我正在使用python flask框架。我编写了一个需要一个参数的装饰器，该参数是动态的。

我的装饰器如下所示，将获得一个密钥，并使用该密钥从redis获取数据。

def redis_hash_shop_style(key):
    def fn_wrapper(f):
        @wraps(f)
        def decorated_function(*args, **kwargs):
            data = redis_hash(key)
            return data
        return decorated_function
return fn_wrapper

而且我有一个使用这种装饰器的类，像这样的代码

class ShopAreaAndStyleListAPI(Resource):
    @redis_hash_shop_style(key='shop_{}_style'.format(g.city.id))
    def get(self):
        # if not found from redis, query from mysql
        pass

如您所见，我的装饰器需要一个名为的参数key，然后像这样传递密钥

@redis_hash_shop_style(key='shop_{}_style'.format(g.city.id)) g.city.id
将获得城市的ID，如果一切正常，密钥将如下所示

shop_100_style

但我得到了错误：

class ShopAreaAndStyleListAPI(Resource):
File "xx.py", line 659, in ShopAreaAndStyleListAPI

@redis_hash_shop_style(key='shop_{}_style'.format(g.city.id))

File "/Users/xx/.virtualenvs/yy/lib/python2.7/site-packages/werkzeug/local.py", line 347, in __getattr__
return getattr(self._get_current_object(), name)
File "/Users/xx/.virtualenvs/yy/lib/python2.7/site-packages/werkzeug/local.py", line 306, in _get_current_object
return self.__local()
File "/Users/xx/.virtualenvs/yy/lib/python2.7/site-packages/flask/globals.py", line 44, in _lookup_app_object
raise RuntimeError(_app_ctx_err_msg)
RuntimeError: Working outside of application context.

This typically means that you attempted to use functionality that 
needed to interface with the current application object in a way.  
To solve this set up an application context with app.app_context().  
See the documentation for more information.

我很困惑，在烧瓶中，如何将动态参数传递给装饰器？

谢谢。