handle self-references

fkreplace/__init__.py

@@ -31,8 +31,12 @@ def merge(from_obj, to_obj):
 
     for related in from_obj._meta.get_all_related_many_to_many_objects():
         accessor_name = related.get_accessor_name()
-        if accessor_name:
         varname = related.field.name
+
+        if not accessor_name:
+            # not set in M2M to self, but varname will match
+            accessor_name = varname
+
         field = getattr(from_obj, accessor_name)
         if related.many_to_many:
             for f in field.all():

tests/tests.py

@@ -68,4 +68,4 @@ class MergeTests(TestCase):
         merge(self.a, self.b)
         assert self.a.friends.all().count() == 0
         assert self.b.friends.get().name == f.name
-        assert f.get().name == self.b.name
+        assert f.friends.get().name == self.b.name