use strict;
use warnings;
-use base qw/Class::Data::Inheritable DBIx::Class::SQL/;
+use base qw/DBIx::Class::Row/;
-__PACKAGE__->mk_classdata('_primaries' => {});
+=head1 NAME
-sub _ident_cond {
- my ($class) = @_;
- return join(" AND ", map { "$_ = ?" } keys %{$class->_primaries});
+DBIx::Class::PK - Primary Key class
+
+=head1 SYNOPSIS
+
+=head1 DESCRIPTION
+
+This class contains methods for handling primary keys and methods
+depending on them.
+
+=head1 METHODS
+
+=cut
+
+=head2 id
+
+Returns the primary key(s) for a row. Can't be called as
+a class method.
+
+=cut
+
+sub id {
+ my ($self) = @_;
+ $self->throw_exception( "Can't call id() as a class method" )
+ unless ref $self;
+ my @id_vals = $self->_ident_values;
+ return (wantarray ? @id_vals : $id_vals[0]);
}
sub _ident_values {
+ my ($self, $use_storage_state) = @_;
+
+ my (@ids, @missing);
+
+ for ($self->_pri_cols) {
+ push @ids, ($use_storage_state and exists $self->{_column_data_in_storage}{$_})
+ ? $self->{_column_data_in_storage}{$_}
+ : $self->get_column($_)
+ ;
+ push @missing, $_ if (! defined $ids[-1] and ! $self->has_column_loaded ($_) );
+ }
+
+ if (@missing && $self->in_storage) {
+ $self->throw_exception (
+ 'Unable to uniquely identify row object with missing PK columns: '
+ . join (', ', @missing )
+ );
+ }
+
+ return @ids;
+}
+
+=head2 ID
+
+Returns a unique id string identifying a row object by primary key.
+Used by L<DBIx::Class::CDBICompat::LiveObjectIndex> and
+L<DBIx::Class::ObjectCache>.
+
+=over
+
+=item WARNING
+
+The default C<_create_ID> method used by this function orders the returned
+values by the alphabetical order of the primary column names, B<unlike>
+the L</id> method, which follows the same order in which columns were fed
+to L<DBIx::Class::ResultSource/set_primary_key>.
+
+=back
+
+=cut
+
+sub ID {
my ($self) = @_;
- return (map { $self->{_column_data}{$_} } keys %{$self->_primaries});
+ $self->throw_exception( "Can't call ID() as a class method" )
+ unless ref $self;
+ return undef unless $self->in_storage;
+ return $self->_create_ID(%{$self->ident_condition});
}
-sub set_primary_key {
- my ($class, @cols) = @_;
- my %pri;
- $pri{$_} = {} for @cols;
- $class->_primaries(\%pri);
+sub _create_ID {
+ my ($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 retrieve {
- my ($class, @vals) = @_;
- my @pk = keys %{$class->_primaries};
- die "Can't retrieve unless primary columns are defined" unless @pk;
- my $query;
- if (ref $vals[0] eq 'HASH') {
- $query = $vals[0];
- } elsif (@pk == @vals) {
- my $ret = ($class->retrieve_from_sql($class->_ident_cond, @vals))[0];
- #warn "$class: ".join(', ', %{$ret->{_column_data}});
- return $ret;
- } else {
- $query = {@vals};
- }
- die "Can't retrieve unless all primary keys are specified"
- unless (keys %$query >= @pk); # If we check 'em we run afoul of uc/lc
- # column names etc. Not sure what to do yet
- my $ret = ($class->search($query))[0];
- #warn "$class: ".join(', ', %{$ret->{_column_data}});
- return $ret;
+=head2 ident_condition
+
+ my $cond = $result_source->ident_condition();
+
+ my $cond = $result_source->ident_condition('alias');
+
+Produces a condition hash to locate a row based on the primary key(s).
+
+=cut
+
+sub ident_condition {
+ shift->_mk_ident_cond(@_);
}
-sub discard_changes {
- my ($self) = @_;
- delete $self->{_dirty_columns};
- $_[0] = $self->retrieve($self->id);
+sub _storage_ident_condition {
+ shift->_mk_ident_cond(shift, 1);
}
-sub id {
- my ($self) = @_;
- die "Can't call id() as a class method" unless ref $self;
- my @pk = $self->_ident_values;
- return (wantarray ? @pk : $pk[0]);
+sub _mk_ident_cond {
+ my ($self, $alias, $use_storage_state) = @_;
+
+ my @pks = $self->_pri_cols;
+ my @vals = $self->_ident_values($use_storage_state);
+
+ my (%cond, @undef);
+ my $prefix = defined $alias ? $alias.'.' : '';
+ for my $col (@pks) {
+ if (! defined ($cond{$prefix.$col} = shift @vals) ) {
+ push @undef, $col;
+ }
+ }
+
+ if (@undef && $self->in_storage) {
+ $self->throw_exception (
+ 'Unable to construct row object identity condition due to NULL PK columns: '
+ . join (', ', @undef)
+ );
+ }
+
+ return \%cond;
}
1;
+
+=head1 AUTHOR AND CONTRIBUTORS
+
+See L<AUTHOR|DBIx::Class/AUTHOR> and L<CONTRIBUTORS|DBIx::Class/CONTRIBUTORS> in DBIx::Class
+
+=head1 LICENSE
+
+You may distribute this code under the same terms as Perl itself.
+
+=cut
+
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