lib/sitehub/collection.rb in sitehub-0.5.0.alpha3 vs lib/sitehub/collection.rb in sitehub-0.5.0.alpha4

@@ -14,10 +14,10 @@
         if name == :add && !overrides.include?(name)
           overrides << name
           alias_method :add_backup, :add
 
           send(:define_method, :add) do |id, value, *args|
-            raise DuplicateVersionException, UNIQUE_LABELS_MSG if self[id]
+            raise DuplicateVersionException, UNIQUE_LABELS_MSG if key?(id)
             add_backup id, value, *args
           end
         end
       end
     end