From: Brian Candler <b.candler@...>
Date: 2010-07-12T05:47:10+09:00
Subject: Re: How to pass a hash as a param to a method called through eval?

Alex Stahl wrote:
> Hi Folks - I've got a data-driven app I'm building, and I'd like to be
> able to read a set of data from a json file, pass that to eval, and have
> it executed:
> 
> json:
> {
>   "action": "someFunc",
>   "params": {
>     "a": "foo",
>     "b": "bar",
>     "c": "etc"
>   }
> }
> 
> call = JSON.parse(json)
> eval("#{call['action']} #{call['params']}")

I'm pretty sure that what you really want is this:

   send(call['action'], call['params'])

For simple cases you might be able to work with eval, like this:

   eval("#{call['action']} #{call['params'].inspect}")

But that's fragile, slow, and fraught with security dangers. If what you 
want is to call a method whose name is in a variable, then the tool is 
provided to do that: 'send'
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