使用 ModelAdmin 在 Django 4.0 中显示继承的 Field

Question

我寻找解决方案，但我相信我做错了什么，或者在 Django 4 中是不同的。

created_at

和

updated_at

字段不会出现在管理中。我不知道我在跳过什么。

家长班

class TimeStampMixin(models.Model):
  class Meta:
      abstract = True
  created_at = models.DateTimeField(auto_now_add=True)
  updated_at = models.DateTimeField(auto_now=True)

  def __str__(self) -> str:
      return f'{self.created_at} - {self.updated_at}'

继承自TimeStampMixin的类

class Post(TimeStampMixin):
    STATUS_CHOICES = (
        ('draft', 'Draft'),
        ('published', 'Published'),
    )
    title = models.CharField(max_length=200)
    body = models.TextField()
    category = models.ForeignKey('Category', on_delete=models.SET_NULL, null=True)
    # tags = models.ManyToManyField('Tag')
    tags = TaggableManager()
    objects = models.Manager() # The default manager.
    slug = models.SlugField(max_length=250,
                            unique_for_date='publish')
    author = models.ForeignKey(User,
                              on_delete=models.CASCADE,
                              related_name='blog_posts')
    publish = models.DateTimeField(default=timezone.now)
    status = models.CharField(max_length=10,
                              choices=STATUS_CHOICES,
                              default='draft')
    
    published = PublishedManager() # Our custom manager.


    class Meta:
        ordering = ('-publish',)
        
    def __str__(self):
        return self.title
    
    def get_absolute_url(self):
        return reverse('blog:post_detail',
                        args=[self.publish.year,
                                self.publish.month,
                                self.publish.day, self.slug])

admin.py

文件中的管理规范

@admin.register(Post)
class PostAdmin(admin.ModelAdmin):
    list_display = ('title', 'slug', 'author', 'publish', 'status', 'created_at', 'updated_at')
    list_filter = ('status', 'created_at', 'publish', 'author')
    search_fields = ('title', 'body')
    prepopulated_fields = {'slug': ('title',)}
    raw_id_fields = ('author',)
    date_hierarchy = 'publish'
    ordering = ('status', 'publish')

结果

Answer 1

问题是你的

created_at

和

updated_at

应该是

readonly_fields

。尝试以下方法

@admin.register(Post)
class PostAdmin(admin.ModelAdmin):
    list_display = ('created_at', 'updated_at')
    # your code
    readonly_fields = ('created_at', 'updated_at')

会起作用的

Answer 2

这是您应该做的，然后应用迁移，然后再将父模型添加到

admin.py

。

class TimeStampMixin(models.Model):
      created_at = models.DateTimeField(auto_now_add=True)
      updated_at = models.DateTimeField(auto_now=True)
      
      class Meta:
            abstract = True
      def __str__(self):
          return f'{self.created_at} - {self.updated_at}'

更好的是，可以将日期时间字段添加到您的子模型中，因为您没有将父级添加到管理员中，我想它应该可以工作。所以你可以做这样的事情。这只是一个替代示例..

class Post(TimeStampMixin):
    STATUS_CHOICES = (
        ('draft', 'Draft'),
        ('published', 'Published'),
    )
    title = models.CharField(max_length=200)
    body = models.TextField()
    category = models.ForeignKey('Category', on_delete=models.SET_NULL, null=True)
    # tags = models.ManyToManyField('Tag')
    tags = TaggableManager()
    objects = models.Manager() # The default manager.
    slug = models.SlugField(max_length=250,
                            unique_for_date='publish')
    author = models.ForeignKey(User,
                              on_delete=models.CASCADE,
                              related_name='blog_posts')
    publish = models.DateTimeField(default=timezone.now)
    status = models.CharField(max_length=10,
                              choices=STATUS_CHOICES,
                              default='draft')
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    
    published = PublishedManager() # Our custom manager.