Rails - Jul 2005 - Anything like (lineitem.product.title)?if_exists in freemarker?

hello all,
do rails have Anything like (lineitem.product.title)?if_exists in 
freemarker?
in freemarker if lineitem.product is null 
(lineitem.product.title)?if_exists would produce nothing,
but in rails <%= lineitem.product.title %> would report
error 
"undefined method `title'' for nil:NilClass"
so how can I handle this situation when lineitem.product is 
sometimes null?


_______________________________________________
Rails mailing list
Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
http://lists.rubyonrails.org/mailman/listinfo/rails

On 16.7.2005, at 13:56, femtowin femtowin wrote:
> hello all,
> do rails have Anything like (lineitem.product.title)?if_exists in 
> freemarker?
> in freemarker if lineitem.product is null
> (lineitem.product.title)?if_exists would produce nothing,
> but in rails <%= lineitem.product.title %> would report
> error
> "undefined method `title'' for nil:NilClass"
> so how can I handle this situation when lineitem.product is
> sometimes null?
respond_to? [1] is probably what you''re after.

http://raildock.mytechsupport.com/ri/respond_to?

//jarkko
> _______________________________________________
> Rails mailing list
> Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>
--
Jarkko Laine
http://jlaine.net
http://odesign.fi


_______________________________________________
Rails mailing list
Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
http://lists.rubyonrails.org/mailman/listinfo/rails

On Sat, 2005-07-16 at 18:56 +0800, femtowin femtowin
wrote:
> hello all,
> do rails have Anything like (lineitem.product.title)?if_exists in
> freemarker?
I think this will work. It came up on this list just a very few days
ago. Might be worthy of a Wiki entry when I''m running on more sleep.

  @title =(lineitem.product.title rescue nil)
   unless @title ==nil # do what you want with title

jarkko, wouldn''t respond_to? simply confirm if title is an attribute or
no, regardless of it being nil, or not?

Howard

<%=lineitem.product.title rescue nil %>would do and 
generate nothing when product is nil.
thanks.

@title =(lineitem.product.title rescue nil)
  unless @title ==nil # do what you want with title

I guess you mean writing code in controller,
but my situation is in rhtml and I''m in a loop iterating
lineitems, so set @title wouldn''t be a valid 
choice.






On 7/16/05, Lord Khaos <lordkhaos-Wuw85uim5zDR7s880joybQ@public.gmane.org>
wrote:
> On Sat, 2005-07-16 at 18:56 +0800, femtowin femtowin wrote:
> > hello all,
> > do rails have Anything like (lineitem.product.title)?if_exists in
> > freemarker?
> I think this will work. It came up on this list just a very few days
> ago. Might be worthy of a Wiki entry when I''m running on more
sleep.
> 
> @title =(lineitem.product.title rescue nil)
>   unless @title ==nil # do what you want with title
> 
> jarkko, wouldn''t respond_to? simply confirm if title is an
attribute or
> no, regardless of it being nil, or not?
> 
> Howard
> 
> 
> 
>

On 16.7.2005, at 14:23, Lord Khaos wrote:
>
> jarkko, wouldn''t respond_to? simply confirm if title is an
attribute or
> no, regardless of it being nil, or not?
Oh yes, sorry, I was too hasty to just read the NoMethodError.

//jarkko


--
Jarkko Laine
http://jlaine.net
http://odesign.fi


_______________________________________________
Rails mailing list
Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
http://lists.rubyonrails.org/mailman/listinfo/rails