相关疑难解决方法(0)

我通过散布模型,蓝图来重新分解我的Flask应用程序,但我遇到了运行时错误.

def create_app():
    app = flask.Flask("app")
    app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite://'
    app.register_blueprint(api)
    db.init_app(app)
    db.create_all()
    return app

我有以下问题(示例项目在这里托管:https://github.com/chfw/sample):

Traceback (most recent call last):
  File "application.py", line 17, in <module>
    app = create_app()
  File "application.py", line 12, in create_app
    db.create_all()
  File "\AppData\Roaming\Python\Python27\site-packages\flask_sqlalchemy\__init__.py", line 856, in create_all
    self._execute_for_all_tables(app, bind, 'create_all')
  File "\AppData\Roaming\Python\Python27\site-packages\flask_sqlalchemy\__init__.py", line 836, in _execute_for_all_tables
    app = self.get_app(app)
  File "\AppData\Roaming\Python\Python27\site-packages\flask_sqlalchemy\__init__.py", line 809, in get_app
    raise RuntimeError('application not registered on db 
           'RuntimeError: application not registered on db 
            instance and no application …

我有一个像这样的应用工厂

db = SQLAlchemy()

def create_app(environment):
  app = Flask(__name__)
  app.config.from_object(config[environment])

  db.init_app(app)
  # ... etc

  return app

然后,我有一个脚本,它在应用程序的上下文之外提取CSV.这个脚本是一个每x小时运行一次的cron

我想以某种方式更新sqlite数据库应用程序正在使用.这可能吗？