package # hide from PAUSE
DBIx::Class::Relationship::ManyToMany;
use strict;
use warnings;
use Sub::Name ();
sub many_to_many {
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';
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) {
warn "***************************************************************************\n".
"The many-to-many relationship $meth is trying to create a utility method called $_. This will overwrite the existing method on $class. You almost certainly want to rename your method or the many-to-many relationship, as your method will not be callable (it will use the one from the relationship instead.) YOU HAVE BEEN WARNED\n".
"***************************************************************************\n"
if $class->can($_);
}
$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 = $f_rel_rs->create($_[0]);
} else {
$obj = $_[0];
}
} else {
$obj = $f_rel_rs->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] } : @_);
$self->search_related($rel, {})->delete;
$self->$add_meth($_) 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;
};
}
}
1;