Ruby: Rails migrations

This documentation is part of the Learning Ruby guide. View the full guide here: A comprehensive Ruby and Rails guide.

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Migrations allow you to evolve your database schema in a consistent and verifiable way. They use a Ruby DSL, so you do not have to write raw SQL by hand, making your schema changes database-independent. Here is how you can create and run a migration:

1. Create a new migration:

   rails generate migration MigrationName
   

2. In the generated migration file (db/migrate/):

   class MigrationName < ActiveRecord::Migration[6.0]
     def change
       add_column :table_name, :column_name, :type
       remove_column :table_name, :column_name
     end
   end