Rails - Apr 2008 - How to does validates_uniqueness with option :unless work ?

Hi,

I am quite confuse with validates_uniqueness with option :unless.
Correct me if I''m wrong, the :unless => :method option enables
validation to happen to all except that particular method. But when I
used the unless option, it seems to have stop the validating of
uniqueness for all other methods, like :save or :update. Is there a way
to not validate uniqueness in only one action?

Thanks.


Example:
.....In a model.........
validates_uniqueness_of :name, :unless => :deep_clone

   def deep_clone

     result = self.clone

     self.children.each { |c| result.children << c.deep_clone}

     result

   end
-- 
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On Apr 16, 6:16 am, user splash
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> Hi,
>
> I am quite confuse with validates_uniqueness with option :unless.
> Correct me if I''m wrong, the :unless => :method option enables
> validation to happen to all except that particular method. But when I
> used the unless option, it seems to have stop the validating of
> uniqueness for all other methods, like :save or :update. Is there a way
> to not validate uniqueness in only one action?
>
unless means the validation does not run if the specified method
returns true. Your deep_clone method always returns true so the
validation never runs. It has nothing to do with who caused the
validation to be called or which controller action is being processed.

Fred
> Thanks.
>
> Example:
> .....In a model.........
> validates_uniqueness_of :name, :unless => :deep_clone
>
>    def deep_clone
>
>      result = self.clone
>
>      self.children.each { |c| result.children << c.deep_clone}
>
>      result
>
>    end
> --
> Posted viahttp://www.ruby-forum.com/.
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Frederick Cheung wrote:
> On Apr 16, 6:16�am, user splash
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
> wrote:
> unless means the validation does not run if the specified method
> returns true. Your deep_clone method always returns true so the
> validation never runs. It has nothing to do with who caused the
> validation to be called or which controller action is being processed.
> 
> Fred
Hi,

So is it right to say that if the specified method returns true, the 
validation does not run at all?

What should I do if I want the validation to run only when I create or 
update a record and not when I copy a record? Can I still use the unless 
option? If yes how?

Thanks
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On 17 Apr 2008, at 09:34, user splash wrote:
>
> Frederick Cheung wrote:
>> On Apr 16, 6:16�am, user splash
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
>> wrote:
>> unless means the validation does not run if the specified method
>> returns true. Your deep_clone method always returns true so the
>> validation never runs. It has nothing to do with who caused the
>> validation to be called or which controller action is being  
>> processed.
>>
>> Fred
>
> Hi,
>
> So is it right to say that if the specified method returns true, the
> validation does not run at all?
yes
>
> What should I do if I want the validation to run only when I create or
> update a record and not when I copy a record? Can I still use the  
> unless
> option? If yes how?
>
There''s the :on option which distinguishes between updates and  
creates, but that won''t help you here (since copy isn''t
something AR
knows about).

Have a method that returns true when that is the case (that method can  
be as simple as an attr_accessor which you set to true when relevant)

Fred
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Frederick Cheung wrote:
> On 17 Apr 2008, at 09:34, user splash wrote:
>>
> There''s the :on option which distinguishes between updates and
> creates, but that won''t help you here (since copy isn''t
something AR
> knows about).
> 
> Have a method that returns true when that is the case (that method can
> be as simple as an attr_accessor which you set to true when relevant)
> 
> Fred

Thanks Fred. It works.
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