Add ::Exception, and use throw instead of die.

[dbsrgits/DBIx-Class.git] / lib / DBIx / Class / PK.pm

diff --git a/lib/DBIx/Class/PK.pm b/lib/DBIx/Class/PK.pm
index ad70690..487aa94 100644 (file)
--- a/lib/DBIx/Class/PK.pm
+++ b/lib/DBIx/Class/PK.pm
@@ -2,11 +2,30 @@ package DBIx::Class::PK;
 
 use strict;
 use warnings;
+use Tie::IxHash;
 
-use base qw/Class::Data::Inheritable DBIx::Class::SQL/;
+use base qw/Class::Data::Inheritable/;
 
 __PACKAGE__->mk_classdata('_primaries' => {});
 
+=head1 NAME 
+
+DBIx::Class::PK - Primary Key class
+
+=head1 SYNOPSIS
+
+=head1 DESCRIPTION
+
+This class represents methods handling primary keys
+and depending on them.
+
+=head1 METHODS
+
+=over 4
+
+=cut
+
+
 sub _ident_cond {
   my ($class) = @_;
   return join(" AND ", map { "$_ = ?" } keys %{$class->_primaries});
@@ -20,7 +39,8 @@ sub _ident_values {
 sub set_primary_key {
   my ($class, @cols) = @_;
   my %pri;
-  $pri{$_} = {} for @cols;
+  tie %pri, 'Tie::IxHash';
+  %pri = map { $_ => {} } @cols;
   $class->_primaries(\%pri);
 }
 
@@ -28,7 +48,8 @@ sub retrieve {
   my ($class, @vals) = @_;
   my $attrs = (@vals > 1 && ref $vals[$#vals] eq 'HASH' ? pop(@vals) : {});
   my @pk = keys %{$class->_primaries};
-  die "Can't retrieve unless primary columns are defined" unless @pk;
+  $class->throw( "Can't retrieve unless primary columns are defined" ) 
+    unless @pk;
   my $query;
   if (ref $vals[0] eq 'HASH') {
     $query = $vals[0];
@@ -39,7 +60,7 @@ sub retrieve {
   } else {
     $query = {@vals};
   }
-  die "Can't retrieve unless all primary keys are specified"
+  $class->throw( "Can't retrieve unless all primary keys are specified" )
     unless (keys %$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($query))[0];
@@ -50,14 +71,35 @@ sub retrieve {
 sub discard_changes {
   my ($self) = @_;
   delete $self->{_dirty_columns};
-  $_[0] = $self->retrieve($self->id);
+  return unless $self->in_database; # Don't reload if we aren't real!
+  my ($reload) = $self->retrieve($self->id);
+  unless ($reload) { # If we got deleted in the mean-time
+    $self->in_database(0);
+    return $self;
+  }
+  $self->store_column($_ => $reload->get_column($_))
+    foreach keys %{$self->_columns};
+  return $self;
 }
 
 sub id {
   my ($self) = @_;
-  die "Can't call id() as a class method" unless ref $self;
+  $self->throw( "Can't call id() as a class method" ) unless ref $self;
   my @pk = $self->_ident_values;
   return (wantarray ? @pk : $pk[0]);
 }
 
 1;
+
+=back
+
+=head1 AUTHORS
+
+Matt S. Trout <perl-stuff@trout.me.uk>
+
+=head1 LICENSE
+
+You may distribute this code under the same terms as Perl itself.
+
+=cut
+