diff --git a/tailbone/views/master.py b/tailbone/views/master.py
index d01bb462..c53dac60 100644
--- a/tailbone/views/master.py
+++ b/tailbone/views/master.py
@@ -2094,7 +2094,8 @@ class MasterView(View):
         if self.merge_handler:
             return self.merge_handler.get_merge_preview_data(obj)
 
-        raise NotImplementedError("please implement `{}.get_merge_data()`".format(self.__class__.__name__))
+        return dict([(f, getattr(obj, f))
+                     for f in self.get_merge_fields()])
 
     def get_merge_resulting_data(self, remove, keep):
         result = dict(keep)