使用方法名称inRuby [duplicate]的字符串/变量调用方法

Possible Duplicate:
How to turn a string into a method call?

可能重复:如何将字符串转换为方法调用?

Currently I have a code that is doing something like this

目前我有一个类似这样的代码

def execute
  case @command
    when "sing"
      sing()
    when "ping"
      user_defined_ping()
    when "--help|-h|help"
      get_usage()      
end

I find the case pretty useless and huge and I had like to call the appropriate method just by using the variable @command. Something like:

我发现这个例子非常无用，而且很大，我喜欢通过使用变量@command调用适当的方法。喜欢的东西:

def execute
 @command()
end

Offcourse I would not need and extra execute() method in this case.

当然，在这种情况下，我不需要和额外的execute()方法。

Any suggestions on how I can acheive this ruby ?

关于如何完成这个ruby有什么建议吗?

Thanks!

谢谢!

Edit: Added other method type for multiple strings. Not sure if that can also be handled in an elegant manner.

编辑:为多个字符串添加其他方法类型。不确定这是否也能以一种优雅的方式处理。

2 个解决方案

#1

Check out send

查看发送

send(@command) if respond_to?(@command)

发送(@command)如果respond_to ?(@command)

The respond_to? ensures that self responds to this method before attempting to execute it

respond_to吗?确保self在尝试执行此方法之前对其做出响应

For the updated get_usage() part I would use something similar to this:

对于更新后的get_usage()部分，我将使用类似以下内容:

def execute
  case @command
  when '--help', '-h', 'help'
    get_usage()
  # more possibilities
  else
    if respond_to?(@command)
      send(@command)
    else
      puts "Unknown command ..."
    end
  end
end

#2

You are looking for send probably. Take a look at this: http://ruby-doc.org/core/classes/Object.html#M000999

您可能正在寻找发送。看看这个:http://ruby-doc.org/core/classes/Object.html#M000999

def execute
    send @command
end

#1