Rails - Oct 2008 - Rails console

I tried to create an addition to Enumerable called choose_randomly
that picks a random element from the Enumerable object. However when I
define it and execute the code rand complains about the wrong number
of arguments. Below is a capture of the ./script/console session.

farrel@nicodemus ~/Work/GreenGreen/Code/green_green_client_application
$ ./script/console
Loading development environment (Rails 2.1.2)
>> [1,2,3].choose_randomly
NoMethodError: undefined method `choose_randomly'' for [1, 2, 3]:Array
	from (irb):1
>> module Enumerable
>>   def choose_randomly
>>     array_of_self = Array( self )
>>     index = rand( array_of_self.size )
>>     array_of_self[ index ]
>>   end
>> end
=> nil
>> [1,2,3].choose_randomly
ArgumentError: wrong number of arguments (1 for 0)
	from (irb):5:in `rand''
	from (irb):5:in `choose_randomly''
	from (irb):9
>> [1,2,3][ rand( [1,2,3].size )]
=> 1

As you can see if I execute the code myself it seems to work. If I
copy that same code into irb it works perfectly.

Any ideas?

Farrel
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---

On 30 Oct 2008, at 16:22, Farrel wrote:
>
>
> As you can see if I execute the code myself it seems to work. If I
> copy that same code into irb it works perfectly.
>
You''re calling Array#rand (a private method Array defines), whereas  
you want to call Kernel#rand. Replace rand with Kernel.rand and you  
should be ok

Fred
> Any ideas?
>
> Farrel
> >

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---

On Oct 30, 7:05 pm, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> You''re calling Array#rand (a private method Array defines),
whereas
> you want to call Kernel#rand. Replace rand with Kernel.rand and you
> should be ok
That was it. Thanks for the tip. I didn''t know Rails added in
it''s own
rand method into Array.

Farrel
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---