我有一个Tastypie REST API,需要从一个视图调用Tastypie资源上的obj_create来处理Resource水合,但是我收到了一个错误 . 我不想使用客户端帖子中的任何数据,但我想手动构建请求..怎么做?

def ajax_add_comment(request):

    field_id = request.POST.get("field_id")
    comment = request.POST.get("comment")

    f = FieldResource()
    field_bundle = f.build_bundle(request=request)
    field = f.obj_get(field_bundle, id=field_id)

    fc = FieldCommentResource()
    fieldcomment_bundle = fc.build_bundle(request=request)
    res = fc.obj_create(fieldcomment_bundle, field=field, comment=comment)

当我这样做,用ajax post请求我收到错误..

UnsupportedFormat at /dashboard/ajax_add_comment The format indicated 'application/x-www-form-urlencoded' had no available deserialization method. Please check your formats and content_types on your Serializer.

再一次,我不想使用发布的数据,但想自己构建数据,那么,为什么我会得到这个错误?