按内容为models的字段筛选模型.ForeignKey（User）

I have a

我有一个

class Posts(models.Model):
    created_by = models.ForeignKey(User)
    post = models.CharField(max_length=150)
    active = models.NullBooleanField()
    def __unicode__(self):
        return self.post
class Posts(models.Model):