flask 中xx.init_app(app)方法

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bootstrap = Bootstrap() mail = Mail() moment = Moment() db = SQLAlchemy() def create_app(config_name): app = Flask(__name__) #將指定的配置通過from_object()方法匯入app.config字典設定物件 app.config.from_object(config[config_name]) config[config_name].init_app(app) bootstrap.init_app(app) mail.init_app(app) moment.init_app(app) db.init_app(app) 

 

http://flask.pocoo.org/docs/0.12/patterns/appfactories/ 
flask 文檔關於原廠模式裡面提到了上面的這種套路。 

It ’ s preferable to create your extensions and app factories so that the extension object does not initially get bound to the application. 

Using Flask-SQLAlchemy, as an example, you should not do something along those lines: 

def create_app(config_filename): 
app = Flask(__name__) 
app.config.from_pyfile(config_filename) 

db = SQLAlchemy(app) 

But, rather, in model.py (or equivalent): 

db = SQLAlchemy() 

and in your application.py (or equivalent): 

def create_app(config_filename): 
app = Flask(__name__) 
app.config.from_pyfile(config_filename) 

from yourapplication.model import db 
db.init_app(app)

flask 中xx.init_app(app)方法