如何用请求书写Flask装饰器? [英] How to write Flask decorator with request?
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问题描述
def validate_request(req_type):
如果req_type是'json'而不是request.json:
abort(400)
def decorator(func):
functools.wrap(func)$ b $ def def wrapped_func(* args,** kwargs)
返回func(* args,** kwargs)
返回wrapped_func
返回装饰器
@ app.route('/ todo / api / v1.0 / tasks /< int:task_id>'methods = ['PUT'])
@validate_request('json')
@json
def update_task(task_id):
#task = filter(lambda:t ['id'] == task_id,tasks)
task = [任务任务如果任务['id'] == task_id]
如果len(任务) == 0:
abort(404)
#update任务
用于['title','description','done']中的字段]:
task [ 0] [field] = request.json.get(field,task [0] [field])
错误: -
Traceback(最近一次调用的最后一个):
文件C:\AGR\Programming\LearningPython\FlaskLearning\flask_rest\app.py,第156行,放在< ;模块>
@validate_request('json')
文件C:\AGR\Programming\LearningPython\FlaskLearning\flask_rest\app.py,in line 144,in validate_request
如果req_type是'json'而不是request.json:
文件C:\Anconda\lib\site-packages\werkzeug\local.py,第338行,在__getattr__
返回getattr(self._get_current_object(),name)
在_get_current_object
中返回第297行的文件C:\Aaconda\lib\site-packages\werkzeug\local.py self .__ local()
文件C:\Anaconda\lib\site-packages\flask\globals.py,第20行,在_lookup_req_object
中引发RuntimeError('working outside of请求上下文)
RuntimeError:在请求上下文之外工作
这应该怎么做一个更习惯的方式???
解决方案
这就是你的装饰应该如何看起来像$ / b>
<$ (f):
@ functools.wrap(f)
def decorated_function(* args,** kws):
#您的请求
data = flask.request.get_json()
如果不是数据:
flask.abort(404)
return decorated_function
您可以这样称呼
@ app.route('/ todo / api / v1.0 / tasks /< int:task_id>',methods = ['PUT'])
@validate_request
def update_task(task_id):
#其余代码..
I am not sure why following decorator[validate_request] doesn't work. What is correct way to write such validation decorator?
def validate_request(req_type):
if req_type is 'json' and not request.json:
abort(400)
def decorator(func):
@functools.wraps(func)
def wrapped_func(*args, **kwargs):
return func(*args, **kwargs)
return wrapped_func
return decorator
@app.route('/todo/api/v1.0/tasks/<int:task_id>', methods=['PUT'])
@validate_request('json')
@json
def update_task(task_id):
# task = filter(lambda t: t['id'] == task_id, tasks)
task = [task for task in tasks if task['id'] == task_id]
if len(task) == 0:
abort(404)
#update task
for field in ['title', 'description', 'done']:
task[0][field] = request.json.get(field, task[0][field])
Error :-
Traceback (most recent call last):
File "C:\AGR\Programming\LearningPython\FlaskLearning\flask_rest\app.py", line 156, in <module>
@validate_request('json')
File "C:\AGR\Programming\LearningPython\FlaskLearning\flask_rest\app.py", line 144, in validate_request
if req_type is 'json' and not request.json:
File "C:\Anaconda\lib\site-packages\werkzeug\local.py", line 338, in __getattr__
return getattr(self._get_current_object(), name)
File "C:\Anaconda\lib\site-packages\werkzeug\local.py", line 297, in _get_current_object
return self.__local()
File "C:\Anaconda\lib\site-packages\flask\globals.py", line 20, in _lookup_req_object
raise RuntimeError('working outside of request context')
RuntimeError: working outside of request context
How should this be done in a more idiomatic way???
解决方案
This is how your decorator should look like
def validate_request(f):
@functools.wraps(f)
def decorated_function(*args, **kws):
# Do something with your request here
data = flask.request.get_json()
if not data:
flask.abort(404)
return decorated_function
and you will call it like this
@app.route('/todo/api/v1.0/tasks/<int:task_id>', methods=['PUT'])
@validate_request
def update_task(task_id):
# The rest of your code..
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