How can you create indexes with your own names in Ruby on Rails?

Question

Ruby on Rails

For example, I create indexes like this:

class AddIndexesToSubscriptionPeriods3 < ActiveRecord::Migration
  def change
    add_index :subscription_periods, [:period_start, :period_finish, :newspaper_id]
  end
end

And the migration does not work due to the fact that the name is long, which is automatically given.
How can you give your name?

Answer 1

add_index :subscription_periods, :period_start, name: 'name_index'