custom validation rules - custom message

Hello,

I have a model where a field needs a valudation rule to verify if the
value already exists.
The easy way to implement this is by using the isUnique validation.

However I want to also modify the message the user gets to give him an
url to a location where that value/field is already used.
So instead of a message like "Sorry this is already used."
I want to tell "Sorry this is already used, check out this place {URL}
to see it."

I tried to play with the $this variable in a custom validation,
however
$this->validate['value']['unique']['message'] = "foo";
doesn't change the message when I set it from inside the validation
rule.

function signatureExists($check) {
debug($this->validate);
$this->validate['value']['unique']['message'] = "foo";
return $this->isUnique($check);
}

Is there a (supported or unsupported) way to change the validation
rule?
Of course I'd like to keep it in my model and not in my view for
cleanness of code.

Thanks a lot for your expertise.
Have a great day

Christophe

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