From: Iain Barnett <iainspeed@...>
Date: 2010-09-29T01:42:19+09:00
Subject: Re: error message, undefined method in Set


On 28 Sep 2010, at 07:11, Brian Candler wrote:

> Iain Barnett wrote:
>> but this throws errors:
>> 
>> require 'choice'
>> require 'set'
> 
> Then at the top of choice.rb I'd put require 'set'.

That's what I was originally doing, but a lot of the advice I've read on structuring projects is to remove the requires from individual classes/files and put them in a central file with the name of the app under lib. 


> 
>> I'm very surprised that the order of requires (at the top of a file) can 
>> affect anything in this way. Is this the way it's supposed be? If not, 
>> what could be the cause?
> 
> It can be. Imagine this:
> 
> --- set.rb ---
> class Set < Hash
>  ...
> end
> 
> --- choice.rb ---
> class Set
>  ... add some more methods to the class
> end
> 
> If you require choice.rb first, you would get an exception when 
> requiring set.rb

Ok, thanks. It's good to know gotchas!

Regards,
Iain