X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FPK.pm;h=e281dd48ab3c51bfd8f010e9747e3b5b69bf6baf;hb=243a6b72cfb2a6f2ccfcd84b665f1880790e2ff9;hp=4d46421eb1b93f5d4945696f8a9a9790c20a6512;hpb=cda04c3afd46989e1964a6c8a277fd7faa11b291;p=dbsrgits%2FDBIx-Class.git

diff --git a/lib/DBIx/Class/PK.pm b/lib/DBIx/Class/PK.pm
index 4d46421..e281dd4 100644
--- a/lib/DBIx/Class/PK.pm
+++ b/lib/DBIx/Class/PK.pm
@@ -2,13 +2,10 @@ package DBIx::Class::PK;
 
 use strict;
 use warnings;
-use Tie::IxHash;
 
 use base qw/DBIx::Class::Row/;
 
-__PACKAGE__->mk_classdata('_primaries' => {});
-
-=head1 NAME 
+=head1 NAME
 
 DBIx::Class::PK - Primary Key class
 
@@ -16,73 +13,16 @@ 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 ($class) = @_;
-  return join(" AND ", map { "$_ = ?" } keys %{$class->_primaries});
-}
-
 sub _ident_values {
   my ($self) = @_;
-  return (map { $self->{_column_data}{$_} } keys %{$self->_primaries});
-}
-
-=head2 set_primary_key(@cols)
-
-Defines one or more columns as primary key for this class. Should be
-called after C<columns>.
-
-=cut
-
-sub set_primary_key {
-  my ($class, @cols) = @_;
-  # check if primary key columns are valid columns
-  for (@cols) {
-    $class->throw( "Column $_ can't be used as primary key because it isn't defined in $class" )
-      unless $class->has_column($_);
-  }
-  my %pri;
-  tie %pri, 'Tie::IxHash', map { $_ => {} } @cols;
-  $class->_primaries(\%pri);
-}
-
-=head2 find(@colvalues), find(\%cols)
-
-Finds a row based on its primary key(s).
-
-=cut
-
-sub find {
-  my ($class, @vals) = @_;
-  my $attrs = (@vals > 1 && ref $vals[$#vals] eq 'HASH' ? pop(@vals) : {});
-  my @pk = keys %{$class->_primaries};
-  $class->throw( "Can't find unless primary columns are defined" ) 
-    unless @pk;
-  my $query;
-  if (ref $vals[0] eq 'HASH') {
-    $query = $vals[0];
-  } elsif (@pk == @vals) {
-    $query = {};
-    @{$query}{@pk} = @vals;
-    #my $ret = ($class->search_literal($class->_ident_cond, @vals, $attrs))[0];
-    #warn "$class: ".join(', ', %{$ret->{_column_data}});
-    #return $ret;
-  } else {
-    $query = {@vals};
-  }
-  $class->throw( "Can't find unless all primary keys are specified" )
-    unless (keys %$query >= @pk); # If we check 'em we run afoul of uc/lc
-                                  # column names etc. Not sure what to do yet
-  return $class->search($query)->next;
-  #my @cols = $class->_select_columns;
-  #my @row = $class->storage->select_single($class->_table_name, \@cols, $query);
-  #return (@row ? $class->_row_to_object(\@cols, \@row) : ());
+  return (map { $self->{_column_data}{$_} } $self->primary_columns);
 }
 
 =head2 discard_changes
@@ -90,19 +30,29 @@ sub find {
 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.
+
 =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) = $self->find($self->id);
+
+  my $reload = $self->result_source->schema->storage->reload_row($self);
+  
   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;
+
+  %$self = %$reload;
+  
+  # Avoid a possible infinite loop with
+  # sub DESTROY { $_[0]->discard_changes }
+  bless $reload, 'Do::Not::Exist';
+
   return $self;
 }
 
@@ -115,48 +65,51 @@ a class method.
 
 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;
   my @pk = $self->_ident_values;
   return (wantarray ? @pk : $pk[0]);
 }
 
-=head2 primary_columns
-
-Read-only accessor which returns the list of primary keys for a class
-(in scalar context, only returns the first primary key).
-
-=cut
-
-sub primary_columns {
-  return keys %{shift->_primaries};
-}
-
 =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>.
 
 =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 { $_ => $self->{_column_data}{$_} } keys %{$self->_primaries});
+  return $self->_create_ID(map { $_ => $self->{_column_data}{$_} }
+                             $self->primary_columns);
 }
 
 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) = @_;
+  my ($self, $alias) = @_;
   my %cond;
-  $cond{$_} = $self->get_column($_) for $self->primary_columns;
+  my $prefix = defined $alias ? $alias.'.' : '';
+  $cond{$prefix.$_} = $self->get_column($_) for $self->primary_columns;
   return \%cond;
 }