Flask Factory Pattern about flask-migrate HOT 11 CLOSED

@joekendal You don't need manage.py in this case. "flask db init" and etc will do what you want. https://flask-migrate.readthedocs.io/en/latest/

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You can use init_app() with Flask-Migrate. Note that the extension requires the app and database instances as arguments, not just the app.

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I guess I should have expanded. I would like to be able to pass a config arg to the create app through the manager options. For example, if I wanted to specify a local db instead of production db.

def create_app(config):
    # load config
    return app

python app.py db migrate -config test
python app.py db migrate -config production

Maybe this is possible already, I'll take another look.

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@JustinWP I prefer to set the configuration in an environment variable, but I think you can do what you want through Flask-Script's root level options. See http://flask-script.readthedocs.org/en/latest/#adding-options-to-the-manager.

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Closing due to inactivity.

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I actually had the same question in mind : How can I specify the configuration option in comand line and still use FlaskMigrate... So I ll post the details here in case it helps make the issue clearer.

The problem comes from the fact that I need, in this order :

• app
• db
• and then

manager = Manager(app)
migrate = Migrate(app, db)
manager.add_command('db', MigrateCommand)

However adding a config option to a command will change db, and therefore when calling :
python manage.py -c dev.cfg db migrate, in my command ('db' ?) I need to :

• run my app factory method app = create_app()
• set the config from the option app.config.from_pyfile('dev.cfgs')
• initialize the db using that app db = init_db(app)
• then from my command method, I need to call the original migrate code from Flask Migrate, but on the new db object => How ? Inherit from MigrateCommand ? using it as delegate and just call a few methods ? in which order ?

While surely doable, How is at least not obvious for a new comer...

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I answered a similar question on StackOverflow: http://stackoverflow.com/a/29882346/904393. Let me know if this doesn't answer all your questions.

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Great, thats what I was missing. Thanks a lot !

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@miguelgrinberg Hi I did all of this and yet it is still not working for some reason

project/__init__.py

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate

db = SQLAlchemy()
migrate = Migrate()

def create_app():
    app = Flask(__name__)
    app.config.from_object(os.environ['APP_SETTINGS'])

    db.init_app(app)
    migrate.init_app(app, db)

    return app

manage.py

from flask_script import Manager
from flask_migrate import MigrateCommand
from project import create_app


manager = Manager(create_app)
manager.add_command('db', MigrateCommand)

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

Running the following still doesn't detect my models and then create tables:

> python manage.py db migrate
INFO  [alembic.runtime.migration] Context impl PostgresqlImpl.
INFO  [alembic.runtime.migration] Will assume transactional DDL.
>

from flask-migrate.

usage: run.py [-?] {db,shell,runserver} ...
run.py: error: invalid choice: 'migrate' (choose from 'db', 'shell', 'runserver')

me to also also same problem.

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@dayastark try run.py db migrate

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