Django admin list_filter - 过滤字段为空(无或空字符串 "")

Question

在 models.py 中我有:

class User(modals.Model):
    name = models.CharField(max_length=255)
    image = models.ImageField(blank=True, null=True)

在 admin.py 中:

class UserAdmin(admin.ModelAdmin):
    list_filter = ['image']

admin.site.register(User, UserAdmin)

我只想通过是否有图像(空或空字符串)来过滤用户

但是 django 显示按图像网址过滤 =)

有没有办法让 list_filter = ['image'] 表现得像 bool 字段？

非常感谢您的建议!

Answer 1

admin.py

class ImageListFilter(admin.SimpleListFilter):

    title = _('Has photo')

    parameter_name = 'has_photo'

    def lookups(self, request, model_admin):

        return (
            ('yes', _('Yes')),
            ('no',  _('No')),
        )

    def queryset(self, request, queryset):

        if self.value() == 'yes':
            return queryset.filter(image__isnull=False).exclude(image='')

        if self.value() == 'no':
            return queryset.filter(Q(image__isnull=True) | Q(image__exact=''))


class UserAdmin(admin.ModelAdmin):

    list_filter = [ImageListFilter]