Gemfileに追加 gem devise コマンド bundle install rails g devise:install config/environments/development.rbに追加 config.action_mailer.default_url_options {host: 'localhost', port: 3000} app/views/layouts/application.html.erbに追加 p class="notice">%= notice %>/p> p class="alert">%= alert %>/p> rails g devise:views rails g devise user rails db:migrate ArticlesControllerに追加 before_action :authenticate_user!
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