删除与中介模式

Question

我已经创建了下面的M2M表中介模型M2M入门 -

class Position(models.Model): 
    position = models.CharField(max_length=100) 

class UserProfile(models.Model): 
    user = models.ForeignKey(User, unique=True) 
    positions = models.ManyToManyField(Position, through ='Timestamp', blank=True, null=True) 

class Timestamp(models.Model): 
    created_at = models.DateTimeField(auto_now_add=True) 
    position = models.ForeignKey(Position) 
    userprofile = models.ForeignKey(UserProfile) 

我创建了以下条目至今 -

>>> entry1 = Timestamp(userprofile=userprofile, position=position1) 
>>> entry2 = Timestamp(userprofile=userprofile, position=position2) 

现在我必须在userprofile_timestamp表

-- profile & position1 
-- profile & position2 

两个项目我将如何删除profile & position1入口？在文档（https://docs.djangoproject.com/en/dev/topics/db/models/#extra-fields-on-many-to-many-relationships）中，它提到使用profile.positions.clear()清除所有条目，但我将如何删除单个条目？谢谢。

Answer 1

>>> profile.positions.through.objects.get(position=position1).delete()