Flask-Cache 报错：KeyError: 'cache'

Question

下面的代码：

from flask import Flask
from flask_cache import Cache

app = Flask(__name__)

cache = Cache(config={'CACHE_TYPE': 'simple'})


@app.route('/test_cache')
@cache.cached(timeout=5)
def hello_world():
    print('if cache，the second request do not print')
    return 'Hello, World!'

运行：flask run，然后请求：curl http://127.0.0.1:5000/test_cache，有报错：

Exception possibly due to cache backend.
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/flask_cache/__init__.py", line 289, in decorated_function
    rv = self.cache.get(cache_key)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/flask_cache/__init__.py", line 192, in cache
    return app.extensions['cache'][self]
KeyError: 'cache'

请问，是什么原因？

Answer 1

上面这种写法，需要加上这段代码：cache.init_app(app)
详见代码仓库：https://github.com/cag2050/fl...

Answer 2

from flask import Flask
from flask.ext.cache import Cache

app = Flask(__name__)
# Check Configuring Flask-Cache section for more details
cache = Cache(app,config={'CACHE_TYPE': 'simple'})