many_to_many.rb in mongoid-3.0.15

- old
+ new

@@ -171,10 +171,10 @@
         def substitute(replacement)
           purge
           unless replacement.blank?
             push(replacement.compact.uniq)
           else
-            reset_relation_criteria
+            reset_unloaded
           end
           self
         end
 
         # Get a criteria for the documents without the default scoping