Rails - May 2006 - How to check an input String is a number or not in ruby?

How to check an input String is a number or not in ruby?
Thanks in advance,
Joshua

-- 
Posted via http://www.ruby-forum.com/.

Hi Joshua,

joshua asem wrote:
> How to check an input String is a number or not in ruby?
First, I''m going to assume you''re asking about how to do that
in a Rails app
as opposed to straight Ruby.  If you''re looking for Ruby language
support, a
better place to ask your question would be 
http://groups.google.com/group/comp.lang.ruby

You didn''t say whether you want / need to check it on the client- or on
the
server-side.

If server-side works for you, and it''s definitely the easiest, check
the
documentation on validates_numericality_of at http://api.rubyonrails.org/. 
You''d use that validation in your model.

If client-side, you''ll probably want to use pattern matching in a 
Javascript.  What pattern you''d validate against would depend on the
format
you''re expecting / allowing.  The documentation at 
http://api.rubyonrails.com/classes/ActionView/Helpers/JavaScriptHelper.html 
should help you understand how to include the JS in your Rails app.

hth,
Bill

Hi,
  Thanks for your suggestion,
  But the exact thing i want is to validate using ruby script not the 
javascript and also not the validates_numericality_of. As I was coding 
differently little bit to support legacy database and without using the 
model directly. The results get returned from the stored procs in the 
hash form.
  So i just wanted to do it generally using ruby script.
  If you have the idea in ruby script , exactly the piece of code for 
validating number like isNumber(). Please reply with small piece of code 
if you don;t mind

Thanks in advance.
joshua...

-- 
Posted via http://www.ruby-forum.com/.

Try these

http://pleac.sourceforge.net/pleac_ruby/numbers.html

HTH 

Ross

> -----Original Message-----
> From: rails-bounces@lists.rubyonrails.org
> [mailto:rails-bounces@lists.rubyonrails.org]On Behalf Of joshua asem
> Sent: Monday, 22 May 2006 3:16 PM
> To: rails@lists.rubyonrails.org
> Subject: [Rails] Re: How to check an input String is a number 
> or not in
> ruby?
> 
> 
> Hi,
>   Thanks for your suggestion,
>   But the exact thing i want is to validate using ruby script not the 
> javascript and also not the validates_numericality_of. As I 
> was coding 
> differently little bit to support legacy database and without 
> using the 
> model directly. The results get returned from the stored procs in the 
> hash form.
>   So i just wanted to do it generally using ruby script.
>   If you have the idea in ruby script , exactly the piece of code for 
> validating number like isNumber(). Please reply with small 
> piece of code 
> if you don;t mind
> 
> Thanks in advance.
> joshua...
> 
> -- 
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>

On E, 2006-05-22 at 07:16 +0200, joshua asem wrote:
> Hi,
>   Thanks for your suggestion,
>   But the exact thing i want is to validate using ruby script not the 
> javascript and also not the validates_numericality_of. As I was coding 
> differently little bit to support legacy database and without using the 
> model directly. The results get returned from the stored procs in the 
> hash form.
>   So i just wanted to do it generally using ruby script.
>   If you have the idea in ruby script , exactly the piece of code for 
> validating number like isNumber(). Please reply with small piece of code 
> if you don;t mind
> 
> Thanks in advance.
> joshua...
> 
You can use Integer(string_containing_number) which raises an
exception if the string can not be converted to a number.

Or you could use a regular expression to check that the string
only contains a number:

if string_containing_number =~ /^\d+$/
  # is numeric, safe to use string_containing_number.to_s
  #  (which would return 0 in case of failure to convert)
else
  # not numeric
end


-- 
Tarmo T?nav <tarmo@itech.ee>