X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FResultSetColumn.pm;h=fbedf88209cbf52b142ec0cfae48d88aeda29ea4;hb=9ffa8fd71f7e3e8c81b785f2e49353af93c13aa9;hp=f27259297dc2ac0f3507cfe763332738493b9fdd;hpb=658fa250be6ed1944d042ccf985d5c05d41111f6;p=dbsrgits%2FDBIx-Class-Historic.git

diff --git a/lib/DBIx/Class/ResultSetColumn.pm b/lib/DBIx/Class/ResultSetColumn.pm
index f272592..fbedf88 100644
--- a/lib/DBIx/Class/ResultSetColumn.pm
+++ b/lib/DBIx/Class/ResultSetColumn.pm
@@ -54,18 +54,22 @@ sub new {
   return $new;
 }
 
-=head2 as_query
+=head2 as_query (EXPERIMENTAL)
 
 =over 4
 
 =item Arguments: none
 
-=item Return Value: [ $sql, @bind ]
+=item Return Value: \[ $sql, @bind ]
 
 =back
 
 Returns the SQL query and bind vars associated with the invocant.
 
+This is generally used as the RHS for a subquery.
+
+B<NOTE>: This feature is still experimental.
+
 =cut
 
 sub as_query { return shift->_resultset->as_query }
@@ -184,6 +188,24 @@ sub min {
   return shift->func('MIN');
 }
 
+=head2 min_rs
+
+=over 4
+
+=item Arguments: none
+
+=item Return Value: $resultset
+
+=back
+
+  my $rs = $year_col->min_rs();
+
+Wrapper for ->func_rs for function MIN().
+
+=cut
+
+sub min_rs { return shift->func_rs('MIN') }
+
 =head2 max
 
 =over 4
@@ -205,6 +227,24 @@ sub max {
   return shift->func('MAX');
 }
 
+=head2 max_rs
+
+=over 4
+
+=item Arguments: none
+
+=item Return Value: $resultset
+
+=back
+
+  my $rs = $year_col->max_rs();
+
+Wrapper for ->func_rs for function MAX().
+
+=cut
+
+sub max_rs { return shift->func_rs('MAX') }
+
 =head2 sum
 
 =over 4
@@ -226,6 +266,24 @@ sub sum {
   return shift->func('SUM');
 }
 
+=head2 sum_rs
+
+=over 4
+
+=item Arguments: none
+
+=item Return Value: $resultset
+
+=back
+
+  my $rs = $year_col->sum_rs();
+
+Wrapper for ->func_rs for function SUM().
+
+=cut
+
+sub sum_rs { return shift->func_rs('SUM') }
+
 =head2 func
 
 =over 4
@@ -248,7 +306,7 @@ value. Produces the following SQL:
 
 sub func {
   my ($self,$function) = @_;
-  my $cursor = $self->{_parent_resultset}->search(undef, {select => {$function => $self->{_select}}, as => [$self->{_as}]})->cursor;
+  my $cursor = $self->func_rs($function)->cursor;
   
   if( wantarray ) {
     return map { $_->[ 0 ] } $cursor->all;
@@ -257,6 +315,30 @@ sub func {
   return ( $cursor->next )[ 0 ];
 }
 
+=head2 func_rs
+
+=over 4
+
+=item Arguments: $function
+
+=item Return Value: $resultset
+
+=back
+
+Creates the resultset that C<func()> uses to run its query.
+
+=cut
+
+sub func_rs {
+  my ($self,$function) = @_;
+  return $self->{_parent_resultset}->search(
+    undef, {
+      select => {$function => $self->{_select}},
+      as => [$self->{_as}],
+    },
+  );
+}
+
 =head2 throw_exception
 
 See L<DBIx::Class::Schema/throw_exception> for details.