ruby-on-rails – 如何在rails函数中创建动态变量？

概述我有这个代码正在工作： case index when "Books" @reading_img = res.items.first.get_hash('MediumImage')["URL"] # don't show an image @reading_link = create_amz_url(search, asin) tempy = 我有这个代码正在工作：

case index   when "Books"     @reading_img = res.items.first.get_hash('MediumImage')["URL"] # don't show an image     @reading_link = create_amz_url(search,asin)             tempy = @Nowreading.content.match(/#Nowreading.*/).to_s.gsub("#Nowreading",'') # strips away the #Nowreading tag     @Nowreading.content = tempy.match(/#{search}.*/).to_s.gsub("#{search}",@reading_link)      # replaces the book Title (passed in as variable 'search') with the URL'ed Title   when "Music"     @Listening_img = res.items.first.get_hash('MediumImage')["URL"] # don't show an image     @Listening_link = create_amz_url(search,asin)             tempy = @NowListening.content.match(/#NowListening.*/).to_s.gsub("#NowListening",'') # strips away the #Nowreading tag     @NowListening.content = tempy.match(/#{search}.*/).to_s.gsub("#{search}",@Listening_link)      # replaces the song Title (passed in as variable 'search') with the URL'ed Title          end

我需要为很多很多类别重复这一点.我尝试过这样的东西来干掉代码,但它不起作用：

def get_img_and_links(act,res,search,asin)        '@'+act+'ing_img' = res.items.first.get_hash('MediumImage')["URL"] # don't show an image        '@'+act+'ing_link' = create_amz_url(search,asin)                tempy = '@Now'+act+'ing'.content.match(/#Now"#{act}"ing.*/).to_s.gsub("#Now#{act}ing",'') # strips away the #Nowreading tag        '@Now'+act+'ing'.content = tempy.match(/#{search}.*/).to_s.gsub("#{search}",'@'+act+'ing_link')         # replaces the book Title (passed in as variable 'search') with the URL'ed Title     end

本质上,我试图创建一个采取“行为”(例如,“阅读”,“收听”等)的函数,并使该函数内的变量是动态的.这可以实现吗？如果是这样,怎么样？

解决方法 在这里查找instance_variable_set： http://ruby-doc.org/core/classes/Object.html.这是动态创建这些变量所需的.

instance_variable_set "@#{act}ing_img".to_sym,res.items.first.get_hash('MediumImage')["URL"]

等等…

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