对django后台admin下拉框进行过滤的实例

from django.contrib import adminfrom .models import Comment# actions添加模型动作def disable_commentstatus(modeladmin, request, queryset):  queryset.update(is_enable=False)def enable_commentstatus(modeladmin, request, queryset):  queryset.update(is_enable=True)disable_commentstatus.short_description = '隐藏评论'enable_commentstatus.short_description = '显示评论'class CommentAdmin(admin.ModelAdmin):  list_display = ('id', 'commentator', 'article', 'parent_comment', 'is_enable', 'created_time')  list_display_links = ('id', 'commentator')  list_filter = ('commentator', 'article', 'is_enable')  actions = [disable_commentstatus, enable_commentstatus]  def formfield_for_foreignkey(self, db_field, request, *args, **kwargs):    if db_field.name == 'parent_comment':      try:        obj_id = request.resolver_match.args[0] #这里获取当前对象id，非常重要        kwargs['queryset'] = Comment.objects.filter(parent_comment=None).exclude(id=int(obj_id)) # 添加过滤条件      except:        kwargs['queryset'] = Comment.objects.filter(parent_comment=None)    return super(CommentAdmin, self).formfield_for_foreignkey(db_field, request, **kwargs)admin.site.register(Comment, CommentAdmin)