id,summary,reporter,owner,description,type,status,component,version,severity,resolution,keywords,cc,stage,has_patch,needs_docs,needs_tests,needs_better_patch,easy,ui_ux 7252,Non-default managers inherited from an abstract model don't function.,floguy,nobody,"Given these models: {{{ class NaiveHierarchyManager(models.Manager): def get_roots(self): return self.get_query_set().filter(parent__isnull=True) class NaiveHierarchy(models.Model): parent = models.ForeignKey('self', null=True) tree = NaiveHierarchyManager() class Meta: abstract = True class BlogPost(NaiveHierarchy): title = models.CharField(max_length = 128) body = models.TextField() objects = models.Manager() def __unicode__(self): return self.title }}} What happens is that the 'tree' manager gets assigned correctly to !BlogPost, but the manager's 'model' attribute still points to !NaiveHierarchy, which is not the correct model. Upon trying to use the manager through !BlogPost, it gives an !AttributeError, complaining that the attribute {{{_join_cache}}} doesn't exist on !NaiveHierarchy (which it shouldn't). I've attached a patch which fixes the problem in all cases, and I can't think of a reason why it wouldn't work, but it seems like the problem is better solved elsewhere. However, all attempts on my part to fix the problem elsewhere I ran into snags. (!Manager's .model isn't set by the time {{{ModelBase.__new__}}} gets called, etc).",,closed,Uncategorized,dev,,duplicate,,,Unreviewed,1,0,0,0,0,0