为什么我可以使用irb的RMagick而不是rails console？

Question

ruby 1.9.2p320 rails 3.0.8 Fedora发布16(Verne)

做的:

yum install imagemagick yum install ImageMagick-devel gem安装RMagick完全没有问题

我可以从独立的Ruby程序运行RMagick,但Ruby in Rails(使用相同的解释器)找不到RMagick:

gremlin:eric cars01 $ irb
irb(main):001:0> require 'RMagick'
=> true
irb(main):002:0> Magick::Version
=> "RMagick 2.13.1"
irb(main):003:0> $".grep(/Magick/)
=> ["/usr/local/lib/ruby/gems/1.9.1/gems/rmagick-2.13.1/lib/RMagick2.so", "/usr/local/lib/ruby/gems/1.9.1/gems/rmagick-2.13.1/lib/RMagick.rb"]
irb(main):004:0> 
gremlin:eric cars01 $ rails console
Loading development environment (Rails 3.0.8)
irb(main):001:0> require 'rubygems'
=> nil
irb(main):002:0> require 'RMagick'
LoadError: no such file to load -- RMagick
    from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.0.8/lib/active_support/dependencies.rb:239:in `require'
    from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.0.8/lib/active_support/dependencies.rb:239:in `block in require'
    from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.0.8/lib/active_support/dependencies.rb:225:in `block in load_dependency'
    from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.0.8/lib/active_support/dependencies.rb:596:in `new_constants_in'
    from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.0.8/lib/active_support/dependencies.rb:225:in `load_dependency'
    from /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.0.8/lib/active_support/dependencies.rb:239:in `require'
    from (irb):2
    from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.0.8/lib/rails/commands/console.rb:44:in `start'
    from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.0.8/lib/rails/commands/console.rb:8:in `start'
    from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.0.8/lib/rails/commands.rb:23:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `'

如果我把RMagick放在Gemfile中,无论有没有版本,bundle说它无法在机器上找到gem.但它适用于其他宝石.

任何人都有任何想法为什么Ruby可以在Rails之外加载RMagick但不在其中？

与此同时,在加载它之前将路径推到RMagick的超酷解决方法是有效的.

Answer 1

在你的 Gemfile 中添加这一行

gem "rmagick"

然后bundle install