GAE的Python類型錯誤的數據存儲篩選查詢

Question

我在一個RequestHandler堅持這樣的實體，並且可以通過SDK控制檯驗證：

class Moment(db.Model): 
    user = db.IntegerProperty() 
    index = db.IntegerProperty() 

編輯：我以前只包含部分類定義，並沒有表現出我是如何編寫模型的。下面是完整的例子：

class Moment(db.Model): 
    user = db.IntegerProperty() 
    index = db.IntegerProperty() 
    date = db.DateTimeProperty() 
    qx = db.FloatProperty() 
    qy = db.FloatProperty() 
    qz = db.FloatProperty() 
    qw = db.FloatProperty() 
    latitude = db.FloatProperty() 
    longitude = db.FloatProperty() 
    image = db.BlobProperty() 
    def __init__(self, obj): 
     super(Moment,self).__init__() 
     self.user = obj['user'] 
     self.index = obj['index'] 
     self.date = obj['date'] 
     self.qx = obj['qx'] 
     self.qy = obj['qy'] 
     self.qz = obj['qz'] 
     self.qw = obj['qw'] 
     self.latitude = obj['latitude'] 
     self.longitude = obj['longitude'] 
     self.image = obj['image'] 

class UploadHandler(webapp2.RequestHandler): 
    def post(self): 
     obj = biplist.readPlistFromString(self.request.body) 
     Moment(obj).put() 

當我嘗試過濾GET ...

class ServeHandler(webapp2.RequestHandler): 
    def get(self): 
     params = {} 
     params['user'] = int(self.request.get('user')) 
     params['index'] = int(self.request.get('index')) 
     q = Moment.all() 
     q.filter("user =", params['user']) 
     q.filter("index =", params['index']) 
     print q.get() 

我得到如下：

ERROR 2012-11-04 06:56:04,846 webapp2.py:1553] __init__() got an unexpected keyword argument 'index' 
Traceback (most recent call last): 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 1536, in __call__ 
    rv = self.handle_exception(request, response, e) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 1530, in __call__ 
    rv = self.router.dispatch(request, response) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 1278, in default_dispatcher 
    return route.handler_adapter(request, response) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 1102, in __call__ 
    return handler.dispatch() 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 572, in dispatch 
    return self.handle_exception(e, self.app.debug) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 570, in dispatch 
    return method(*args, **kwargs) 
    File "<path>/main.py", line 51, in get 
    print q.get() 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/db/__init__.py", line 2102, in get 
    return results.next() 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/db/__init__.py", line 2314, in next 
    return self.__model_class.from_entity(self.__iterator.next()) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/db/__init__.py", line 1442, in from_entity 
    return cls(None, _from_entity=entity, **entity_values) 
TypeError: __init__() got an unexpected keyword argument 'index' 
INFO  2012-11-04 06:56:04,849 dev_appserver.py:3092] "GET /serve?user=0&index=0 HTTP/1.1" 500 - 

但是，如果我這樣做print q.count()，而不是print q.get()我會得到1.似乎我正在根據文檔正確地做事，我嘗試了我發現的類似問題的建議，但無濟於事。

SDK v1.7.3

Answer 1

通過評論啓發留給我的問題，還有一些概念，我做錯了什麼，通過添加一些其他類似的問題/解答您的問題，我重新評估我的方式正在處理Model類。事實證明，至少我重寫類構造函數的方式，我相信我是以超類處理初始化的方式破壞了某些東西。以下工作適合我現在：

class Moment(db.Model): 
    user = db.IntegerProperty() 
    index = db.IntegerProperty() 
    date = db.DateTimeProperty() 
    qx = db.FloatProperty() 
    qy = db.FloatProperty() 
    qz = db.FloatProperty() 
    qw = db.FloatProperty() 
    latitude = db.FloatProperty() 
    longitude = db.FloatProperty() 
    image = db.BlobProperty() 

class UploadHandler(webapp2.RequestHandler): 
    def post(self): 
     obj = biplist.readPlistFromString(self.request.body) 
     Moment(user = obj['user'], 
       index = obj['index'], 
       date = obj['date'], 
       qx = obj['qx'], 
       qy = obj['qy'], 
       qz = obj['qz'], 
       qw = obj['qw'], 
       latitude = obj['latitude'], 
       longitude = obj['longitude'], 
       image = obj['image']).put()