Rails - Apr 2006 - Handle null item

Hi,

How to i handle a find that returns a null?

Say i put 40 into the paramter id below and there is no post with an id 
of 40
i get an error saying no post exists with id

@post = Post.find(params[:id])

Anyone help??

-- 
Posted via http://www.ruby-forum.com/.

wrap your code around :

@post = Post.find(params[:id])
if @post
  # do great things
end

On Wednesday 12 April 2006 6:54 pm, John Butler wrote:
> Hi,
>
> How to i handle a find that returns a null?
>
> Say i put 40 into the paramter id below and there is no post with an id
> of 40
> i get an error saying no post exists with id
>
> @post = Post.find(params[:id])
>
> Anyone help??

That won''t work either.  Try one of these:

begin
   @post = Post.find(params[:id])
   # use the @post that was found
rescue
   # do something about a non-existant record
end

#-OR-

if @post = Post.find_by_id(params[:id])
   # use the @post that was found
else
   # do something about a non-existant record
end

The dynamic finders (find_by_id in this case) return nil, but find  
raises an exception.

-Rob

Rob Biedenharn		http://agileconsultingllc.com
Rob@AgileConsultingLLC.com
+1 513-295-4739


On Apr 12, 2006, at 9:28 AM, hemant kumar wrote:
> wrap your code around :
>
> @post = Post.find(params[:id])
> if @post
>   # do great things
> end
>
> On Wednesday 12 April 2006 6:54 pm, John Butler wrote:
>> Hi,
>>
>> How to i handle a find that returns a null?
>>
>> Say i put 40 into the paramter id below and there is no post with  
>> an id
>> of 40
>> i get an error saying no post exists with id
>>
>> @post = Post.find(params[:id])
>>
>> Anyone help??
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