lib/mongoid/report/queries_builder.rb in mongoid-report-0.1.3 vs lib/mongoid/report/queries_builder.rb in mongoid-report-0.1.5

@@ -11,16 +11,10 @@
       end
 
       private
 
       def groups
-        @group_by ||= begin
-          if settings[:group_by].size == 0
-            [:_id]
-          else
-            settings[:group_by]
-          end
-        end
+        @group_by ||= settings.fetch(:group_by, [])
       end
 
       def fields
         @fields ||= settings[:fields]
       end