ActiveRecord Migrations

Flashcard 1 of 6

In the following migration, we are adding an Action model to our todo list application. Each action will belong to a single Project. What database feature could we use to improve the performance of the t.references relationship?

class CreateActions < ActiveRecord::Migration
  def change
    create_table :actions do |t|
      t.string :title
      t.references :project

      t.timestamps null: false
    end
  end
end

Answer:

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