How do I perform data migration in Rails?

How do I perform data migration in Rails?

In Rails, you can perform data migration using the rails generate migration command to create a migration file.

What are the steps to create a migration file?

First, run rails generate migration MigrationName, then edit the generated file to define the changes you want.

Can you give me an example of a migration file?

Sure! Here's a simple example:

class AddAgeToUsers < ActiveRecord::Migration[6.0]
  def change
    add_column :users, :age, :integer
  end
end

How do I run the migration after creating the file?

You can run the migration by executing rails db:migrate in your terminal.