技術標籤：railsGemfile

某次在執行bundler install時，提示警告資訊：

[DEPRECATED] Your Gemfile contains multiple primary sources. Using `source` more than once without a block is a security risk, and may result in installing unexpected gems. To resolve this warning, use a block to indicate which gems should come from the secondary source. To upgrade this warning to an error, run `bundle config set --local disable_multisource true`.

看原因應該是有兩個source源，搜尋了一下專案，果然有兩個源，一個在根目錄/Gemfile，一個在plugin/redmine_messager/Gemfile，這兩個Gemfile在執行bundler時會合併到同一個Gemfile.lock中。

解決方法：

修改plugin/redmine_messager/Gemfile

source 'https://gems.ruby-china.com/'

gem 'slim-rails'
gem 'validate_url'

為

source 'https://gems.ruby-china.com/' do
  gem 'slim-rails'
  gem 'validate_url'
end
 

再次執行bundler，沒有報錯了

參考：https://stackoverflow.com/a/35314040/13497698