From: Farrel Lifson <farrel.lifson@...>
Date: 2006-08-30T01:10:54+09:00
Subject: Re: Testing a string's value is a positive integer

On 29/08/06, James Deuchar <jamesdeuchar@hotmail.com> wrote:
> Hi,
>
> I'm trying to find an nice way of verifying that the value of a String
> object (from the RoR params) contains a positive integer value.
>
> Casting my string to_i and then testing that it is_a(Numeric) and is > 0
> doesn't do the trick because the to_i method converts something like
> '1.1' to a Fixnum of value 1 which would then pass the test when it
> shouldn't...
>
> I feel certain I must be missing a trick here...am about to go down the
> path of regexp which feels...wrong?
>
> Any advice for a newcomer would be gratefully received!
>
> Thanks
>
> James
>
>
>
> --
> Posted via http://www.ruby-forum.com/.
>
>

Check if num.to_f - num.to_i == 0, if that's true you're dealing with
a integer otherwise a float.

Farrel