Ruby on Rails

On 12 April 2016 at 08:52, Naveed Alam <lists@ruby-forum.com> wrote:
>> As a beginner I suggest you work right through a good tutorial in
>> order to get the basics or Rails. The one I suggest is
>> railstutorial.org (which is free to use online).
>>
>> Colin
>
> Thanks colin I already tried this but it give me the error:
>
> undefined method `company_name' for nil:NilClass

Please quote the previous message when posting, this is a mailing list
not a forum (though you may be accessing it via a forum like
interface).

If the statement
category.supplier.company_name
gives the error undefined method `company_name' for nil:NilClass then
that means that category.supplier is nil, or to put it another way, it
means that category does not have an associated supplier. You
probably need something like
<td><%= category.supplier.company_name if category.supplier %></td>
which will only attempt to determine the name if category.supplier is not nil

Colin

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