django 发生Reverse query name for **** clashes with field name *****

class user(models.Model):
    user_id = models.CharField(primary_key=True,max_length=9)
    shopping_car = models.ManyToManyField(to=book,default=None,through="shopping_car")


class shopping_car(models.Model):
    belong_user = models.ForeignKey(to="user",db_column="belong_user",on_delete=models.CASCADE,default=None)

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