按照：http://ruby-china.org/topics/2661 Rails 版本 3.2.5
NoMethodError in Homeland::TopicsController#index
undefined method `key?' for nil:NilClass
couldn't find file 'jquery.atwho'
(in /usr/local/rvm/gems/ruby-1.9.3-p194/gems/homeland-0.0.6/app/assets/stylesheets/homeland.scss:2)
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