我的Gemfile似乎加载了两次。当我运行bundle install时，我看到......
的Gemfile：
source 'http://rubygems.org'
gem 'haml' # asset engine
gem 'jquery-rails'
gem 'rails', '= 3.1.1'
gem 'readable_exceptions'
gem 'sass-rails', "= 3.1.4" # asset engine
gem 'uglifier' # asset engine
gem 'bundler', ">= 1.0.18" # 1.0.18 is required for proper asset pipeline support
gem "rake", "=0.8.7"
gem "resque"
gem 'date_validator'
gem "typhoeus"
gem 'newrelic_rpm'
gem "scout_rails"
puts "Loading Gemfile"
输出：
Loading Gemfile
Loading Gemfile
Using rake (0.8.7)
Using multi_json (1.3.6)
Using activesupport (3.1.1)
我认为这会导致我的开发环境出现问题，其中所有内容都被加载了两次。当我使用独立乘客运行我的服务器时，我有奇怪的日志，例如：
development.log：
/app/models/facebook_application.rb:47: warning: already initialized constant APP_PROPERTIES
/app/models/facebook_application.rb:59: warning: already initialized constant ADJUSTABLE_MIGRATIONS
/app/models/facebook_application.rb:210: warning: already initialized constant MAX_TRIES
什么样的系统问题可能导致一切都被加载两次？
我：
答案 0 :(得分：2)
也许我错过了一些东西，但看起来后面有一条线 宝石'scout-rails' 这说 把'加载Gemfile'
所以也许不是你加载你的Gemfile两次（实际上这不会是一个问题，因为我们可以整天捆绑安装而不会破坏任何东西），但它看起来像是因为你放了一个这句话说的。
答案 1 :(得分：0)
这就是Bundler的工作方式。它执行一些检查以满足现有的依赖关系。 Bundler在自己的DSL中运行Gemfile以获取依赖关系树。
在Ruby级别禁止双重要求：第一个require加载文件，下一个调用返回false，表示此文件已经在聚会上，无需再次加载。所以我怀疑Bundler会导致你的错误。
顺便说一句，您不必将bundle exec与rails命令一起使用。 Rails核心团队成员解释了here为什么。
顺便说一下＃2：install是默认的bundle行为。
答案 2 :(得分：0)
我遇到了同样的问题，这是由于Dsl#eval_gemfile从以下位置被两次调用导致的：
@bundler_version >= Gem::Version.new("1.14")时为true）这并不意味着您的gem会被加载两次（如前所述，它是由Ruby的require实现实现的）。但是，当您尝试一次从gemfile打印信息量时，这很烦人。
如果您的问题与一次打印一些信息有关，那么一种解决方法可能是（缺乏更好的解决方案）：
if $YOUR_ONCE_CHECK.nil?
puts "Doing it only once"
$YOUR_ONCE_CHECK = true
end
我将在下面放置相应的堆栈跟踪以获取详细信息：
gems/bundler-1.17.0/lib/bundler/dsl.rb:47:in `instance_eval'
gems/bundler-1.17.0/lib/bundler/dsl.rb:47:in `eval_gemfile'
gems/bundler-1.17.0/lib/bundler/plugin.rb:60:in `gemfile_install'
gems/bundler-1.17.0/lib/bundler/cli/install.rb:60:in `run'
gems/bundler-1.17.0/lib/bundler/cli.rb:235:in `block in install'
gems/bundler-1.17.0/lib/bundler/settings.rb:143:in `temporary'
gems/bundler-1.17.0/lib/bundler/cli.rb:234:in `install'
gems/bundler-1.17.0/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
gems/bundler-1.17.0/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
gems/bundler-1.17.0/lib/bundler/vendor/thor/lib/thor.rb:387:in `dispatch'
gems/bundler-1.17.0/lib/bundler/cli.rb:27:in `dispatch'
gems/bundler-1.17.0/lib/bundler/vendor/thor/lib/thor/base.rb:466:in `start'
gems/bundler-1.17.0/lib/bundler/cli.rb:18:in `start'
gems/bundler-1.17.0/exe/bundle:30:in `block in <top (required)>'
gems/bundler-1.17.0/lib/bundler/friendly_errors.rb:124:in `with_friendly_errors'
gems/bundler-1.17.0/exe/bundle:22:in `<top (required)>'
bin/bundle:23:in `load'
bin/bundle:23:in `<main>'
另一个电话：
gems/bundler-1.17.0/lib/bundler/dsl.rb:47:in `instance_eval'
gems/bundler-1.17.0/lib/bundler/dsl.rb:47:in `eval_gemfile'
gems/bundler-1.17.0/lib/bundler/dsl.rb:12:in `evaluate'
gems/bundler-1.17.0/lib/bundler/definition.rb:34:in `build'
gems/bundler-1.17.0/lib/bundler.rb:135:in `definition'
gems/bundler-1.17.0/lib/bundler/cli/install.rb:62:in `run'
gems/bundler-1.17.0/lib/bundler/cli.rb:235:in `block in install'
gems/bundler-1.17.0/lib/bundler/settings.rb:143:in `temporary'
gems/bundler-1.17.0/lib/bundler/cli.rb:234:in `install'
gems/bundler-1.17.0/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
gems/bundler-1.17.0/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
gems/bundler-1.17.0/lib/bundler/vendor/thor/lib/thor.rb:387:in `dispatch'
gems/bundler-1.17.0/lib/bundler/cli.rb:27:in `dispatch'
gems/bundler-1.17.0/lib/bundler/vendor/thor/lib/thor/base.rb:466:in `start'
gems/bundler-1.17.0/lib/bundler/cli.rb:18:in `start'
gems/bundler-1.17.0/exe/bundle:30:in `block in <top (required)>'
gems/bundler-1.17.0/lib/bundler/friendly_errors.rb:124:in `with_friendly_errors'
gems/bundler-1.17.0/exe/bundle:22:in `<top (required)>'
bin/bundle:23:in `load'
bin/bundle:23:in `<main>'