blog.Post：(models.E014)“排序”必须是元组或列表（即使您只想按一个字段排序）。在 Django 中

Question

我正在为我的 Django 博客应用程序制作模型。但在运行时python manage.py makemigrations blog，我收到此错误消息：

SystemCheckError: System check identified some issues:

ERRORS:
blog.Post: (models.E014) 'ordering' must be a tuple or list (even if you want to order by only one field).

这是我的models.py文件：

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

class Post(models.Model):
    STATUS_CHOICES = (
        ('draft','Draft'),
        ('published','Published')
    )
    title = models.CharField(max_length=250)
    slug = models.SlugField(max_length=250,unique_for_date='publish')
    author = models.ForeignKey(User,on_delete=models.CASCADE,related_name='blog_posts')
    body = models.TextField()
    publish = models.DateTimeField(default=timezone.now)
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)
    status = models.CharField(max_length=10,choices=STATUS_CHOICES,default='draft')

    class Meta:
        ordering = ('-publish')

    def __str__(self):
        return self.title

该错误表明我的排序应该是列表或元组。但它已经是了。我无法理解这个错误。有人可以帮我吗？提前致谢

Answer 1

尝试这个：

ordering = ('-publish',)