ruby-on-rails - 安装 ruby​​ gems 后，运行新的 gem 返回 "Could not find"错误

Question

全新的 Ubuntu 10.04 安装:

我在让我的 gem 安装过程正常运行时遇到了一些问题。每当我安装 gem 时，它都会通过一个漂亮、直接的过程，没有任何问题:

$ gem install rails
Successfully installed rails-3.2.2
1 gem installed

然后验证版本，也许是一个简单的“rails -v”？不:

$ rails -v
/home/pragone/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems/dependency.rb:247:in `to_specs': Could not find railties (>= 0) amongst [bigdecimal-1.1.0, io-console-0.3, json-1.5.4, minitest-2.5.1, rake-0.9.2.2, rdoc-3.9.4] (Gem::LoadError)
from /home/pragone/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems/dependency.rb:256:in `to_spec'
from /home/pragone/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems.rb:1210:in `gem'
from /home/pragone/.rvm/gems/ruby-1.9.3-p125/bin/rails:18:in `<main>'

所以让我们确保安装了 railties:

$ gem install railties
Successfully installed railties-3.2.2
1 gem installed

然后再次尝试获取rails的版本:

$ rails -v
/home/pragone/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems/dependency.rb:247:in `to_specs': Could not find railties (>= 0) amongst [bigdecimal-1.1.0, io-console-0.3, json-1.5.4, minitest-2.5.1, rake-0.9.2.2, rdoc-3.9.4] (Gem::LoadError)
from /home/pragone/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems/dependency.rb:256:in `to_spec'
from /home/pragone/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems.rb:1210:in `gem'
from /home/pragone/.rvm/gems/ruby-1.9.3-p125/bin/rails:18:in `<main>'

几乎我安装的每个 gem 都会出现这种情况。我尝试搜索有关如何使用 gem 安装东西的某种文档，但找不到任何东西。似乎有些 gem 安装在一个位置，有些安装在另一个位置，其中一个位置不在我的路径中。知道这里发生了什么吗？

编辑:要求的信息:

RubyGems Environment:
  - RUBYGEMS VERSION: 1.8.17
  - RUBY VERSION: 1.9.3 (2012-02-16 patchlevel 125) [x86_64-linux]
  - INSTALLATION DIRECTORY: /home/pragone/.rvm/gems/ruby-1.9.3-p125
  - RUBY EXECUTABLE: /home/pragone/.rvm/rubies/ruby-1.9.3-p125/bin/ruby
  - EXECUTABLE DIRECTORY: /home/pragone/.rvm/gems/ruby-1.9.3-p125/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-linux
  - GEM PATHS:
     - /home/pragone/.rvm/gems/ruby-1.9.3-p125
     - /home/pragone/.rvm/gems/ruby-1.9.3-p125@global
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
     - "gem" => "--no-ri --no-rdoc"
  - REMOTE SOURCES:
     - http://rubygems.org/

和 rvm 信息:

system:

  system:
    uname:       "Linux domU-12-31-39-0A-34-6E 2.6.32-311-ec2 #23-Ubuntu SMP Thu Dec 2 11:14:35 UTC 2010 x86_64 GNU/Linux"
    bash:        "/bin/bash => GNU bash, version 4.1.5(1)-release (x86_64-pc-linux-gnu)"
    zsh:         " => not installed"

  rvm:
    version:      "rvm 1.10.3 by Wayne E. Seguin <wayneeseguin@gmail.com>, Michal Papis <mpapis@gmail.com> [https://rvm.beginrescueend.com/]"
    updated:      "2 hours 40 minutes 7 seconds ago"

  homes:
    gem:          "not set"
    ruby:         "not set"

  binaries:
    ruby:         "/usr/bin/ruby"
    irb:          "/usr/bin/irb"
    gem:          "/usr/bin/gem"
    rake:         "/home/pragone/.rvm/bin/rake"

  environment:
    PATH:         "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/home/pragone/.rvm/bin"
    GEM_HOME:     ""
    GEM_PATH:     ""
    MY_RUBY_HOME: ""
    IRBRC:        ""
    RUBYOPT:      ""
    gemset:       ""

此外，使用上面列出的 PATH，我在尝试运行 rails 时得到了这个:

The program 'rails' is currently not installed.  You can install it by typing:
sudo apt-get install rails

但是，当我四处乱逛并将这些添加到我的 PATH 时，出现了上述错误:

/home/pragone/.rvm/gems/ruby-1.9.3-p125/bin
/home/pragone/.rvm/gems/ruby-1.9.3-p125/gems

我试过重新运行 ~/.rvm/scripts/rvm，但它似乎没有向我的 PATH 添加正确的路径。我还在工作安装(我的 macbook pro，运行 os x 10.7)上做了一些选择，并验证了 ~/.rvm/scripts/rvm 在工作安装中向我的 PATH 添加了项目，但不是在Ubuntu 盒子。

which rails:被黑的路径:

$ which rails
/home/pragone/.rvm/gems/ruby-1.9.3-p125/bin/rails

which rails: fresh PATH:(无响应；可能未找到)

$ which rails
$

Answer 1

似乎丢失的链接是

$ rvm use ruby-1.9.3-p125 --default

似乎已经修复了它。

PS:感谢您看到这里。为了您的娱乐，如果您还没有在 HN 上看到它(它是 python，但仍然是一个很好的笑声):https://gist.github.com/289467