What are Rails migrations and how do I use them?

What are Rails migrations and how do I use them?

Rails migrations are a way to manage your database schema changes in Ruby on Rails. They allow you to create, modify, and delete database tables and columns in a structured way.

Can you give me an example of creating a migration?

Sure! To create a migration, you can run the command rails generate migration CreateUsers name:string email:string. This will create a migration file to create a 'users' table with 'name' and 'email' columns.

How do I run the migration after creating it?

You can run the migration by executing the command rails db:migrate. This will apply all pending migrations to your database.

What if I want to roll back a migration?

You can roll back the last migration by running rails db:rollback. If you want to roll back multiple steps, you can specify the number of steps with rails db:rollback STEP=n.