From: Martin DeMello <martindemello@...>
Date: 2006-12-07T02:36:39+09:00
Subject: Re: Difference between nil? vs. (variable != nil)...

On 12/6/06, Jason  Vogel <jasonvogel@gmail.com> wrote:
> Source A :
>
> if (@product_coverages != nil && @product_coverages.length > 0)
>       @product_coverages = @product_coverages.each do
> |product_coverage|
>         product_coverage.external_description =
> Coverage.find(product_coverage.coverage_id).external_description # test
>         if (product_coverage.external_description != nil)
>           product_coverage.external_description.capitalize!
>         end
>       end
>     end
>
> Source B :
>
> if (@product_coverages != nil && @product_coverages.length > 0)
>       @product_coverages = @product_coverages.each do
> |product_coverage|
>         product_coverage.external_description =
> Coverage.find(product_coverage.coverage_id).external_description # test
>         return "" if product_coverage.external_description.nil?
>         product_coverage.external_description.capitalize!
>       end
>     end
>
> I wanted to use Source B, but it return "" everytime.  But Source A
> works.  I expected both of them to work.

Put in a test print, to see what nil? is returning. It is possible for
a class to override nil?, though it's hard to think of why one would.

martin