X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FPK.pm;h=0ef470b336af96abd656b776cb5c391733e4e4b8;hb=dc7d89911b7bb98c30208cf73af522a99998dcd6;hp=5be483325f8de54751f396d555394a511075da3d;hpb=d4daee7b54e38e4b3d3d0a77759bddc1a4ede6e5;p=dbsrgits%2FDBIx-Class.git

diff --git a/lib/DBIx/Class/PK.pm b/lib/DBIx/Class/PK.pm
index 5be4833..0ef470b 100644
--- a/lib/DBIx/Class/PK.pm
+++ b/lib/DBIx/Class/PK.pm
@@ -5,6 +5,9 @@ use warnings;
 
 use base qw/DBIx::Class::Row/;
 
+use DBIx::Class::_Util 'fail_on_internal_call';
+use namespace::clean;
+
 =head1 NAME
 
 DBIx::Class::PK - Primary Key class
@@ -20,66 +23,65 @@ depending on them.
 
 =cut
 
-sub _ident_values {
-  my ($self) = @_;
-  return (map { $self->{_column_data}{$_} } $self->primary_columns);
-}
-
-=head2 discard_changes ($attrs)
-
-Re-selects the row from the database, losing any changes that had
-been made.
-
-This method can also be used to refresh from storage, retrieving any
-changes made since the row was last read from storage.
+=head2 id
 
-$attrs is expected to be a hashref of attributes suitable for passing as the
-second argument to $resultset->search($cond, $attrs);
+Returns the primary key(s) for a row. Can't be called as
+a class method.
 
 =cut
 
-sub discard_changes {
-  my ($self, $attrs) = @_;
-  delete $self->{_dirty_columns};
-  return unless $self->in_storage; # Don't reload if we aren't real!
+sub id :DBIC_method_is_indirect_sugar {
+  DBIx::Class::_ENV_::ASSERT_NO_INTERNAL_INDIRECT_CALLS and fail_on_internal_call;
 
-  if( my $current_storage = $self->get_from_storage($attrs)) {
+  $_[0]->throw_exception( "Can't call id() as a class method" )
+    unless ref $_[0];
 
-    # Set $self to the current.
-  	%$self = %$current_storage;
-
-    # Avoid a possible infinite loop with
-    # sub DESTROY { $_[0]->discard_changes }
-    bless $current_storage, 'Do::Not::Exist';
-
-    return $self;  	
-  } else {
-    $self->in_storage(0);
-    return $self;  	
-  }
+  wantarray
+    ? $_[0]->_ident_values
+    : ($_[0]->_ident_values)[0]   # FIXME - horrible horrible legacy crap
+  ;
 }
 
-=head2 id
+sub _ident_values {
+  my ($self, $use_storage_state) = @_;
 
-Returns the primary key(s) for a row. Can't be called as
-a class method.
+  my (@ids, @missing);
 
-=cut
+  for ($self->result_source->_pri_cols_or_die) {
+    push @ids, ($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 ! $self->has_column_loaded ($_) );
+  }
 
-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]);
+  if (@missing && $self->in_storage) {
+    $self->throw_exception (
+      'Unable to uniquely identify result object with missing PK columns: '
+      . join (', ', @missing )
+    );
+  }
+
+  return @ids;
 }
 
 =head2 ID
 
-Returns a unique id string identifying a row object by primary key.
+Returns a unique id string identifying a result 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 {
@@ -87,13 +89,12 @@ sub ID {
   $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);
+  return $self->_create_ID(%{$self->ident_condition});
 }
 
 sub _create_ID {
-  my ($self,%vals) = @_;
-  return undef unless 0 == grep { !defined } values %vals;
+  my ($self, %vals) = @_;
+  return undef if grep { !defined } values %vals;
   return join '|', ref $self || $self, $self->result_source->name,
     map { $_ . '=' . $vals{$_} } sort keys %vals;
 }
@@ -109,22 +110,48 @@ Produces a condition hash to locate a row based on the primary key(s).
 =cut
 
 sub ident_condition {
-  my ($self, $alias) = @_;
-  my %cond;
+  shift->_mk_ident_cond(@_);
+}
+
+sub _storage_ident_condition {
+  shift->_mk_ident_cond(shift, 1);
+}
+
+sub _mk_ident_cond {
+  my ($self, $alias, $use_storage_state) = @_;
+
+  my @pks = $self->result_source->_pri_cols_or_die;
+  my @vals = $self->_ident_values($use_storage_state);
+
+  my (%cond, @undef);
   my $prefix = defined $alias ? $alias.'.' : '';
-  $cond{$prefix.$_} = $self->get_column($_) for $self->primary_columns;
+  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 result object identity condition due to NULL PK columns: '
+      . join (', ', @undef)
+    );
+  }
+
   return \%cond;
 }
 
-1;
+=head1 FURTHER QUESTIONS?
 
-=head1 AUTHORS
+Check the list of L<additional DBIC resources|DBIx::Class/GETTING HELP/SUPPORT>.
 
-Matt S. Trout <mst@shadowcatsystems.co.uk>
+=head1 COPYRIGHT AND LICENSE
 
-=head1 LICENSE
-
-You may distribute this code under the same terms as Perl itself.
+This module is free software L<copyright|DBIx::Class/COPYRIGHT AND LICENSE>
+by the L<DBIx::Class (DBIC) authors|DBIx::Class/AUTHORS>. You can
+redistribute it and/or modify it under the same terms as the
+L<DBIx::Class library|DBIx::Class/COPYRIGHT AND LICENSE>.
 
 =cut
 
+1;