package DBIx::Class::PK;
use strict;
use warnings;
use base qw/DBIx::Class::Row/;
=head1 NAME
DBIx::Class::PK - Primary Key class
=head1 SYNOPSIS
=head1 DESCRIPTION
This class contains methods for handling primary keys and methods
depending on them.
=head1 METHODS
=cut
sub _ident_cond {
my ($class) = @_;
return join(" AND ", map { "$_ = ?" } $class->primary_columns);
}
sub _ident_values {
my ($self) = @_;
return (map { $self->{_column_data}{$_} } $self->primary_columns);
}
=head2 discard_changes
Re-selects the row from the database, losing any changes that had
been made.
=cut
sub discard_changes {
my ($self) = @_;
delete $self->{_dirty_columns};
return unless $self->in_storage; # Don't reload if we aren't real!
my ($reload) = $self->result_source->resultset->find(map { $self->$_ } $self->primary_columns);
unless ($reload) { # If we got deleted in the mean-time
$self->in_storage(0);
return $self;
}
delete @{$self}{keys %$self};
@{$self}{keys %$reload} = values %$reload;
return $self;
}
=head2 id
Returns the primary key(s) for a row. Can't be called as
a class method.
=cut
sub id {
my ($self) = @_;
$self->throw_exception( "Can't call id() as a class method" ) unless ref $self;
my @pk = $self->_ident_values;
return (wantarray ? @pk : $pk[0]);
}
=head2 ID
Returns a unique id string identifying a row object by primary key.
Used by L<DBIx::Class::CDBICompat::LiveObjectIndex> and
L<DBIx::Class::ObjectCache>.
=cut
sub ID {
my ($self) = @_;
$self->throw_exception( "Can't call ID() as a class method" ) unless ref $self;
return undef unless $self->in_storage;
return $self->_create_ID(map { $_ => $self->{_column_data}{$_} } $self->primary_columns);
}
sub _create_ID {
my ($self,%vals) = @_;
return undef unless 0 == grep { !defined } values %vals;
return join '|', ref $self || $self, $self->result_source->name, map { $_ . '=' . $vals{$_} } sort keys %vals;
}
sub ident_condition {
my ($self, $alias) = @_;
my %cond;
$cond{(defined $alias ? "${alias}.$_" : $_)} = $self->get_column($_) for $self->primary_columns;
return \%cond;
}
1;
=head1 AUTHORS
Matt S. Trout <mst@shadowcatsystems.co.uk>
=head1 LICENSE
You may distribute this code under the same terms as Perl itself.
=cut