {
my $class = shift;
- return $class->new_related(@_)->insert;
+ my $rel = shift;
+ return $class->search_related($rel)->create(@_);
}
-=item new_related
+=head2 new_related
My::Table->new_related('relname', \%col_data);
sub new_related {
my ($self, $rel, $values, $attrs) = @_;
- $self->throw( "Can't call new_related as class method" )
- unless ref $self;
- $self->throw( "new_related needs a hash" )
- unless (ref $values eq 'HASH');
- my $rel_obj = $self->_relationships->{$rel};
- $self->throw( "No such relationship ${rel}" ) unless $rel_obj;
- $self->throw( "Can't abstract implicit create for ${rel}, condition not a hash" )
- unless ref $rel_obj->{cond} eq 'HASH';
- $attrs = { %{$rel_obj->{attrs}}, %{$attrs || {}}, _action => 'convert' };
-
- my %fields = %{$self->resolve_condition($rel_obj->{cond},$attrs)};
- $fields{$_} = $values->{$_} for keys %$values;
-
- return $self->resolve_class($rel_obj->{class})->new(\%fields);
+ return $self->search_related($rel)->new($values, $attrs);
}
-=item find_related
+=head2 find_related
My::Table->find_related('relname', @pri_vals | \%pri_vals);
sub find_related {
my $self = shift;
my $rel = shift;
- my $rel_obj = $self->_relationships->{$rel};
- $self->throw( "No such relationship ${rel}" ) unless $rel_obj;
- my ($cond) = $self->resolve_condition($rel_obj->{cond}, { _action => 'convert' });
- $self->throw( "Invalid query: @_" ) if (@_ > 1 && (@_ % 2 == 1));
- my $attrs = { };
- if (@_ > 1 && ref $_[$#_] eq 'HASH') {
- $attrs = { %{ pop(@_) } };
- }
- my $query = ((@_ > 1) ? {@_} : shift);
- $query = ($query ? { '-and' => [ $cond, $query ] } : $cond);
- return $self->resolve_class($rel_obj->{class})->find($query);
+ return $self->search_related($rel)->find(@_);
}
-=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.git / blobdiff