我正在使用activeadmin gem，它应该在你进行bundle安装时安装sass。当我做一个捆绑秀时，我可以看到sass（3.2.5）存在。但是，当我从my：assets组中删除sass时，我的rake命令无法发出异常：
rake aborted!
cannot load such file -- sass-rails
/Users/kc025858/webApp/data-source-onboarding/vendor/cache/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/dependencies.rb:251:in `require'
/Users/kc025858/webApp/data-source-onboarding/vendor/cache/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/dependencies.rb:251:in `block in require'
/Users/kc025858/webApp/data-source-onboarding/vendor/cache/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/dependencies.rb:236:in `load_dependency'
/Users/kc025858/webApp/data-source-onboarding/vendor/cache/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/dependencies.rb:251:in `require'
/Users/kc025858/webApp/data-source-onboarding/vendor/cache/ruby/1.9.1/gems/activeadmin-0.5.1/lib/active_admin/sass/helpers.rb:3:in `<top (required)>'
/Users/kc025858/webApp/data-source-onboarding/vendor/cache/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/dependencies.rb:251:in `require'
/Users/kc025858/webApp/data-source-onboarding/vendor/cache/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/dependencies.rb:251:in `block in require'
/Users/kc025858/webApp/data-source-onboarding/vendor/cache/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/dependencies.rb:236:in `load_dependency'
/Users/kc025858/webApp/data-source-onboarding/vendor/cache/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/dependencies.rb:251:in `require'
/Users/kc025858/webApp/data-source-onboarding/vendor/cache/ruby/1.9.1/gems/activeadmin-0.5.1/lib/active_admin.rb:11:in `<top (required)>'
/Users/kc025858/webApp/data-source-onboarding/vendor/cache/ruby/1.9.1/gems/activeadmin-0.5.1/lib/activeadmin.rb:1:in `require'
/Users/kc025858/webApp/data-source-onboarding/vendor/cache/ruby/1.9.1/gems/activeadmin-0.5.1/lib/activeadmin.rb:1:in `<top (required)>'
/Users/kc025858/.rvm/gems/ruby-1.9.3-p385/gems/bundler-1.2.4/lib/bundler/runtime.rb:68:in `require'
/Users/kc025858/.rvm/gems/ruby-1.9.3-p385/gems/bundler-1.2.4/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
/Users/kc025858/.rvm/gems/ruby-1.9.3-p385/gems/bundler-1.2.4/lib/bundler/runtime.rb:66:in `each'
/Users/kc025858/.rvm/gems/ruby-1.9.3-p385/gems/bundler-1.2.4/lib/bundler/runtime.rb:66:in `block in require'
/Users/kc025858/.rvm/gems/ruby-1.9.3-p385/gems/bundler-1.2.4/lib/bundler/runtime.rb:55:in `each'
/Users/kc025858/.rvm/gems/ruby-1.9.3-p385/gems/bundler-1.2.4/lib/bundler/runtime.rb:55:in `require'
/Users/kc025858/.rvm/gems/ruby-1.9.3-p385/gems/bundler-1.2.4/lib/bundler.rb:128:in `require'
/Users/kc025858/webApp/data-source-onboarding/config/application.rb:10:in `<top (required)>'
/Users/kc025858/webApp/data-source-onboarding/Rakefile:4:in `require'
/Users/kc025858/webApp/data-source-onboarding/Rakefile:4:in `<top (required)>'
/Users/kc025858/webApp/data-source-onboarding/vendor/cache/ruby/1.9.1/gems/rake-0.9.6/lib/rake/rake_module.rb:25:in `load'
/Users/kc025858/webApp/data-source-onboarding/vendor/cache/ruby/1.9.1/gems/rake-0.9.6/lib/rake/rake_module.rb:25:in `load_rakefile'
/Users/kc025858/webApp/data-source-onboarding/vendor/cache/ruby/1.9.1/gems/rake-0.9.6/lib/rake/application.rb:604:in `raw_load_rakefile'
/Users/kc025858/webApp/data-source-onboarding/vendor/cache/ruby/1.9.1/gems/rake-0.9.6/lib/rake/application.rb:89:in `block in load_rakefile'
/Users/kc025858/webApp/data-source-onboarding/vendor/cache/ruby/1.9.1/gems/rake-0.9.6/lib/rake/application.rb:160:in `standard_exception_handling'
/Users/kc025858/webApp/data-source-onboarding/vendor/cache/ruby/1.9.1/gems/rake-0.9.6/lib/rake/application.rb:88:in `load_rakefile'
/Users/kc025858/webApp/data-source-onboarding/vendor/cache/ruby/1.9.1/gems/rake-0.9.6/lib/rake/application.rb:72:in `block in run'
/Users/kc025858/webApp/data-source-onboarding/vendor/cache/ruby/1.9.1/gems/rake-0.9.6/lib/rake/application.rb:160:in `standard_exception_handling'
/Users/kc025858/webApp/data-source-onboarding/vendor/cache/ruby/1.9.1/gems/rake-0.9.6/lib/rake/application.rb:70:in `run'
/Users/kc025858/webApp/data-source-onboarding/vendor/cache/ruby/1.9.1/gems/rake-0.9.6/bin/rake:37:in `<top (required)>'
/Users/kc025858/.rvm/gems/ruby-1.9.3-p385@global/bin/rake:19:in `load'
/Users/kc025858/.rvm/gems/ruby-1.9.3-p385@global/bin/rake:19:in `<main>'
/Users/kc025858/.rvm/gems/ruby-1.9.3-p385/bin/ruby_noexec_wrapper:14:in `eval'
/Users/kc025858/.rvm/gems/ruby-1.9.3-p385/bin/ruby_noexec_wrapper:14:in `<main>
为什么在已经包含ActiveAdmin时需要将sass包含在gem gem文件中？
如果你看到dependency.txt，你会发现sass是activeadmin的一部分。
activeadmin (0.5.1)
arbre (>= 1.0.1)
bourbon (>= 1.0.0)
devise (>= 1.1.2)
fastercsv
formtastic (>= 2.0.0)
inherited_resources (>= 1.3.1)
jquery-rails (>= 1.0.0)
kaminari (>= 0.13.0)
meta_search (>= 0.9.2)
rails (>= 3.0.0)
sass (>= 3.1.0)
答案 0 :(得分：0)
不确定原因，但ActiveAdmin的网站在其文档中明确指出您需要在gemfile中包含sass-rails：
If you are using Rails >= 3.1, you must also include a beta version of MetaSearch and sass-rails
答案 1 :(得分：0)
ActiveAdmin在其依赖项列表中有sass但不是sass-rails，这是在rails资产管道中添加sass适配器所必需的。