Fixed documentation of disable_constraint_checking

The docstring and base implementation of disable_constraint_checking do not indicate that a return value is expected for proper behavior.

1 files changed, 3 insertions, 2 deletions

diff --git a/django/db/backends/__init__.py b/django/db/backends/__init__.py
index 9acef4ad19..4abc08c5a1 100644
--- a/django/db/backends/__init__.py
+++ b/django/db/backends/__init__.py
@@ -390,9 +390,10 @@ class BaseDatabaseWrapper(object):
     def disable_constraint_checking(self):
         """
         Backends can implement as needed to temporarily disable foreign key
-        constraint checking.
+        constraint checking. Should return True if the constraints were 
+        disabled and will need to be reenabled.
         """
-        pass
+        return False
 
     def enable_constraint_checking(self):
         """