From: Brian Candler <b.candler@...>
Date: 2010-07-12T06:00:38+09:00
Subject: Re: How to pass a hash as a param to a method called through eval?

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.
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