Follow Ruby conventions of double-under's on each side of the method name

lib/factory_girl/attribute_assigner.rb

@@ -66,7 +66,7 @@ module FactoryGirl
     end
 
     def override_names
-      @evaluator.__overrides.keys
+      @evaluator.__override_names__
     end
 
     def hash_instance_methods_to_respond_to

lib/factory_girl/evaluator.rb

@@ -51,8 +51,8 @@ module FactoryGirl
       end
     end
 
-    def __overrides
+    def __override_names__
-      @overrides
+      @overrides.keys
     end
   end
 end