new conception of grouping and aggregation functionality

1 files changed, 6 insertions, 4 deletions

diff --git a/lib/active_relation/primitives/attribute.rb b/lib/active_relation/primitives/attribute.rb
index d37271490a..5b1ef4d7c0 100644
--- a/lib/active_relation/primitives/attribute.rb
+++ b/lib/active_relation/primitives/attribute.rb
@@ -10,6 +10,10 @@ module ActiveRelation
     def alias_or_name
       @alias || name
     end
+    
+    def aggregation?
+      false
+    end
 
     module Transformations
       def as(aliaz = nil)
@@ -56,10 +60,8 @@ module ActiveRelation
       end
       
       def %(other)
-        if other
-          (history - other.history) + (other.history - history)
-        else
-          history
+        if other then (history - other.history) + (other.history - history)
+        else history
         end
       end
     end