yyyymmddhhiiss_devise_create_admins.rb

class DeviseCreateAdmins < ActiveRecord::Migration
  def change
    create_table(:admins) do |t|

      # Database authenticatable
      t.string :email,              null: false, default: ""
      t.string :encrypted_password, null: false, default: ""

      # Trackable
      t.integer  :sign_in_count, default: 0, null: false
      t.datetime :current_sign_in_at
      t.datetime :last_sign_in_at
      t.string   :current_sign_in_ip
      t.string   :last_sign_in_ip

      t.timestamps null: false
    end

    add_index :admins, :email, unique: true
  end
end