How can I migrate flask-sqlalchemy multiple databases?

Question

I know multiple databases work on flask-sqlalchemy with __bind_key__. But I don't know how to migrate those databases on alembic(flask-migrate). Here's env.py:

from flask import current_app
config.set_main_option('sqlalchemy.url', current_app.config.get('SQLALCHEMY_BINDS')['bind_main'])

target_metadata = {
    'bind_main': current_app.extensions['migrate'].db.metadata,
    'bind_follower': current_app.extensions['migrate'].db.metadata,
}

How can I set follower db on target_metadata? flask-migrate doesn't care about bind databases. Thanks.

Answer 1

To create a multiple database migration repository, add the --multidb argument to the init command:

$ python app.py db init --multidb

For more details please refer to flask-migrate documentation