tastype获取全部资源只在第二次有效

Question

我正在开发一个后台使用Tastypie和Django开发的Android应用程序。我有一个get请求，我希望能够选择性地检索整个对象(包含完整的相关字段，而不是uri)。下面是我正在谈论的资源的部分python代码:

class RideResource(ModelResource):
    user = fields.ForeignKey(UserResource, 'driver')
    origin = fields.ForeignKey(NodeResource, 'origin', full=True)
    destination = fields.ForeignKey(NodeResource, 'destination', full=True)
    path = fields.ForeignKey(PathResource, 'path')
    # if the request has full_path=1 then we perform a deep query, returning the entire path object, not just the URI
    def dehydrate(self, bundle):
        if bundle.request.GET.get('full_path') == "1":
            self.path.full = True
        else:
            ride_path = bundle.obj.path
            try:
                bundle.data['path'] = _Helpers.serialise_path(ride_path)
            except ObjectDoesNotExist:
                bundle.data['path'] = []
        return bundle

可以看到，riderresource有一个指向PathResource的外键。我使用脱水函数来检查GET请求是否将参数"full_path"设置为1。在这种情况下，我通过编程将路径变量设置为full=True。否则，我只返回路径URI。

问题是代码似乎只有在第二次执行GET时才能工作。我已经测试了数百次，当我使用full_path=1执行GET时，即使它输入if并设置self.path.full = True，第一次它也只返回PathResource对象的URI。然而，如果我重新启动完全相同的请求第二次它工作完美…

你知道是什么问题吗?

在找到解决方案后编辑感谢@Tomasz Jakub Rup

我终于设法让它工作使用以下代码:

def full_dehydrate(self, bundle, for_list=False):
    self.path.full = bundle.request.GET.get('full_path') == "1"
    return super(RideResource, self).full_dehydrate(bundle, for_list)
def dehydrate(self, bundle):
    if not bundle.request.GET.get('full_path') == "1":
        try:
            bundle.data['path'] = _Helpers.serialise_path(bundle.obj.path)
        except ObjectDoesNotExist:
            bundle.data['path'] = []
    return bundle

Answer 1

dehydrate在full_dehydrate之后调用。覆盖full_dehydrate功能

def full_dehydrate(self, bundle, for_list=False):
    self.path.full = bundle.request.GET.get('full_path') == "1"
    return super(RideResource, self).full_dehydrate(bundle, for_list)