用acts_as_rateable实现简单的打分功能
acts_as_rateable插件为ActiveRecord模型对象提供评分/评级的功能，下面的示例是一个简单的打分功能。
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1、安装插件
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<%= stars(@entry, :filled_star => "X", :empty_star => "x") do |content,rating,filled| link_to content, :controller => "entries", :action => "rating", :id => @entry.id, :rating => ratingend%>
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