Rails - Jul 2007 - How to restrict deletion of ActiveRecord objects if there dependent records?

Hi guys,

Trying to find some way to restrict deletion of ActiveRecord objects
if there dependent records.

I''m thinking of using before_destroy for it, but don''t know
how to
"cancel" deletion in my code in before_destroy "decides"
that deletion
should be restricted.


Thank you in advance.

--
Regards
Yuriy Padlyak


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gneeot wrote:
> 
> I''m thinking of using before_destroy for it, but don''t
know how to
> "cancel" deletion in my code in before_destroy
"decides" that deletion
> should be restricted.
> 
According to the Rails doc, all you need to do is return false from your 
before_destroy method. Here''s the relevant section:

  # == Cancelling callbacks
  #
  # If a before_* callback returns false, all the later callbacks and 
the associated action are cancelled. If an after_* callback returns
  # false, all the later callbacks are cancelled. Callbacks are 
generally run in the order they are defined, with the exception of 
callbacks
  # defined as methods on the model, which are called last.


Hope this helps,

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

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Hi Yuryi,
> Trying to find some way to restrict deletion of ActiveRecord objects
> if there dependent records.
>
> I''m thinking of using before_destroy for it, but don''t
know how to
> "cancel" deletion in my code in before_destroy
"decides" that deletion
> should be restricted.
I''m pretty sure that if a "before_" filter returns false, the
whole action
is canceled.  Check the class docs at api.rubyonrails.org to be sure.

HTH,
Bill



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thanks, will try it.

On Jul 30, 5:42 am, "Bill Walton"
<bill.wal...-xwVYE8SWAR3R7s880joybQ@public.gmane.org>
wrote:
> Hi Yuryi,
>
> > Trying to find some way to restrict deletion of ActiveRecord objects
> > if there dependent records.
>
> > I''m thinking of using before_destroy for it, but
don''t know how to
> > "cancel" deletion in my code in before_destroy
"decides" that deletion
> > should be restricted.
>
> I''m pretty sure that if a "before_" filter returns
false, the whole action
> is canceled.  Check the class docs at api.rubyonrails.org to be sure.
>
> HTH,
> Bill

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it works great, thank you.

On Jul 30, 11:42 am, gneeot
<YuraPadl...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> thanks, will try it.
>
> On Jul 30, 5:42 am, "Bill Walton"
<bill.wal...-xwVYE8SWAR3R7s880joybQ@public.gmane.org> wrote:
>
> > Hi Yuryi,
>
> > > Trying to find some way to restrict deletion of ActiveRecord
objects
> > > if there dependent records.
>
> > > I''m thinking of using before_destroy for it, but
don''t know how to
> > > "cancel" deletion in my code in before_destroy
"decides" that deletion
> > > should be restricted.
>
> > I''m pretty sure that if a "before_" filter returns
false, the whole action
> > is canceled.  Check the class docs at api.rubyonrails.org to be sure.
>
> > HTH,
> > Bill

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