具有相同两个类的多个多对多关系 - Django

Question

我有两个类，它们之间有两个多对多关系。由于相邻的表还必须具有其他属性，因此我明确定义了它们。但我收到一条错误消息，提示我需要更改相关名称。不知道在哪里做这个。非常感谢任何帮助。

这是我的 models.py 代码：

class Client(models.Model):
    first_name = models.CharField(max_length=255)
    last_name = models.CharField(max_length=255)
    email = models.CharField(max_length=255)
    password = models.CharField(max_length=255)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    objects = UserManager()

    def __repr__(self):
        return "<User object: {} {} {} {}>".format(self.first_name, 
self.last_name, self.email, self.password)

class Therapist(models.Model):
    name = models.CharField(max_length=255)
    reviews = models.ManyToManyField(Client, through="Review")
    appts = models.ManyToManyField(Client, through="Appointment")
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    objects = UserManager()

    def __repr__(self):
        return "<Book object: {}>".format(self.title)



class Review(models.Model):
    reviewer = models.ForeignKey(Client, on_delete=models.CASCADE)
    therapist_reviewed = models.ForeignKey(Therapist, 
on_delete=models.CASCADE)
    rating = models.IntegerField()
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    content = models.TextField()

    def __repr__(self):
        return "<Review object: {} {}>".format(self.book_reviewed, 
self.reviewer)

class Appointment(models.Model):
    booked_therapist = models.ForeignKey(Therapist, 
on_delete=models.CASCADE)
    booked_client = models.ForeignKey(Client, on_delete=models.CASCADE)
    date = models.DateTimeField()
    massage = models.CharField(max_length=255)

Answer 1

class Therapist(models.Model):
    name = models.CharField(max_length=255)
    reviews = models.ManyToManyField(Client, related_name='therapist_reviews', through="Review")
    appts = models.ManyToManyField(Client, related_name='therapist_appts', through="Appointment")
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    objects = UserManager()

    def __repr__(self):
        return "<Book object: {}>".format(self.title)

如果你不为many_to_many字段分配related_name，默认的related会设置为model_lower_case_set，但是当你有两个many_to_many字段与同一个模型相关时，这两个字段的默认related_name与model_lower_case_set相同,这会在使用related_name查询queryset时产生冲突。