From: Alex Stahl <astahl@...5.com>
Date: 2010-07-12T04:57:20+09:00
Subject: How to pass a hash as a param to a method called through eval?

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']}")


Problem is that 'call['params']' is treated as a string by the receiver,
not the hash I intended to pass.  Tried using casting operations first,
like .to_s and then .to_hash, but the to_hash call fails w/ no method
error.  Instead the hash comes through as a string.  How can I pass it
so that it remains a hash, and retains its structure for key/val reading
in the receiver?

Thanks,
Alex