python中django框架学习模块中运行>python manage.py makemigrations报错

最新推荐文章于 2025-07-01 20:40:40 发布

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最新推荐文章于 2025-07-01 20:40:40 发布 · 2.3k 阅读

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#python #django

在Django 2.0及更高版本中，为避免数据一致性问题，外键和一对一关系需指定'on_delete'选项。报错提示缺少'required positional argument: 'on_delete''。解决方案是将外键定义更改为包含'on_delete=models.CASCADE'，例如：author = models.ForeignKey(User, related_name='blog_posts', on_delete=models.CASCADE)。on_delete有CASCADE、PROTECT、SET_NULL、SET_DEFAULT和SET()五种策略，通常使用CASCADE进行级联删除。" 52785100,5708947,手把手教你搭建Linux环境下的Redis集群,"['Redis', '集群搭建', 'Linux环境']

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源代码为：

from django.db import models
from django.utils import timezone
from django.contrib.auth.models import User

class BlogArticles(models.Model):
    title = models.CharField(max_length=300)
    author = models.ForeignKey(User, related_name="blog_posts")
    body = models.TextField()
    publish = models.DateTimeField(default=timezone.now)

    class Meta:
        ordering = ("-publish",)

    def __str__(self):
        return self.titile

E:\python项目\project1>python manage.py makemigrations

输入以上命令，报错：

Traceback (most recent call last):
  File "manage.py", line 15, in <module>
    execute_from_command_line(sys.argv)
  File "D:\python\Python36\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "D:\python\Python36\lib\site-packages\django\core\management\__init__.py", line 357, in execute