GAE NeedIndexError：

Question

返回的錯誤是500當正在運行的應用程序處理ViewDogs的獲取請求時發生內部服務器錯誤。在GAE堆棧驅動控制檯我得到：

NeedIndexError: no matching index found - recommended index is: 
- kind:Dog 
    ancestor: yes 
    properties: - 
    name: id 
    direction: desc". 

我確認有加載一個名爲狗的指數，它目前顯示「服務」

也確認有4只狗成功創建，它們可以被查詢DataStore實體選項卡單獨並使用SELECT * FROM Dog。還要注意註釋掉的行self.response.write('You dog!')，如果沒有註釋，它會按預期返回，所以大概不是路由問題。我可以通過GET返回一條狗（這段代碼被省略）類ViewAllDogs中的代碼可能有問題，在GAE文檔中盡我所能。

index.yaml中的文件，我確認上傳，並具有狀態： 「服務」

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 

main.py

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) 

類似的問題比比皆是，包括這Query google app engine datastore for all entities但沒有解決我的問題。謝謝。

Answer 1

像往常一樣，我是使得它更復雜得多，需要的話......

import webapp2, json 
from datetime import datetime 
from google.appengine.ext import ndb 

MAXDOGS = 100 

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) 

class ViewAllDogs(webapp2.RequestHandler): 
    def get(self): 
     query_data = Dog.query() 
     results = query.fetch(limit = MAX_SLIPS) 
     aList = [] 
     for match in results: 
      aList.append({'id': match.id, 'name': match.name, 'type': match.type, 
          'weight': match.weight, 'boarded': match.boarded}) 
     self.response.headers['Content-Type'] = 'application/json' 
     self.response.write(json.dumps(aList)) 

app = webapp2.WSGIApplication([ 
    ('/ViewDogs', ViewAllDogs)