What is the structure of a Ruby on Rails migration?

What is the structure of a Ruby on Rails migration?

In Ruby on Rails, a migration is a way to alter the database schema. It typically includes methods like change, up, and down.

Can you give me an example of a migration?

Sure! A simple migration to create a users table might look like this:

class CreateUsers < ActiveRecord::Migration[6.0]
  def change
    create_table :users do |t|
      t.string :name
      t.string :email
      t.timestamps
    end
  end
end

What are the best practices for writing migrations?

Best practices include keeping migrations small, using descriptive names, and avoiding complex logic within them.

How do I roll back a migration?

You can roll back a migration using the command rails db:rollback, which will undo the last migration applied.