如何在相同（用户）table 的消息 table 中添加两个外键作为外键？

Question

我正在尝试在后端使用 Django rest 设计一个聊天应用程序

我的模型

class MessageModel(models.Model):
    message = models.CharField(max_length=200)
    msg_from = models.ForeignKey(UserModel,on_delete=models.CASCADE)
    msg_to = models.ForeignKey(UserModel,on_delete=models.CASCADE)

但出现以下错误

SystemCheckError: System check identified some issues:

ERRORS:
message_api.MessageModel.msg_from: (fields.E304) Reverse accessor for 'message_api.MessageModel.msg_from' clashes with reverse accessor for 'message_api.MessageModel.msg_to'.
        HINT: Add or change a related_name argument to the definition for 'message_api.MessageModel.msg_from' or 'message_api.MessageModel.msg_to'.
message_api.MessageModel.msg_to: (fields.E304) Reverse accessor for 'message_api.MessageModel.msg_to' clashes with reverse accessor for 'message_api.MessageModel.msg_from'.
        HINT: Add or change a related_name argument to the definition for 'message_api.MessageModel.msg_to' or 'message_api.MessageModel.msg_from'.

如何设计用于聊天的数据库table？我正在使用 MySQL 数据库。

Answer 1

class MessageModel(models.Model):
    message = models.CharField(max_length=200)
    msg_from = models.ForeignKey(UserModel,on_delete=models.CASCADE, related_name="msg_sender")
    msg_to = models.ForeignKey(UserModel,on_delete=models.CASCADE,related_name="msg_reciever")

Good advice from Willem also don't use the Model suffix, instead name your models "Message" and "User"

如何在相同（用户）table 的消息 table 中添加两个外键作为外键？

How to add two foreign keys in message table of same(user) table as foreign keys?

mysql

django

django-models

django-rest-framework