-package DBIx::Class::Relationship::ManyToMany;
+package # hide from PAUSE
+ DBIx::Class::Relationship::ManyToMany;
use strict;
use warnings;
+use Carp::Clan qw/^DBIx::Class/;
+use Sub::Name ();
+
+our %_pod_inherit_config =
+ (
+ class_map => { 'DBIx::Class::Relationship::ManyToMany' => 'DBIx::Class::Relationship' }
+ );
+
sub many_to_many {
- my ($class, $meth, $rel_class, $f_class) = @_;
-
- eval "require $f_class";
-
+ my ($class, $meth, $rel, $f_rel, $rel_attrs) = @_;
+
+ $class->throw_exception(
+ "missing relation in many-to-many"
+ ) unless $rel;
+
+ $class->throw_exception(
+ "missing foreign relation in many-to-many"
+ ) unless $f_rel;
+
{
no strict 'refs';
no warnings 'redefine';
- *{"${class}::${meth}"} =
- sub { shift->search_related($rel_class)->search_related($f_class, @_); };
+
+ my $add_meth = "add_to_${meth}";
+ my $remove_meth = "remove_from_${meth}";
+ my $set_meth = "set_${meth}";
+ my $rs_meth = "${meth}_rs";
+
+ for ($add_meth, $remove_meth, $set_meth, $rs_meth) {
+ if ( $class->can ($_) ) {
+ carp (<<"EOW") unless $ENV{DBIC_OVERWRITE_HELPER_METHODS_OK};
+
+***************************************************************************
+The many-to-many relationship '$meth' is trying to create a utility method
+called $_.
+This will completely overwrite one such already existing method on class
+$class.
+
+You almost certainly want to rename your method or the many-to-many
+relationship, as the functionality of the original method will not be
+accessible anymore.
+
+To disable this warning set to a true value the environment variable
+DBIC_OVERWRITE_HELPER_METHODS_OK
+
+***************************************************************************
+EOW
+ }
+ }
+
+ $rel_attrs->{alias} ||= $f_rel;
+
+ my $rs_meth_name = join '::', $class, $rs_meth;
+ *$rs_meth_name = Sub::Name::subname $rs_meth_name, sub {
+ my $self = shift;
+ my $attrs = @_ > 1 && ref $_[$#_] eq 'HASH' ? pop(@_) : {};
+ my @args = ($f_rel, @_ > 0 ? @_ : undef, { %{$rel_attrs||{}}, %$attrs });
+ my $rs = $self->search_related($rel)->search_related(
+ $f_rel, @_ > 0 ? @_ : undef, { %{$rel_attrs||{}}, %$attrs }
+ );
+ return $rs;
+ };
+
+ my $meth_name = join '::', $class, $meth;
+ *$meth_name = Sub::Name::subname $meth_name, sub {
+ my $self = shift;
+ my $rs = $self->$rs_meth( @_ );
+ return (wantarray ? $rs->all : $rs);
+ };
+
+ my $add_meth_name = join '::', $class, $add_meth;
+ *$add_meth_name = Sub::Name::subname $add_meth_name, sub {
+ my $self = shift;
+ @_ > 0 or $self->throw_exception(
+ "${add_meth} needs an object or hashref"
+ );
+ my $source = $self->result_source;
+ my $schema = $source->schema;
+ my $rel_source_name = $source->relationship_info($rel)->{source};
+ my $rel_source = $schema->resultset($rel_source_name)->result_source;
+ my $f_rel_source_name = $rel_source->relationship_info($f_rel)->{source};
+ my $f_rel_rs = $schema->resultset($f_rel_source_name)->search({}, $rel_attrs||{});
+
+ my $obj;
+ if (ref $_[0]) {
+ if (ref $_[0] eq 'HASH') {
+ $obj = $f_rel_rs->find_or_create($_[0]);
+ } else {
+ $obj = $_[0];
+ }
+ } else {
+ $obj = $f_rel_rs->find_or_create({@_});
+ }
+
+ my $link_vals = @_ > 1 && ref $_[$#_] eq 'HASH' ? pop(@_) : {};
+ my $link = $self->search_related($rel)->new_result($link_vals);
+ $link->set_from_related($f_rel, $obj);
+ $link->insert();
+ return $obj;
+ };
+
+ my $set_meth_name = join '::', $class, $set_meth;
+ *$set_meth_name = Sub::Name::subname $set_meth_name, sub {
+ my $self = shift;
+ @_ > 0 or $self->throw_exception(
+ "{$set_meth} needs a list of objects or hashrefs"
+ );
+ my @to_set = (ref($_[0]) eq 'ARRAY' ? @{ $_[0] } : @_);
+ # if there is a where clause in the attributes, ensure we only delete
+ # rows that are within the where restriction
+ if ($rel_attrs && $rel_attrs->{where}) {
+ $self->search_related( $rel, $rel_attrs->{where},{join => $f_rel})->delete;
+ } else {
+ $self->search_related( $rel, {} )->delete;
+ }
+ # add in the set rel objects
+ $self->$add_meth($_, ref($_[1]) ? $_[1] : {}) for (@to_set);
+ };
+
+ my $remove_meth_name = join '::', $class, $remove_meth;
+ *$remove_meth_name = Sub::Name::subname $remove_meth_name, sub {
+ my $self = shift;
+ @_ > 0 && ref $_[0] ne 'HASH'
+ or $self->throw_exception("${remove_meth} needs an object");
+ my $obj = shift;
+ my $rel_source = $self->search_related($rel)->result_source;
+ my $cond = $rel_source->relationship_info($f_rel)->{cond};
+ my $link_cond = $rel_source->_resolve_condition(
+ $cond, $obj, $f_rel
+ );
+ $self->search_related($rel, $link_cond)->delete;
+ };
+
}
}