Gemfile

group :development do
  gem 'better_errors'
  gem 'binding_of_caller'
  gem 'pry-rails' # consoleを使いやすく
  gem 'pry-byebug' # `binding.pry`でデバックをpryに
  gem 'rails-erd' # `bundle exec erd`でer図を生成する
end

gem 'annotate'