django经理的问题

Question

我有以下型号:

class UserProfile(models.Model):
    """
    User profile model, cintains a Foreign Key, which links it to the
    user profile.
    """
    about = models.TextField(blank=True)
    user = models.ForeignKey(User, unique=True)
    ranking = models.IntegerField(default = 1)
    avatar = models.ImageField(upload_to="usermedia", default = 'images/js.jpg')
    updated = models.DateTimeField(auto_now=True, default=datetime.now())
    is_bot = models.BooleanField(default = False)
    is_active = models.BooleanField(default = True)
    is_free = models.BooleanField(default = True)
    objects = ProfileManager()

    def __unicode__(self):
        return u"%s profile" %self.user

还有经理

class ProfileManager(models.Manager):
    """
    Stores some additional helpers, which to get some profile data
    """
    def get_active_members(self):
        '''
        Get all people who are active
        '''
        return self.filter(is_active = True)

什么时候,我尝试调用UserProfile.obgets.get_active_members()之类的东西

我得到了

raise AttributeError, "Manager isn't accessible via %s instances" % type.__name__

AttributeError:无法通过UserProfile实例访问Manager

能否请你帮忙

Answer 1

管理器仅适用于模型类,不适用于模型实例.

这将有效:

UserProfile.objects

这不会:

profile = UserProfile.objects.get(pk=1)
profile.objects

换句话说,如果您是在调用它实例的UserProfile,它会提高你看例外.您可以确认一下如何访问经理吗？

来自文档:

管理员只能通过模型​​类而不是模型实例访问,以强制实现"表级"操作和"记录级"操作之间的分离