当我在capistrano部署production时，我收到以下错误消息。但在staging我没有得到警告信息。
DEPRECATION WARNING: The configuration option `config.serve_static_assets` has been renamed to `config.serve_static_files` to clarify its role (it merely enables serving everything in the `public` folder and is unrelated to the asset pipeline). The `serve_static_assets` alias will be removed in Rails 5.0. Please migrate your configuration files accordingly. (called from block in tsort_each at /home/deploy/.rbenv/versions/2.2.0/lib/ruby/2.2.0/tsort.rb:226)
此外，我的production.rb和staging.rb环境文件都注释了以下行： #config.serve_static_files = true
答案 0 :(得分：0)
最终我意识到很久以前我添加了一个宝石，让应用程序在Heroku上运行。
离开heroku后，该宝石仍留在Gemfile中并导致错误。 我通过删除修复了以下内容：
gem 'rails_12factor'