python - Django ORM 为最近的朋友友谊生成错误的查询

Question

这是我的模型

class PingUser(AbstractUser):
    friends = models.ManyToManyField("self", through="Friendship", symmetrical=False)

class Friendship(TimestampedModel, SerializeMixin):
    STATUS_CHOICES = (
        ("pending", "Pending"),
        ("friend", "Friend"),
        ("favorite", "Favorite")
    )
    user = models.ForeignKey(PingUser, related_name="friendships")
    friend = models.ForeignKey(PingUser, related_name="friendships_reverse")
    status = models.CharField(max_length=20, default=STATUS_CHOICES[0][0], choices=STATUS_CHOICES)

    class Meta:
            unique_together = [('user', 'friend')]

编码

id = 4
friendships = Friendship.objects.exclude(status="pending").filter(
            ~Q(user__friendships__status="pending"), user__friendships__friend_id=id).order_by("-created_at")

执行查询

SELECT `sample_app_friendship`.`id`,
       `sample_app_friendship`.`created_at`,
       `sample_app_friendship`.`updated_at`,
       `sample_app_friendship`.`user_id`,
       `sample_app_friendship`.`friend_id`,
       `sample_app_friendship`.`status`
FROM `sample_app_friendship`
INNER JOIN `sample_app_pinguser` ON (`sample_app_friendship`.`user_id` = `sample_app_pinguser`.`id`)
INNER JOIN `sample_app_friendship` T5 ON (`sample_app_pinguser`.`id` = T5.`user_id`)
WHERE (NOT (`sample_app_friendship`.`status` = 'pending')
       AND NOT ((`sample_app_friendship`.`user_id` IN
                   (SELECT U2.`user_id`
                    FROM `sample_app_friendship` U2
                    WHERE (U2.`status` = 'pending'
                           AND U2.`user_id` IS NOT NULL))
                 AND `sample_app_pinguser`.`id` IS NOT NULL))
       AND T5.`friend_id` = 4)

所需的查询实际上是

SELECT `sample_app_friendship`.`id`,
       `sample_app_friendship`.`created_at`,
       `sample_app_friendship`.`updated_at`,
       `sample_app_friendship`.`user_id`,
       `sample_app_friendship`.`friend_id`,
       `sample_app_friendship`.`status`
FROM `sample_app_friendship`
INNER JOIN `sample_app_pinguser` ON (`sample_app_friendship`.`user_id` = `sample_app_pinguser`.`id`)
INNER JOIN `sample_app_friendship` T5 ON (`sample_app_pinguser`.`id` = T5.`user_id`)
WHERE (NOT (`sample_app_friendship`.`status` = 'pending')
       AND (NOT T5.`status` = 'pending')
       AND T5.`friend_id` = 4)

更有经验的人可以解释一下吗？谢谢！