Rails: devise install on rails_admin

■ devise user add

$ rails g devise:install

$ vim ../config/environments/development.rb

   config.action_mailer.default_url_options = { host: 'hhoshina.info', port: 3000 }  ← add

   end

$ rails g devise user
$ rake db:migrate

■new user add ( on rails_admin website )

■  add admin column to user

  $ rails g migration AddAdminToUser user

  $ vim 20150209134227_add_admin_to_user.rb

   -----

  1 class AddAdminToUser < ActiveRecord::Migration

  2   def change

  3     add_column :users, :admin, :boolean      <--- Change                                  

  4   end

  5 end

  -----

■ admin flag add ( on rails_admin website)

■ cancan config
 $ rails g cancan:ability
 $ vim model/ability.rb
  --------
  1 class Ability                                                                
  2     include CanCan::Ability
  3
  4     def initialize(user)
  5         if user && user.admin?
  6             can :access, :rails_admin
  7             can :manage, :all
  8         end
  9     end
 10 end

 --------

■rails_admin config

 $ vim initializers/rails_admin.rb

 12 ## == Devise ==

 13    config.authenticate_with do |controller|

 14     warden.authenticate! scope: :user

 15    end

 16    config.current_user_method(&:current_user)

 17 

 18   ## == Cancan ==

 19    config.authorize_with :cancan