Interesting! Can you explain some uses cases?
If it makes sense I think it could be added.
If the auth_code is something that won't be set until you get a
response from your payment gateway, then why bother with this? If what
you want is to prevent users from updating this field when submitting
the payment form, use attr_protected.
> validates :comments, :absence => true, :unless => published?
I'm guessing something that isn't published usually won't be surfaced
to users, so no one will be able to comment on it. So why validate
something?
Adding a validation means adding code that runs each time you save
your object, so validations that are just there to look nice but don't
really help (because they will always be valid since there's no way
the user can break them) will only make your app slower for no real
benefit.
I'm not saying there's no use case for this (I just can't think of
any), but these particular use cases don't warrant adding anything
into core, IMO.
Cheers,
-foca
> There may in some cases be some perceived repetition along the lines
> of the code below. I'd be interested to hear people's thoughts on if
> this is acceptable. Though there is repetition I'd feel the intention
> of the code is clear.
> validates :auth_code, :presence => true, :if => :payment_complete?
> validates :auth_code, :absence => true, :unless
> => :payment_complete?
>
> On Feb 27, 9:18 am, Xavier Noria <f...@hashref.com> wrote:
>> On Mon, Feb 27, 2012 at 10:15 AM, Paul Gillard <paulmgill...@gmail.com> wrote:
>> > I often need to validate the absence of active record fields. That
>> > validation being the direct opposite of validating the presence of a
>> > field. Would the core team be willing to accept a patch to that
>> > effect?
>>
>> Interesting! Can you explain some uses cases?
>>
>> If it makes sense I think it could be added.
>
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validates :comments, :absence => true, :unless => published?
Bot trapping with hidden fields that no human would complete?
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validate :a_or_b
def a_or_b
if a? && b?
self.errors.add :a, "You can't choose both options at the same time."
end
end