Please see https://github.com/rails/rails/pull/11908

On Thursday, August 10, 2017 at 5:21:34 AM UTC-4, Bruno Sofiato wrote:
>
> Hi guys. 
>
> How do you feel about an enhancement to Rails' *delegate *method that 
> enables us to define an arbitrary value which is bound to be returned 
> whenever the delegation target is *nil* ? 
>
> I've came across an use case on which I was required to do so.  What I did 
> was include the *on_nil: *option to *delegate*. I can use this new option 
> the value that should be returned. The value can be either a literal or a 
> Proc. When *on_nil *is not supplied the current behavior is followed 
> (i.e. *nil *is returned). Here is an example:
>
> class User < ActiveRecord::Base
>>   has_one :profile 
>>   delegate :age, to: :profile, allow_nil: true, on_nil: 21
>> end
>
>
>> User.new.age # 21 
>
>
> Do you guys think this would be an useful enhancement to Rails' core ?
> Best Regards
>
>
>

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