X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FResultSource.pm;h=32fb84e77af78fa14e2be5c54b73cee0d673dcde;hb=c079518f7bbe43998aae31cead6127b3b85be92e;hp=ee96129275ef31c1c9378921f5de74b99494775e;hpb=de890f6b52f7a7e9d34b81d1b0c5edffc4b2863b;p=dbsrgits%2FDBIx-Class-Historic.git

diff --git a/lib/DBIx/Class/ResultSource.pm b/lib/DBIx/Class/ResultSource.pm
index ee96129..32fb84e 100644
--- a/lib/DBIx/Class/ResultSource.pm
+++ b/lib/DBIx/Class/ResultSource.pm
@@ -283,15 +283,16 @@ sub primary_columns {
 =head2 add_unique_constraint
 
 Declare a unique constraint on this source. Call once for each unique
-constraint. Unique constraints are used when you call C<find> on a
-L<DBIx::Class::ResultSet>. Only columns in the constraint are searched,
-for example:
+constraint.
 
   # For UNIQUE (column1, column2)
   __PACKAGE__->add_unique_constraint(
     constraint_name => [ qw/column1 column2/ ],
   );
 
+Unique constraints are used, for example, when you call
+L<DBIx::Class::ResultSet/find>. Only columns in the constraint are searched.
+
 =cut
 
 sub add_unique_constraint {
@@ -317,6 +318,38 @@ sub unique_constraints {
   return %{shift->_unique_constraints||{}};
 }
 
+=head2 unique_constraint_names
+
+Returns the list of unique constraint names defined on this source.
+
+=cut
+
+sub unique_constraint_names {
+  my ($self) = @_;
+
+  my %unique_constraints = $self->unique_constraints;
+
+  return keys %unique_constraints;
+}
+
+=head2 unique_constraint_columns
+
+Returns the list of columns that make up the specified unique constraint.
+
+=cut
+
+sub unique_constraint_columns {
+  my ($self, $constraint_name) = @_;
+
+  my %unique_constraints = $self->unique_constraints;
+
+  $self->throw_exception(
+    "Unknown unique constraint $constraint_name on '" . $self->name . "'"
+  ) unless exists $unique_constraints{$constraint_name};
+
+  return @{ $unique_constraints{$constraint_name} };
+}
+
 =head2 from
 
 Returns an expression of the source to be supplied to storage to specify