Capistrano 部署 production 環境 從 Rails 4.2.5.1 升級到 Rails 5.2.0 的環境時遭遇了兩個問題 Cannot find gem bundler >= 0.a Solution for your production environment: reinstall rvm and bundler gem rvm implode rvm get head rvm reload rvm reset rvm use 2.4.1 rvm gemset create rails5.2.0 rvm use [email protected] --default gem install bundler which bundle modify config/deploy.rb content and