Rails - May 2006 - validates_uniqueness_of but only when exists

I want to validate the uniqueness of a field if the field has a value. 
Is there anyway to do it?

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Glenn Cadman wrote:
> I want to validate the uniqueness of a field if the field has a value. 
> Is there anyway to do it?
Sure, you can use the following syntax:

validates_presence_of :field, :if => ..

So you can do anything you would do in a normal if.

David

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David wrote:
> Glenn Cadman wrote:
>> I want to validate the uniqueness of a field if the field has a value. 
>> Is there anyway to do it?
> 
> Sure, you can use the following syntax:
> 
> validates_presence_of :field, :if => ..
> 
> So you can do anything you would do in a normal if.
> 
> David
Thanks, working well.

validates_uniqueness_of :employeenumber,  :if => employeenumber?


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