正在运行的应用程序处理 ViewDogs 的获取请求时,返回的错误是 500 内部服务器错误。在 GAE Stack Driver 控制台我得到:
NeedIndexError: no matching index found - recommended index is:
- kind:Dog
ancestor: yes
properties: -
name: id
direction: desc".
我确认加载了一个名为 Dog 的索引,它当前显示“正在服务”
还要确认成功创建了 4 只狗,它们可以从 DataStore Entities 选项卡中单独查询,也可以使用 SELECT * FROM Dog 进行查询。另请注意注释掉的行在self.response.write('You dog!')
未注释时按预期返回,因此可能不是路线问题。我可以通过 GET 返回一条狗(省略此代码) ViewAllDogs 类中的代码可能有问题,我已尽力使用 GAE 文档。
index.yaml 文件,我确认已上传并且状态为:“serving”
indexes:
- kind: Dog
ancestor: yes
properties:- name: id
direction: desc
- name: name
direction: desc
- name: type
direction: desc
- name: weight
direction: desc
- name: boarded
direction: desc
app.yaml 文件:
runtime: python27
api_version: 1
threadsafe: true
handlers:
- url: /.*
script: main.app
主文件
import webapp2
from datetime import datetime
from google.appengine.ext import ndb
import webbrowser
import json
def gql_json_parser(query_obj):
result = []
for entry in query_obj:
result.append(dict([(p, unicode(getattr(entry, p))) for p in entry.properties()]))
return result
class Dog(ndb.Model):
""" Models an individual Dog """
id = ndb.StringProperty(required = True, indexed = True)
name = ndb.StringProperty(required = True, indexed = True)
type = ndb.StringProperty(required = True, indexed = True)
weight = ndb.IntegerProperty(required = True, indexed = True)
boarded = ndb.BooleanProperty(required = True, indexed = True)
@classmethod
def query_dog(cls, ancestor_key):
return cls.query(ancestor=ancestor_key).order(-cls.id)
class ViewAllDogs(webapp2.RequestHandler):
def get(self):
# self.response.write('You dog!')
parent_dog = self.request.get('parent_dog')
ancestor_key = ndb.Key("Dog", parent_dog or '*noDogs*')
query_data = Dog.query_dog(ancestor_key).fetch(10)
json_query_data = gql_json_parser(query_data)
self.response.headers['Content-Type'] = 'application/json'
self.response.write(json.dumps(json_query_data))
app = webapp2.WSGIApplication([
('/ViewDogs', ViewAllDogs)
], debug=True)
类似的问题比比皆是,包括所有实体的 Query google app engine 数据存储,但没有一个能解决我的问题。谢谢。