如何在django admin字段中添加自定義html？

Question

基本上，我想要實現的是在添加或編輯界面中選擇文件後，顯示圖像縮略圖的媒體表單。我嘗試使用此代碼，但它返回此錯誤。

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

這是模型類：

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 

這是管理類

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作爲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']