Ticket #13771: related_field_validation.patch

django/db/models/fields/related.py

@@ -828 +828 @@
         if value is None:
             return
 
-        qs = self.rel.to._default_manager.filter(**{self.rel.field_name:value})
+        db = model_instance._state.db
+        if db is None:
+            db = router.db_for_write(model_instance.__class__, instance=model_instance)            
+        qs = self.rel.to._default_manager.using(db).filter(**{self.rel.field_name:value})
         qs = qs.complex_filter(self.rel.limit_choices_to)
         if not qs.exists():
             raise exceptions.ValidationError(self.error_messages['invalid'] % {
@@ -1054 +1057 @@
         except ValueError:
             # the CommaSeparatedIntegerField validator will catch this error
             return
+        # TODO: this validation is not aware of the database to use in a multi-db configuration
         objects = mod._default_manager.in_bulk(pks)
         if len(objects) != len(pks):
             badkeys = [k for k in pks if k not in objects]