What are Flask migrations and how do I use them?

What are Flask migrations and how do I use them?

Flask migrations are a way to manage changes to your database schema over time. They allow you to create, modify, and delete database tables and fields in a structured way.

How do I set up Flask migrations in my project?

You can set up Flask migrations using Flask-Migrate, which is an extension that handles SQLAlchemy database migrations for Flask applications. First, install it using pip: pip install Flask-Migrate. Then, initialize it in your app.

What commands do I need to run for creating a migration?

After setting up Flask-Migrate, you can create a migration by running flask db migrate -m "Your message here" and then apply it with flask db upgrade.

Can I roll back a migration if something goes wrong?

Yes, you can roll back a migration using the command flask db downgrade. You can specify the version you want to downgrade to.