Question

使用CLI中的命令迁移我在Django中创建的模型

python manage.py migrate

在CLI显示错误

__init__() missing 1 required positional argument: 'on_delete'

这是代码：

from django.db import models

class Topic(models.Model):

    top_name = models.CharField(max_length=264,unique=True)

    def __str__(self):
        return self.top_name

class Webpage(models.Model):

    topic = models.ForeignKey(Topic)
    name = models.CharField(max_length=264,unique=True)
    url = models.URLField(unique=True)

    def __str__(self):
        return self.name

class AccessRecord(models.Model):

    name = models.ForeignKey(Webpage)
    date = models.DateField()

    def __str__(self):
        return str(self.date)

Answer 1

因为在此行中缺少1个必需的位置参数：“ on_delete”。

topic = models.ForeignKey(Topic,on_delete=models.CASCADE)
name = models.ForeignKey(Webpage,on_delete=models.CASCADE)

Django

“多对一关系。需要两个位置参数：与模型相关的类和on_delete选项。”

For further details Django Documentation

迁移模型时如何解决迁移错误

1 个答案: