我正在使用 python Flask 框架。我写了一个装饰器,它需要一个参数,并且这个参数将是动态的。
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
我有一个使用这个装饰器的类,代码如下
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
,我这样传递密钥
@redis_hash_shop_style(key='shop_{}_style'.format(g.city.id))
g.city.id
将获取城市的 id,如果一切正常,密钥将是这样的
shop_100_style
但我收到错误:
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?
Thanks.