fix for prefetch bug in _merge_attr

diff --git a/lib/DBIx/Class/ResultSet.pm b/lib/DBIx/Class/ResultSet.pm
index f72dc66..d8db38b 100644 (file)
--- a/lib/DBIx/Class/ResultSet.pm
+++ b/lib/DBIx/Class/ResultSet.pm
@@ -193,7 +193,7 @@ sub search_rs {
 
        $our_attrs->{join} = $self->_merge_attr($our_attrs->{join}, $attrs->{_live_join_h}, 1) if ($attrs->{_live_join_h});
 
-  if (exists $our_attrs->{prefetch}) {
+  if (defined $our_attrs->{prefetch}) {
       $our_attrs->{join} = $self->_merge_attr($our_attrs->{join}, $our_attrs->{prefetch}, 1);
   }