Question

我正在使用项目ap pengine-rest-server来为所有现有模型创建REST Web服务。我收到一个奇怪的错误，第一次查询浏览器：http://localhost:8080/rest/metadata/user，它给了我结果：

      <xs:schema>
      −
      <xs:element name="user">
      −
      <xs:complexType>
      −
      <xs:sequence>
      <xs:element maxOccurs="1" minOccurs="0" name="key" type="xs:normalizedString"/>
      <xs:element maxOccurs="1" minOccurs="0" name="surname" type="xs:string"/>
      <xs:element maxOccurs="1" minOccurs="0" name="firstname" type="xs:string"/>
      <xs:element maxOccurs="1" minOccurs="0" name="ages" type="xs:long"/>
      <xs:element maxOccurs="1" minOccurs="0" name="sex" type="xs:boolean"/>
      <xs:element maxOccurs="1" minOccurs="0" name="updatedDate" type="xs:dateTime"/>
      <xs:element maxOccurs="1" minOccurs="0" name="createdDate" type="xs:dateTime"/>
      </xs:sequence>
      </xs:complexType>
      </xs:element>
      </xs:schema>

但是刷新页面会给我这个错误：

  Traceback (most recent call last):
    File "/Users/foo/Documents/AppEngine/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 3185, in _HandleRequest
      self._Dispatch(dispatcher, self.rfile, outfile, env_dict)
    File "/Users/foo/Documents/AppEngine/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 3128, in _Dispatch
      base_env_dict=env_dict)
    File "/Users/foo/Documents/AppEngine/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 515, in Dispatch
      base_env_dict=base_env_dict)
    File "/Users/foo/Documents/AppEngine/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 2387, in Dispatch
      self._module_dict)
    File "/Users/foo/Documents/AppEngine/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 2297, in ExecuteCGI
      reset_modules = exec_script(handler_path, cgi_path, hook)
    File "/Users/foo/Documents/AppEngine/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 2195, in ExecuteOrImportScript
      script_module.main()
    File "/Users/foo/Documents/AppEngine/helloworld/main.py", line 48, in main
      rest.Dispatcher.add_models({"user": UserModel})
    File "/Users/foo/Documents/AppEngine/helloworld/rest/__init__.py", line 845, in add_models
      cls.add_model(model_name, model_type)
    File "/Users/foo/Documents/AppEngine/helloworld/rest/__init__.py", line 863, in add_model
      raise KeyError("name %s already used" % model_name)
  KeyError: 'name user already used'

有人可以解释为什么会这样吗？重新启动服务器，再次在浏览器上运行我得到xml结果，但刷新导致错误。它是appengine-rest-server应用程序中的错误还是在我的代码中？我的helloworld应用程序可供下载here。

Answer 1

由于您具有main()功能，App Engine会缓存您的模块并导入。因此，在同一运行时内，您可以多次调用add_models()。如果将rest初始化代码移动到模块级别（或者在模块初始化期间调用一次的函数，而不是在每次调用main()期间），它应该可以工作。

app-engine-rest-server引发KeyError（“名称％s已使用”％model_name）

1 个答案: