Run Alembic migrations on Google App Engine

Question

I have a Flask app that uses SQLAlchemy (Flask-SQLAlchemy) and Alembic (Flask-Migrate). The app runs on Google App Engine. I want to use Google Cloud SQL.

On my mac

Answer 1

It's all just code you can run, so you can create an admin endpoint with which to effect an upgrade:

@app.route('/admin/dbupgrade')
def dbupgrade():
    from flask_migrate import upgrade, Migrate
    migrate = Migrate(app, db)
    upgrade(directory=migrate.directory)
    return 'migrated'

(Dropwizard, for instance, caters nicely for such admin things via tasks)