Rails - Aug 2007 - Rails exception catching

Hello I''m writting my first rails application and I would like to catch
when an id cant be found.
For instance  have create records 1 2 and 3

I would like to:
 records=Record.find(4)
and not get the error page rather somthing like

records=Record.find(4)

if (records==nil)
...
   do stuff
...
else
...
   do other stuf
...
end
-- 
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On 8/11/07, Dehmlowm-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org Mr
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
>
> Hello I''m writting my first rails application and I would like to
catch
> when an id cant be found.
> For instance  have create records 1 2 and 3
>
> I would like to:
>  records=Record.find(4)
> and not get the error page rather somthing like
>
> records=Record.find(4)
>
> if (records==nil)
> ...
>    do stuff
> ...
> else
> ...
>    do other stuf
> ...
> end
You use rescue and read this chapter about Ruby Exceptions [1].

Good luck!

[1] http://www.rubycentral.com/pickaxe/tut_exceptions.html

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Mike De wrote:
> Hello I''m writting my first rails application and I would like to
catch
> when an id cant be found.
> For instance  have create records 1 2 and 3
> 
> I would like to:
>  records=Record.find(4)
> and not get the error page rather somthing like
> 
> records=Record.find(4)
> 
> if (records==nil)
> ...
>    do stuff
> ...
> else
> ...
>    do other stuf
> ...
> end
You probably want something like:

begin
  record = Record.find(14)
rescue ActiveRecord::RecordNotFound
  puts ''Record 14 not Found!''
end
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Thank you both perfect.

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

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Mike De wrote:
> Hello I''m writting my first rails application and I would like to
catch
> when an id cant be found.
> For instance  have create records 1 2 and 3
> 
> I would like to:
>  records=Record.find(4)
> and not get the error page rather somthing like
> 
> records=Record.find(4)
> 
> if (records==nil)
> ...
>    do stuff
> ...
> else
> ...
>    do other stuf
> ...
> end
Here''s the thing: the reason that AR is throwing an exception when that
fails is because you''re specifically giving it an ID. The assumption is
that you have an ID, you know the record exists, and therefore if it 
can''t be found, it''s an exceptional situation.

If the records attached to those IDs are going away for some reason, 
either you are stuck using a rescue, or perhaps you can refactor your 
problem so that you are making sure whatever dangling objects still have 
those ids are cleaned up before you actually try to find them.
-- 
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