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

After generating a migration rails generate migration CreateBoards name:string description:string

In the migration file, add index as shown below:

class CreateBoards < ActiveRecord::Migration
  def change
   create_table :boards do |t|
     t.string :name
     t.string :description

     t.timestamps
   end

   add_index :boards, :name, unique: true

 end
end