Rails - Apr 2006 - Variable not evaluating, returning nil object

There is probably a simple answer to this, but I''m fairly new to rails.

 

Any idea why the variable "b" won''t evaluate on this line?

 

<%=image_tag(thumbnail(items[b].catalognum,
192),:alt=>items[b].view_description,:border=>0)%>

 

If I change it to:

 

<%=image_tag(thumbnail(items[0].catalognum,
192),:alt=>items[0].view_description,:border=>0)%>

 

It works fine, and if I append the value of b at the end it prints on
the screen as the correct value (0). But, it''s insisting that there is
a
nil object.

 

 

"You have a nil object when you didn''t expect it!
The error occured while evaluating nil.catalognum"

 

 

Thank you,

 

Nestor Marchante

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL:
http://wrath.rubyonrails.org/pipermail/rails/attachments/20060411/ee45f948/attachment-0001.html

That doesn''t tell you that b is nil; that tells you that items[b] is  
nil. Are you absolutely sure that the value of b is an integer zero?  
It could, for example, be the string "0"? What if you change items[b]
to items[b.to_i]?

Pete Yandell
http://9cays.com

On 12/04/2006, at 8:43 AM, Nestor Marchante wrote:
> There is probably a simple answer to this, but I?m fairly new to  
> rails.
>
>
> Any idea why the variable ?b? won?t evaluate on this line?
>
>
> <%=image_tag(thumbnail(items[b].catalognum, 192),:alt=>items 
> [b].view_description,:border=>0)%>
>
>
> If I change it to:
>
>
> <%=image_tag(thumbnail(items[0].catalognum, 192),:alt=>items 
> [0].view_description,:border=>0)%>
>
>
> It works fine, and if I append the value of b at the end it prints  
> on the screen as the correct value (0). But, it?s insisting that  
> there is a nil object.
>
>
>
> ?You have a nil object when you didn''t expect it!The error occured
> while evaluating nil.catalognum?