django/django — pull request #2253 by rkstapenhurst (2014-02-09 14:36:33+00:00)
Title: Fixed #21763: Descriptive error msg for missing methods on ManyRelatedMa...

...nager

Attempting to add() and remove() an object related by a 'through' model
now raises more descriptive AttributeErrors, in line with set and
create().