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我正在尝试访问管理面板中的 Django-filer 字段，但我没有获取图像，我知道 filer 设置的存储位置是随机的，但obj.bg_image_one.image.url似乎不起作用

我的模特

class CustomFilters(models.Model):
    input_file = models.ImageField(
        upload_to='input/images/', blank=True, null=True)
    name = models.CharField(max_length=50)
    action = models.CharField(max_length=150, choices=ACTION_CHOICES)
    is_active = models.BooleanField(default=False)

    bg_image_one = FilerFileField(null = True,on_delete = models.CASCADE)
    bg_image_two = FilerFileField(null = True,on_delete = models.CASCADE,related_name="bg_image_two")
    bg_image_three = FilerFileField(null = True,on_delete = models.CASCADE,related_name="bg_image_three")
    bg_image_four = FilerFileField(null = True,on_delete = models.CASCADE,related_name="bg_image_four")
    bg_image_five = FilerFileField(null = True,on_delete = models.CASCADE,related_name="bg_image_five")

管理员代码

class CustomFiltersAdmin(admin.ModelAdmin):
    list_display = ('name', 'is_active', 'action',
                    'Input_Image', 'Output_Image','bg_image_one')

    list_filter = ('name', 'is_active', 'action')

    search_fields = ('name', 'action', 'created_by')
    ordering = ('name',)

    autocomplete_fields = ('user',)
    readonly_fields = ['Input_Image', 'background_image_1',
                       'background_image_2', 'background_image_3', 'background_image_4', 'background_image_5', 'Output_Image']



def background_image_1(self, obj):
        return mark_safe('<img src="{url}" width="{width}" height="auto" />'.format(
            url=obj.bg_image_one.image.url,
            width=obj.bg_image_one.image.width,
            height=obj.bg_image_one.image.height,
        )
        )
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