红宝石 - 使用包括case语句

Question

我用这样的方法：

case referer 
     when (referer.include? "some_string") 
     redirect_link = edit_product_path 
     when (referer.include? "some_other_string") 
     redirect_link = other_product_path 
end 

不幸的是，这将返回零，即使串some_string出现在变量referer。

这里就是我试图用Ruby控制台：

ruby-1.8.7-p334 :006 > jasdeep = "RAILS" 
ruby-1.8.7-p334 :026 > case jasdeep 
ruby-1.8.7-p334 :027?> when (jasdeep.include? "AI") 
ruby-1.8.7-p334 :028?> puts "Hello" 
ruby-1.8.7-p334 :029?> end 
=> nil 

任何输入将不胜感激。

Answer 1

试试这个

jasdeep = "RAILS" 
case jasdeep 
when /IL/ 
    puts "Hello" 
end 

Answer 2

nil是puts语句的返回值，而不是.include ?.尝试从控制台单独运行下面的两个语句，并观察返回值：

jasdeep.include? "AI" 

puts "hello" 

Answer 3

jasdeep = "RAILS" 

case 
    when jasdeep.include?("AI") 
    puts "Hello" 
end 

Answer 4

case true 
when referer.include? "some_string" 
    redirect_link = edit_product_path 
when referer.include? "some_other_string" 
    redirect_link = other_product_path 
end