Multiple is_unique and set_message

[eluser]CroNiX[/eluser]
Unfortunately the error message is set by the rule name and not the individual field. I've seen some code in the wiki that let's you set it by the individual field, but haven't tried it.

You can always copy the is_unique() method into a MY_Form_validation extension and rename it to something else and set a new custom error message as a workaround. Not the most efficient and violates DRY principles, but it works.