django - Admin filter for groups not worked -


i have created filter admin page, display users in group , not. using django 1.8 there no problem class. after upgrading django, error :

attributeerror @ /admin/main/profile/ can't set attribute

the code :

class profileadminlistfilter(admin.relatedfieldlistfilter):

def __init__(self, *a, **kw):      super(profileadminlistfilter, self).__init__(*a, **kw)    def has_output(self):      return true    @property  def include_empty_choice(self):      return true    @property  def empty_value_display(self):      return "no group"   def choices(self, cl):      c in super(profileadminlistfilter, self).choices(cl):          yield c        if self.include_empty_choice:          yield {              'selected': bool(self.lookup_val_isnull),              'query_string': cl.get_query_string({                  self.lookup_kwarg_isnull: 'true',              }, [self.lookup_kwarg]),              'display': self.empty_value_display,          }   class profileadmin(admin.modeladmin):  list_filter = (('user__groups', profileadminlistfilter),)


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