How to change the path where ruby gems are installed on OS 10.6.6 Ruby 1.8 and Rails 3

问题

Whether I use gem install or bundle install for my gems, they don't work. Sometimes sudo gem install gets gems to work. I ran the gem list -d and which gem commands, and it seems that my system is configured such that all the gems get installed into " /Library/Ruby/Gems/1.8" but my environment expects them in "/usr/bin/gem". How could I properly correct this? I was under the impression that 'bundle' should be able to install a local, application specific copy of a gem?

回答1:

I would suggest using RVM (Ruby Version Manager) to control which version of Ruby you are installing your gems into. It will also help keep all the bundle and gem data in a folder in your home directory.

回答2:

Although many Rubyists will recommend you RVM or RBENV, I do not use it. It's VERY slow and it pollutes your environment.

If you use Bundler, you dont need RVM at all - rubygem itself supports multiple versions of single gems. So you can just start using gems (e.g. gem install etc) and it will install into your $HOME/.gem directory by default. You can check the installation path using:

$ gem env
RubyGems Environment:
  - RUBYGEMS VERSION: 1.8.25
  - RUBY VERSION: 1.9.3 (2013-02-06 patchlevel 385) [x86_64-linux]
  - INSTALLATION DIRECTORY: /home/lzap/.gem/ruby/1.9.3
  - RUBY EXECUTABLE: /usr/bin/ruby
  - EXECUTABLE DIRECTORY: /home/lzap/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-linux
  - GEM PATHS:
     - /home/lzap/.gem/ruby/1.9.3
     - /usr/share/gems
     - /usr/local/share/gems
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
     - "install" => "--no-rdoc --no-ri"
  - REMOTE SOURCES:
     - http://rubygems.org/

You can even change this with GEM_HOME environment variable. Happy gemming!

来源：https://stackoverflow.com/questions/4911246/how-to-change-the-path-where-ruby-gems-are-installed-on-os-10-6-6-ruby-1-8-and-r