RailsでDeviseによるユーザー登録・ログイン認証・認可の機能追加$ bundle exec rails generate devise:install create config/initializers/devise.rb create config/locales/devise.en.yml =============================================================================== Some setup you must do manually if you haven't yet: 1. Ensure you have defined default url options in your environments files. Here is an example of default_url_options appropriate for a development envi
how to customize devise error messages with classes
