Question

我正在使用Python中的Google App Engine开发API。我在向特定网址发送GET请求时遇到问题。我得到了'NoneType＆＃39;对象没有属性to_dict错误。麻烦来自apiClient.py中的out = client.to_dict()，它通过

路由到main.py.

app.router.add(webapp2.Route(r'/api/client/<clientid:[0-9]+><:/?>', 'apiClient.Client'))

我不明白为什么ndb.Key(db_defs.Client, int(kwargs['clientid'])).get()返回无

apiClient.py：

import webapp2 
from google.appengine.ext import ndb
import db_defs
import json

class Client(webapp2.RequestHandler):
    #returns all or a specified client(s)
    def get(self, **kwargs):
        if 'application/json' not in self.request.accept:
            self.response.status = 406
            self.response.status_message = "Not acceptable: json required"
            return
        if 'clientid' in kwargs:
            client = ndb.Key(db_defs.Client, int(kwargs['clientid'])).get()
            out = client.to_dict()
            self.response.write(json.dumps(out))
        else:
            q = db_defs.Client.query()
            keys = q.fetch(keys_only=True)
            results = { 'keys' : [x.id() for x in keys]}
            self.response.write(json.dumps(results))

db_defs.py：

from google.appengine.ext import ndb

#http://stackoverflow.com/questions/10077300/one-to-many-example-in-ndb

class Model(ndb.Model):
    def to_dict(self):
        d = super(Model, self).to_dict()
        d['key'] = self.key.id()
        return d

class Pet(Model):
    name = ndb.StringProperty(required=True)
    type = ndb.StringProperty(choices=set(["cat", "dog"]))
    breed = ndb.StringProperty(required=False)
    weight = ndb.IntegerProperty(required=False)
    spayed_or_neutered = ndb.BooleanProperty()
    photo = ndb.BlobProperty()
    owner = ndb.KeyProperty(kind='Client')


class Client(Model):
    lname = ndb.StringProperty(required=True)
    fname = ndb.StringProperty(required=False)
    phone = ndb.StringProperty(required=False)
    email = ndb.StringProperty(required=False)
    staddr = ndb.StringProperty(required=False)
    pets = ndb.KeyProperty(kind='Pet', repeated=True, required=False)

    def to_dict(self):
        d = super(Client, self).to_dict()
        d['pets'] = [p.id() for m in d['pets']]
        return d

编辑：

当我向http://localhost:8080/api/client/发出GET请求时，我会收到客户ID列表：

{＆＃34; keys＆＃34;：[4679521487814656,4855443348258816,5136918324969472， 5242471441235968,5277655813324800,5559130790035456， 5699868278390784,5805421394657280,6051711999279104， 6368371348078592,6544293208522752,6614661952700416， 6685030696878080]}

我已验证的

与GAE数据存储查看器中的相同。

但是当我向http://localhost:8080/api/client/4679521487814656发出GET请求时我得到了NoneType错误。

Answer 1

Reveal.configure()设置为client，这不是具有None方法的对象。

to_dict()为client，因为以下表达式返回None：

None

e.g。该密钥没有client = ndb.Key(db_defs.Client, int(kwargs['clientid'])).get()个对象。

＆＃39; AttributeError：＆＃39; NoneType＆＃39;对象没有属性＆＃39; to_dict＆＃39;

1 个答案: