How to Create a New Table With a Unique Index in an Active Record / Rails 4 Migration

Question

How do I create a new table, through a rails migration, and add an unique index to it?

In the docs I found how to add a index to a table after it\'s been created, but h

Answer 1

A more compact way:

class CreateFoobars < ActiveRecord::Migration
  def change
    create_table :foobars do |t|
      t.string :name, index: {unique: true}
    end
  end
end