Magento unique TaxVat atrribute for every customer

Question

.Hi,
I'm trying to make the attribute taxvat unique for every customer. (especially for users that i create from the backend). i.e no duplicates.
Just like the email attribute, if the email is already used, user gets notified to use another email.
I tried from the eav_attribute to change "is_unique" to "1" but nothing happened..
Can you please help me how to achieve this..?
Thanks

Answer 1

ok, i found the solution.. Find file /app/code/core/Mage/Customer/Model/Form.php (Don't forget to override instead..) in "public function validateData(array $data)"

add the code inside the foreach ($this->getAttributes() as $attribute)

foreach ($this->getAttributes() as $attribute) {
...
...
//## code to add
        if ($attribute->getIsUnique()) {
            $cid = $this->getEntity()->getData('entity_id'); //get current customer id
            $cli = Mage::getModel('customer/customer')
            ->getCollection()
            ->addAttributeToFilter($attribute->getAttributeCode(), $data[$attribute->getAttributeCode()]);
            //->addFieldToFilter('customer_id',   array('neq' => $cid)); //exclude current user from results  //###### not working......
            $flag=0;
            foreach ($cli as $customer) {
                 $dataid=$customer->getId();
                 if ($dataid != $cid) //if the value is from another customer_id
                    $flag |= 1;  //we found a dup value
            }

            if ($flag) {
                $label = $attribute->getStoreLabel();
                $errors = array_merge($errors, Mage::helper('customer')->__('"%s" already used!',$label));
            }
        }
//## End of code to add
}