Fixed #23560 -- Fixed MigrationWrite to handle builtin types without imports.

Thanks Tim Graham for the review.

1 files changed, 4 insertions, 1 deletions

diff --git a/django/db/migrations/writer.py b/django/db/migrations/writer.py
index 05fcfba202..5bb7d81e34 100644
--- a/django/db/migrations/writer.py
+++ b/django/db/migrations/writer.py
@@ -352,7 +352,10 @@ class MigrationWriter(object):
                     return string, set(imports)
             if hasattr(value, "__module__"):
                 module = value.__module__
-                return "%s.%s" % (module, value.__name__), set(["import %s" % module])
+                if module == six.moves.builtins.__name__:
+                    return value.__name__, set()
+                else:
+                    return "%s.%s" % (module, value.__name__), set(["import %s" % module])
         # Other iterables
         elif isinstance(value, collections.Iterable):
             imports = set()