Use Flask's Click CLI with the app factory pattern

Question

I define my Flask application using the app factory pattern. When using Flask-Script, I can pass the factory function to the Manager. I\'d like to use Flask\'s

Answer 1

In order to pass arguments to your app factory, you need to make use of script_info like so...

manage.py

#!/usr/bin/env python

import click
import config

from flask import Flask
from flask.cli import FlaskGroup, pass_script_info


def create_app(script_info):
    app = Flask(__name__)

    if script_info.config_mode:
        obj = getattr(config, script_info.config_mode)
        flask_config.from_object(obj)

    ...    
    return app


@click.group(cls=FlaskGroup, create_app=create_app)
@click.option('-m', '--config-mode', default="Development")
@pass_script_info
def manager(script_info, config_mode):
    script_info.config_mode = config_mode


if __name__ == "__main__":
    manager()

config.py

class Config(object):
    TESTING = False

class Production(Config):
    DATABASE_URI = 'mysql://user@localhost/foo'

class Development(Config):
    DATABASE_URI = 'sqlite:///app.db'

class Testing(Config):
    TESTING = True
    DATABASE_URI = 'sqlite:///:memory:'

now in the command line you can do manage -m Production run (after either adding the entry_points to setup.py as @davidism mentioned, or running pip install manage.py).