flask sqlalchemy 更新错误 - update() 缺少 1 个必需的位置参数:'self'
flask sqlalchemy update error - update() missing 1 required positional argument: 'self'
我正在用 flask-restful 构建一个 restful-api。下面的代码是[PUT]users/api,通过json接受名为email的变量,通过reqparse解析,这是flask-restful.[=14给出的方法=]
class UserAPI(Resource):
def __init__(self):
self.reqparse = reqparse.RequestParser()
self.reqparse.add_argument('email', type=str,
help='No Email Provided', location='json')
super(UserAPI, self).__init__()
def put(self,id):
args = self.reqparse.parse_args()
user = User.update(email=args.email) #this is the code causing error
return {id:user.email}
api.add_resource(UserAPI, '/api/users/<int:id>', endpoint='user')
方法 "update" 是一个自定义函数,如下所示:
def update(self, commit=True, **kwargs):
"""Update specific fields of a record."""
for attr, value in kwargs.iteritems():
setattr(self, attr, value)
return commit and self.save() or self
但是,当我将 {"email":"admin@amdin.com"} 的 [put] 命令发送到 localhost/api/users/ 时,它给出了以下错误:
Traceback (most recent call last):
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask\app.py", line 1836, in __call__
return self.wsgi_app(environ, start_response)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask\app.py", line 1820, in wsgi_app
response = self.make_response(self.handle_exception(e))
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask_restful\__init__.py", line 265, in error_router
return original_handler(e)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask\app.py", line 1403, in handle_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask\_compat.py", line 32, in reraise
raise value.with_traceback(tb)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask\app.py", line 1817, in wsgi_app
response = self.full_dispatch_request()
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask\app.py", line 1477, in full_dispatch_request
rv = self.handle_user_exception(e)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask_restful\__init__.py", line 265, in error_router
return original_handler(e)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask\app.py", line 1381, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask\_compat.py", line 32, in reraise
raise value.with_traceback(tb)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask\app.py", line 1475, in full_dispatch_request
rv = self.dispatch_request()
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask_debugtoolbar\__init__.py", line 124, in dispatch_request
return view_func(**req.view_args)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask_restful\__init__.py", line 446, in wrapper
resp = resource(*args, **kwargs)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask_httpauth.py", line 61, in decorated
return f(*args, **kwargs)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask\views.py", line 84, in view
return self.dispatch_request(*args, **kwargs)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask_restful\__init__.py", line 550, in dispatch_request
resp = meth(*args, **kwargs)
File "C:\Users\NI\projects\nektime\nektime\public\views.py", line 76, in put
user = User.update(email=args.email)
TypeError: update() missing 1 required positional argument: 'self'
您正在对用户 class 而不是用户实例调用更新。您可以在调用更新之前实例化用户:
user = User.query.get(id)
user.update(email=args.email)
或者您可以将 update 设为 @class 方法,并将 cls 作为第一个参数而不是 self,这将实例化一个 User。
我正在用 flask-restful 构建一个 restful-api。下面的代码是[PUT]users/api,通过json接受名为email的变量,通过reqparse解析,这是flask-restful.[=14给出的方法=]
class UserAPI(Resource):
def __init__(self):
self.reqparse = reqparse.RequestParser()
self.reqparse.add_argument('email', type=str,
help='No Email Provided', location='json')
super(UserAPI, self).__init__()
def put(self,id):
args = self.reqparse.parse_args()
user = User.update(email=args.email) #this is the code causing error
return {id:user.email}
api.add_resource(UserAPI, '/api/users/<int:id>', endpoint='user')
方法 "update" 是一个自定义函数,如下所示:
def update(self, commit=True, **kwargs):
"""Update specific fields of a record."""
for attr, value in kwargs.iteritems():
setattr(self, attr, value)
return commit and self.save() or self
但是,当我将 {"email":"admin@amdin.com"} 的 [put] 命令发送到 localhost/api/users/ 时,它给出了以下错误:
Traceback (most recent call last):
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask\app.py", line 1836, in __call__
return self.wsgi_app(environ, start_response)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask\app.py", line 1820, in wsgi_app
response = self.make_response(self.handle_exception(e))
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask_restful\__init__.py", line 265, in error_router
return original_handler(e)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask\app.py", line 1403, in handle_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask\_compat.py", line 32, in reraise
raise value.with_traceback(tb)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask\app.py", line 1817, in wsgi_app
response = self.full_dispatch_request()
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask\app.py", line 1477, in full_dispatch_request
rv = self.handle_user_exception(e)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask_restful\__init__.py", line 265, in error_router
return original_handler(e)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask\app.py", line 1381, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask\_compat.py", line 32, in reraise
raise value.with_traceback(tb)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask\app.py", line 1475, in full_dispatch_request
rv = self.dispatch_request()
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask_debugtoolbar\__init__.py", line 124, in dispatch_request
return view_func(**req.view_args)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask_restful\__init__.py", line 446, in wrapper
resp = resource(*args, **kwargs)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask_httpauth.py", line 61, in decorated
return f(*args, **kwargs)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask\views.py", line 84, in view
return self.dispatch_request(*args, **kwargs)
File "C:\Users\NI\Envs\nektime\lib\site-packages\flask_restful\__init__.py", line 550, in dispatch_request
resp = meth(*args, **kwargs)
File "C:\Users\NI\projects\nektime\nektime\public\views.py", line 76, in put
user = User.update(email=args.email)
TypeError: update() missing 1 required positional argument: 'self'
您正在对用户 class 而不是用户实例调用更新。您可以在调用更新之前实例化用户:
user = User.query.get(id)
user.update(email=args.email)
或者您可以将 update 设为 @class 方法,并将 cls 作为第一个参数而不是 self,这将实例化一个 User。