cast name to string

Author: Timothy Laurent

graphene_django/types.py

@@ -27,7 +27,7 @@ def construct_fields(options):
         is_already_created = name in options.fields
         is_excluded = name in exclude_fields or is_already_created
         # https://docs.djangoproject.com/en/1.10/ref/models/fields/#django.db.models.ForeignKey.related_query_name
-        is_no_backref = str.endswith(name, '+')
+        is_no_backref = str.endswith(str(name), '+')
         if is_not_in_only or is_excluded or is_no_backref:
             # We skip this field if we specify only_fields and is not
             # in there. Or when we exclude this field in exclude_fields.