From: Robert Klemme <shortcutter@...>
Date: 2010-07-13T01:25:06+09:00
Subject: Re: How to pass a hash as a param to a method called through eval?

On 11.07.2010 23:00, Brian Candler wrote:
> Just use 'puts' instead of 'eval' to see what's happening.
>
>>> json =<<EOS
> {
>    "action": "someFunc",
>    "params": {
>      "a": "foo",
>      "b": "bar",
>      "c": "etc"
>    }
> }
> EOS
> =>  "{\n  \"action\": \"someFunc\",\n  \"params\": {\n    \"a\":
> \"foo\",\n    \"b\": \"bar\",\n    \"c\": \"etc\"\n  }\n}\n"
>>> require 'rubygems'
> =>  true
>>> require 'json'
> =>  true
>>> call = JSON.parse(json)
> =>  {"action"=>"someFunc", "params"=>{"a"=>"foo", "b"=>"bar",
> "c"=>"etc"}}
>>> puts "#{call['action']} #{call['params']}"
> someFunc afoobbarcetc
> =>  nil
>>> puts "#{call['action']}('#{call['params']}')"
> someFunc('afoobbarcetc')
> =>  nil
>>>
>
> Should be pretty obvious now, remember that eval is just interpreting
> that string as a piece of ruby code.

I wouldn't even use eval here - it's unsafe and slow.  Something like 
this should work

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

Kind regards

	robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/