Ruby on Rails

Colin Law wrote in post #1182787:
> 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

Sory none of them worked, pls chk my app,
https://www.dropbox.com/s/siioqa8q8xkdf46/tPOS.zip?dl=0

thanks.

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