我对Python很新,在我的应用程序中,我使用Neomodel从Neo4j数据库加载和检索图形数据 .
在我的一条路线中,我有以下功能:
@api_mod.route('/users')
def get_users():
users = User.nodes #Returns a NodeSet
list_of_users = list(users) #Converts the NodeSet object to a list
return json.dumps(dict(users = [user for user in list_of_users]))
我的User类定义如下:
class User(StructuredNode):
user_id = StringProperty(unique_index=True, required=True)
logged_in = RelationshipTo('Environment', 'LOGGED_IN', model=LoginAction)
launched = RelationshipTo('Application', 'LAUNCHED', model=LaunchedAction)
entered = RelationshipTo('Application', 'ENTERED', model=EnteredAction)
accessed = RelationshipTo('Application', 'ACCESSED', model=AccessedAction)
exited = RelationshipTo('Application', 'EXITED', model=ExitedAction)
logged_out = RelationshipTo('Environment', 'LOGGED_OUT', model=LogoutAction)
timed_out = RelationshipTo('Environment', 'TIME_OUT', model=TimeoutAction)
def toJSON(self):
return dict(user_id = self.user_id)
我的期望是我的/ users路由将返回一个JSON对象与数据库中的所有用户 . 我理解NodeSet对象不能序列化为JSON对象,因此我尝试将其转换为列表 . 但是现在当我运行时出现以下错误:“TypeError:'User'类型的对象不是JSON可序列化的”
以下是整个堆栈跟踪:Traceback(最近一次调用最后一次):文件"/Users/mdebarros/.virtualenvs/useractivitylogs/lib/python3.6/site-packages/flask/app.py",第1997行,在 call 返回self.wsgi_app(environ,start_response)文件"/Users/mdebarros/.virtualenvs/useractivitylogs/lib/python3.6/site-packages/flask/app.py",第1985行,在wsgi_app response = self.handle_exception(e)文件"/Users/mdebarros/.virtualenvs/useractivitylogs/lib/python3.6/site-packages/flask/app.py",第1540行,在handle_exception中重新加载(exc_type,exc_value,tb)文件"/Users/mdebarros/.virtualenvs/useractivitylogs/lib/python3.6/site-packages/flask/_compat.py",第33行,在重新提升值文件"/Users/mdebarros/.virtualenvs/useractivitylogs/lib/python3.6/site-packages/flask/app.py",第1982行,在wsgi_app response = self.full_dispatch_request()文件"/Users/mdebarros/.virtualenvs/useractivitylogs/lib/python3.6/site-packages/flask/app.py",第1614行,在full_dispatch_request中rv = self.handle_user_exception(e)文件"/Users/mdebarros/.virtualenvs/useractivitylogs/lib/python3.6/site-packages/flask/app.py",第1517行,在handle_user_exception中重新加载(exc_type,exc_value,tb)文件"/Users/mdebarros/.virtualenvs/useractivitylogs/lib/python3.6/site-packages/flask/_compat.py",第33行,在重新提升值文件"/Users/mdebarros/.virtualenvs/useractivitylogs/lib/python3.6/site-packages/flask/app.py",第1612行,在full_dispatch_request中rv = self.dispatch_request()文件"/Users/mdebarros/.virtualenvs/useractivitylogs/lib/python3.6/site-packages/flask/app.py",第1598行,在dispatch_request中返回self.view_functionsrule.endpoint文件"/Users/mdebarros/PycharmProjects/useractivitylogs/app/api/routes.py",第16行,在get_users中返回json.dumps(dict(users = [user for user in list_of_users]))文件“/usr/local/Cellar/python3/3.6 . 2 /框架/ Python.fr amework / Versions / 3.6 / lib / python3.6 / json / init .py ", line 231, in dumps return _default_encoder.encode(obj) File " /usr/local/Cellar/python3/3.6.2/Frameworks/Python.framework/Versions/3.6/lib/python3.6/json/encoder .py ", line 199, in encode chunks = self.iterencode(o, _one_shot=True) File " /usr/local/Cellar/python3/3.6.2/Frameworks/Python.framework/Versions/3.6/lib/python3.6/json/encoder.py ", line 257, in iterencode return _iterencode(o, 0) File " /usr/local/Cellar/python3/3.6.2 /Frameworks/Python.framework/Versions/3.6/lib/python3.6/json/encoder.py“,第180行,默认为o . class . name )TypeError:'User'类型的对象不是JSON可序列化的
有关如何处理此问题并返回正确的JSON对象的任何帮助或建议?
提前感谢您的任何帮助 .
--md
1 回答
如你所知,有必要的是用户类Model有一个方法来执行数据结构的转换过程(序列化),要解决,一个解决方案就是添加一个方法来做到这一点:
现在,随着方法的添加,属性可以被称为属性: