为什么rails会迫使我使用bundle exec？

Question

我想用“回扣路线”

运行我的rake命令，但轨道生成以下错误

** Invoke routes (first_time) 
** Invoke environment (first_time) 
** Execute environment 
rake aborted! 
uninitialized constant ActiveAdmin 
/Users/aaalsubaie/Sites/Posnegs/config/initializers/active_admin.rb:1 
/Library/Ruby/Gems/1.8/gems/railties-3.2.3/lib/rails/engine.rb:588 
/Library/Ruby/Gems/1.8/gems/railties-3.2.3/lib/rails/engine.rb:587:in `each' 
/Library/Ruby/Gems/1.8/gems/railties-3.2.3/lib/rails/engine.rb:587 
/Library/Ruby/Gems/1.8/gems/railties-3.2.3/lib/rails/initializable.rb:30:in `instance_exec' 
/Library/Ruby/Gems/1.8/gems/railties-3.2.3/lib/rails/initializable.rb:30:in `run' 
/Library/Ruby/Gems/1.8/gems/railties-3.2.3/lib/rails/initializable.rb:55:in `run_initializers' 
/Library/Ruby/Gems/1.8/gems/railties-3.2.3/lib/rails/initializable.rb:54:in `each' 
/Library/Ruby/Gems/1.8/gems/railties-3.2.3/lib/rails/initializable.rb:54:in `run_initializers' 
/Library/Ruby/Gems/1.8/gems/railties-3.2.3/lib/rails/application.rb:136:in `initialize!' 
/Library/Ruby/Gems/1.8/gems/railties-3.2.3/lib/rails/railtie/configurable.rb:30:in `send' 
/Library/Ruby/Gems/1.8/gems/railties-3.2.3/lib/rails/railtie/configurable.rb:30:in `method_missing' 
/Users/aaalsubaie/Sites/Posnegs/config/environment.rb:5 
/Library/Ruby/Site/1.8/rubygems/custom_require.rb:36:in `gem_original_require' 
/Library/Ruby/Site/1.8/rubygems/custom_require.rb:36:in `require' 
/Library/Ruby/Gems/1.8/gems/railties-3.2.3/lib/rails/application.rb:103:in `require_environment!' 
/Library/Ruby/Gems/1.8/gems/railties-3.2.3/lib/rails/application.rb:292:in `initialize_tasks' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `call' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `execute' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `each' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `execute' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:158:in `invoke_with_call_chain' 
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:176:in `invoke_prerequisites' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:174:in `each' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:174:in `invoke_prerequisites' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:157:in `invoke_with_call_chain' 
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:144:in `invoke' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/application.rb:116:in `invoke_task' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `top_level' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `each' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `top_level' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/application.rb:88:in `top_level' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/application.rb:66:in `run' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/bin/rake:33 
/usr/bin/rake:23:in `load' 
/usr/bin/rake:23 
Tasks: TOP => routes => environment 

奇怪的是，当我运行“捆绑高管耙路线”
它正常工作！我面对这个错误在我的开发/生产ENV宝石上的特定版本

Answer 1

依赖创造一个应用程序发现它需要一个不同的人之前宝石的错误版本可以加载一个鸡和蛋的问题。 bundle exec有助于右脚下车。请参阅http://yehudakatz.com/2011/05/30/gem-versioning-and-bundler-doing-it-right/

Answer 2

如果您使用rvm，则可以使用bundle install --binstubs，然后您不必再执行bundle exec。详细信息请参见this post。

不要忘记bin目录添加到您的gitignore文件。