问题描述
我正在为模块和课程学习Rails on Rails，并按照教程进行学习.当我尝试安装这样的gem时:gem simple-navigation(或gem"simple-navigation")我收到此错误
Im learning ruby on rails for a module and class and following a tutorial.When I try to install a gem like this: gem simple-navigation (or gem "simple-navigation")I get this error
所有宝石都会发生这种情况. gem install简单导航有效，但是当我运行捆绑安装时不会安装.我必须手动将其添加到gemfile才能使其正常工作.
This happens with all gems. gem install simple-navigation works, however doesnt install when i run bundle install. I have to manually add it to the gemfile to get it to work.
有人知道为什么会这样吗?使用Ruby 2.00和Rails 4
Anyone know why this is happening? Using Ruby 2.00 and Rails 4
推荐答案
这是预期的行为. gem install simple-navigation将正常工作以为 ruby 安装gem，但是要为 rails 应用程序安装gem，则需要将gem添加到Gemfile中，然后运行bundle install，而不是只运行gem install命令.
This is intended behavior. gem install simple-navigation will work correctly to install a gem for ruby, but to install a gem for your rails application, you need to add the gem to your Gemfile and then run bundle install instead of just running the gem install command.
由于运行gem simple-navigation而收到发布的错误，这不是命令.
You are getting the error you posted because you are running gem simple-navigation, and that is not a command.
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