在 Ruby on Rails 中阻止调用 [英] Block call in Ruby on Rails

问题描述

我正在尝试清理我的代码并摆脱很多丑陋的哈希值.在我看来，我定义了几个这样的操作:

I'm trying to clean up my code and get rid of a lot of ugly hashes. In my views I define several actions like this:

@actions = {
  :interest => {'Show interest', link_to(..), :disabled => true},
  :follow   => {'Follow this case', link_to(..)}
  ...
}

随着这些哈希值的增长，可维护性降低.我想将上述格式转换为类似的格式:

As these hashes grow, the maintainability decreases. I want to convert the above format to something like:

actions do
   item :interest, 'Show interest', link_to(..), :disabled => true
   item :follow,   'Follow',        link_to(..)
   ...
end

我如何构建我的辅助方法以允许这样做?'item' 方法最好只在 'actions' 块中可用，而不是在全局范围内.

How do I structure my helper methods to allow this? Preferably the 'item'-method should only be available in the 'actions' block and not in the global scope.

谢谢！

推荐答案

我认为这种技术被称为洁净室"，其中您有一个匿名对象，其中包含您要调用的方法，以便该方法仅可用从您的区块内:

i think this technique is called a 'clean room', where you have an anonymous object that contains the method you want to call so that the method is only available from within your block:

def actions(&block)
  cleanroom = Class.new{
    def item(*args)
      puts "these args were passed in: #{args.inspect}"
    end
  }
  cr = cleanroom.new
  cr.instance_eval &block
end

当然这个item"方法只是放置一些文本，但你可以做任何你需要的.

of course this "item" method just puts some text, but you cando whatever you need.

actions do
  item "foo", "bar", "baz"
end  #=> these args were passed in: ["foo", "bar", "baz"]

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