X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FPK.pm;h=c4d3b93944dcf88765ce95cfc8796b2036bc5775;hb=572338e0c6b2b119362ae59880813b0d5188c62f;hp=4889b637aa1e810ae9b6d3ca4a86e3090089ae86;hpb=fea3d0452969e98afc0296ba80f90a91ab7dc1be;p=dbsrgits%2FDBIx-Class.git

diff --git a/lib/DBIx/Class/PK.pm b/lib/DBIx/Class/PK.pm
index 4889b63..c4d3b93 100644
--- a/lib/DBIx/Class/PK.pm
+++ b/lib/DBIx/Class/PK.pm
@@ -2,11 +2,10 @@ package DBIx::Class::PK;
 
 use strict;
 use warnings;
-use Tie::IxHash;
 
 use base qw/DBIx::Class::Row/;
 
-=head1 NAME 
+=head1 NAME
 
 DBIx::Class::PK - Primary Key class
 
@@ -14,84 +13,113 @@ DBIx::Class::PK - Primary Key class
 
 =head1 DESCRIPTION
 
-This class contains methods for handling primary keys and methods 
+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
+=head2 id
 
-Re-selects the row from the database, losing any changes that had
-been made.
+Returns the primary key(s) for a row. Can't be called as
+a class method.
 
 =cut
 
-sub discard_changes {
+sub id {
   my ($self) = @_;
-  delete $self->{_dirty_columns};
-  return unless $self->in_storage; # Don't reload if we aren't real!
-  my ($reload) = $self->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;
+  $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]);
 }
 
-=head2 id
+sub _ident_values {
+  my ($self) = @_;
 
-Returns the primary key(s) for a row. Can't be called as
-a class method.
+  my (@ids, @missing);
 
-=cut
+  for ($self->_pri_cols) {
+    push @ids, $self->get_column($_);
+    push @missing, $_ if (! defined $ids[-1] and ! $self->has_column_loaded ($_) );
+  }
 
-sub id {
-  my ($self) = @_;
-  $self->throw( "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 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 
+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) = @_;
-  $self->throw( "Can't call ID() as a class method" ) unless ref $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);
+  return $self->_create_ID(%{$self->ident_condition});
 }
 
 sub _create_ID {
-  my ($class,%vals) = @_;
+  my ($self, %vals) = @_;
   return undef unless 0 == grep { !defined } values %vals;
-  $class = ref $class || $class;
-  return join '|', $class, map { $_ . '=' . $vals{$_} } sort keys %vals;    
+  return join '|', ref $self || $self, $self->result_source->name,
+    map { $_ . '=' . $vals{$_} } sort keys %vals;
 }
 
+=head2 ident_condition
+
+  my $cond = $result_source->ident_condition();
+
+  my $cond = $result_source->ident_condition('alias');
+
+Produces a condition hash to locate a row based on the primary key(s).
+
+=cut
+
 sub ident_condition {
   my ($self, $alias) = @_;
-  my %cond;
-  $cond{(defined $alias ? "${alias}.$_" : $_)} = $self->get_column($_) for $self->primary_columns;
+
+  my @pks = $self->_pri_cols;
+  my @vals = $self->_ident_values;
+
+  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;
 }