如何在django admin字段中添加自定义html？

Question

基本上，我想要实现的是在添加或编辑界面中选择文件后，显示图像缩略图的媒体表单。我尝试使用此代码，但它返回此错误。

Unknown field(s) (admin_image) specified for ImageMedia. 
Check fields/fieldsets/exclude attributes of class ImageMediaAdmin. 

这是模型类：

class ImageMedia(models.Model): 
    caption = models.CharField(max_length=64) 
    picture = models.ImageField(upload_to='image_media', blank=True) 

    def admin_image(self): 
     return '<img src="%s" height="300px"/>' % self.picture 
    admin_image.allow_tags = True 

    def __str__(self): 
     return self.caption 

这是管理类

class ImageMediaAdmin(admin.ModelAdmin): 
    list_display = ('caption', 'picture', 'admin_image') 
    search_fields = ('caption', 'picture') 
    fields = ('caption', 'picture', 'admin_image') 

admin.site.register(ImageMedia, ImageMediaAdmin) 

Answer 1

您需要更改ImageMediaAdmin指定admin_image作为readonly_field。

class ImageMediaAdmin(admin.ModelAdmin): 
    list_display = ('caption', 'picture', 'admin_image') 
    search_fields = ('caption', 'picture') 
    fields = ('caption', 'picture', 'admin_image') 
    readonly_fields = ['admin_image']