首页 > 解决方案 > Django 错误:“您正在尝试在没有默认值的情况下将不可为空的字段‘作者’添加到条目中”

问题描述

在我的models.py文件中添加作者字段后,我试图进行迁移,但Django问我这个:

You are trying to add a non-nullable field 'author' to entry without a default; we can't do that (the database needs something to populate existing rows).
Please select a fix:
 1) Provide a one-off default now (will be set on all existing rows with a null value for this column)
 2) Quit, and let me add a default in models.py

我的 Models.py 文件:

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


class Entry(models.Model):
    title = models.CharField(max_length=50, default=timezone.now)
    date = models.DateTimeField(default=timezone.now)
    content = models.TextField()
    author = models.ForeignKey(User, on_delete=models.CASCADE)

    def get_absolute_url(self):
        return reverse('diary:index')

    def __str__(self):
        return self.title

我想将当前处于活动状态的用户添加为作者,因此我在 views.py 文件中执行了此操作:

class EntryCreate(CreateView):
    model = Entry
    fields = ['title', 'content']

    def form_valid(self, form):
        form.instance.author = self.request.author
        return super().form_valid(form)

我应该怎么做才能避免这种情况?

提前致谢!

标签: pythondjangomodel

解决方案


添加default=None到您的作者


推荐阅读