Railsでdeviseひとつで複数モデルを管理しよう ref: http://qiita.com/Yama-to/items/54ab4ce08e126ef7dade

devise.rb

config.scoped_views = true

file1.txt

$ rails g devise:install

file10.txt

                   Prefix Verb   URI Pattern                       Controller#Action
                                #[--- 中略 ---]#
cancel_admin_registration GET    /admins/cancel(.:format)          admins/registrations#cancel
       admin_registration POST   /admins(.:format)                 admins/registrations#create
   new_admin_registration GET    /admins/sign_up(.:format)         admins/registrations#new
  edit_admin_registration GET    /admins/edit(.:format)            admins/registrations#edit
                          PATCH  /admins(.:format)                 admins/registrations#update
                          PUT    /admins(.:format)                 admins/registrations#update
                          DELETE /admins(.:format)                 admins/registrations#destroy
                                #[--- 中略 ---]#
 cancel_user_registration GET    /users/cancel(.:format)           users/registrations#cancel
        user_registration POST   /users(.:format)                  users/registrations#create
    new_user_registration GET    /users/sign_up(.:format)          users/registrations#new
   edit_user_registration GET    /users/edit(.:format)             users/registrations#edit
                          PATCH  /users(.:format)                  users/registrations#update
                          PUT    /users(.:format)                  users/registrations#update
                          DELETE /users(.:format)                  users/registrations#destroy
                                #[--- 中略 ---]#

file11.txt

$ rails d devise:views

#      invoke  #Devise::Generators::SharedViewsGenerator
#      remove    app/views/devise/shared/_links.html.erb
#      invoke  form_for
#      remove    app/views/devise/confirmations/new.html.erb
#      remove    app/views/devise/passwords/edit.html.erb
#      remove    app/views/devise/passwords/new.html.erb
#      remove    app/views/devise/registrations/edit.html.erb
#      remove    app/views/devise/registrations/new.html.erb
#      remove    app/views/devise/sessions/new.html.erb
#      remove    app/views/devise/unlocks/new.html.erb
#      invoke  erb
#      remove    app/views/devise/mailer/confirmation_instructions.html.erb
#      remove    app/views/devise/mailer/reset_password_instructions.html.erb
#      remove    app/views/devise/mailer/unlock_instructions.html.erb

file4.txt

$ rails g devise user
$ rails g devise admin

file5.txt

$ rails g devise:controllers users
$ rails g devise:controllers admins

file6.txt

$ rails g devise:views users
$ rails g devise:views admins

file8.txt

                   Prefix Verb   URI Pattern                       Controller#Action
                                #[--- 中略 ---]#
cancel_admin_registration GET    /admins/cancel(.:format)          devise/registrations#cancel
       admin_registration POST   /admins(.:format)                 devise/registrations#create
   new_admin_registration GET    /admins/sign_up(.:format)         devise/registrations#new
  edit_admin_registration GET    /admins/edit(.:format)            devise/registrations#edit
                          PATCH  /admins(.:format)                 devise/registrations#update
                          PUT    /admins(.:format)                 devise/registrations#update
                          DELETE /admins(.:format)                 devise/registrations#destroy
                                #[--- 中略 ---]#
 cancel_user_registration GET    /users/cancel(.:format)           devise/registrations#cancel
        user_registration POST   /users(.:format)                  devise/registrations#create
    new_user_registration GET    /users/sign_up(.:format)          devise/registrations#new
   edit_user_registration GET    /users/edit(.:format)             devise/registrations#edit
                          PATCH  /users(.:format)                  devise/registrations#update
                          PUT    /users(.:format)                  devise/registrations#update
                          DELETE /users(.:format)                  devise/registrations#destroy
                                #[--- 中略 ---]#

routes.rb

devise_for :admins, controllers: {
  sessions:      'admins/sessions',
  passwords:     'admins/passwords',
  registrations: 'admins/registrations'
}
devise_for :users, controllers: {
  sessions:      'users/sessions',
  passwords:     'users/passwords',
  registrations: 'users/registrations'
}

導入環境

Ruby:   2.1.3
Rails:  4.2.1
devise: 3.5.1