Removed obsolete references to add_to_query().

Support for it was removed in d3f00bd5706b35961390d3814dd7e322ead3a9a3.

1 files changed, 3 insertions, 3 deletions

diff --git a/django/db/models/query.py b/django/db/models/query.py
index 36ebec1905..1b3c2629d6 100644
--- a/django/db/models/query.py
+++ b/django/db/models/query.py
@@ -796,13 +796,13 @@ class QuerySet:
         """
         Return a new QuerySet instance with filter_obj added to the filters.
 
-        filter_obj can be a Q object (or anything with an add_to_query()
-        method) or a dictionary of keyword lookup arguments.
+        filter_obj can be a Q object or a dictionary of keyword lookup
+        arguments.
 
         This exists to support framework features such as 'limit_choices_to',
         and usually it will be more natural to use other methods.
         """
-        if isinstance(filter_obj, Q) or hasattr(filter_obj, 'add_to_query'):
+        if isinstance(filter_obj, Q):
             clone = self._clone()
             clone.query.add_q(filter_obj)
             return clone