README.md

This demonstrates that you can configure a Flask application through Flask-Script, without having to create a Flask instance or deal with circular dependencies. Note that Flask-Script's Manager accepts a factory function in place of a Flask app object.

Running:

python manage.py runserver

gives "Hello, world!" on http://localhost:5000/, while running:

python manage.py -c development.cfg runserver

gives "Hello, developer!".

app.py

import os

from flask import Flask


def create_app(config=None):
    app = Flask(__name__)
    if config is None:
        config = os.path.join(app.root_path, 'production.cfg')

    app.config.from_pyfile(config)

    @app.route('/')
    def index():
        return 'Hello, %(name)s!' % {'name': app.config['HELLO']}

    return app

development.cfg

HELLO = 'developer'

manage.py

from flask.ext.script import Manager

from app import create_app

manager = Manager(create_app)
manager.add_option('-c', '--config', dest='config', required=False)


if __name__ == '__main__':
    manager.run()

production.cfg

HELLO = 'world'

I copied this into my project but can not seem to actually pass a value into create_app.

I tried printing the value of whats passed to -c and it returns None

Has this changed?

I don't get it. How can I access app inside my functions?

well, after manager.run() is called the manager.app will be replaced with flask app instance returned by create_app. So you can access app with manager.app