Question

有没有办法通过在python中的云端点api实现中将它作为请求/响应消息的一部分来返回数据存储区实体？

例如：

我将实体模型定义如下

class District(ndb.Model):
    code = ndb.StringProperty(required=True)

现在我想在python中实现cloud api

 @endpoints.method(request_message=DistrictMessage, response_message=DistrictMessage, name="DistrictApi.get_by_code")
def get_by_code(self, request):
#get code from District object in request message and 
#try to get entity based on it from datastore

其中DistrictMessage定义为

class DistrictMessage(messages.Message):    
    district = messages.MessageField(District, 1, required=False)

上面不起作用，因为区域不是message.Message而是ndb.Model。我们可以在GAE Java中做类似的事情，但我无法找到它用于python。它甚至可能吗？或者我是否必须为每个实体定义一个Message类并执行/映射？

谢谢你， rizTaak

Answer 1

没有办法直接这样做。您可以查看http://endpoints-proto-datastore.appspot.com/以获取可以使用模型而非消息的补充库。

如果你想自己做，你将不得不做这样的事情。

class DistrictMessage(messages.Message):    
    code = messages.StringField(1, required=True)

class SomeApiClass():  # incomplete class def for syntax highlighting
    @endpoints.method(request_message=DistrictMessage, response_message=DistrictMessage, name="DistrictApi.get_by_code")
    def get_by_code(self, request):
        # get code from District object in request message and 
        # try to get entity based on it from datastore
        district = District.query(District.code == request.code).get()
        if district:
            # copy District properties to DistrictMessage kwargs
            # ndb.Model.to_dict() can be used here if you filter
            # out properties that aren't used in the DistrictMessage
            return DistrictMessage(code=district.code)
        raise endpoints.NotFoundException()

从Python端点返回数据存储区实体

1 个答案: