Workaround to get Ardent's rule "unique" not fail when updating existing records.

Arendt.php

<?php 

namespace Mauro\Ardent;

class Ardent extends \LaravelBook\Ardent\Ardent {

   public function validate( array $rules = array(), array $customMessages = array() ) {

      if (empty($rules)) {

         $rules = static::$rules;

         if ( $this->exists ) {
            foreach ($rules as $field => $rule) {
               $rules[$field] = str_replace('{id}', isset($this) ? "{$this->id}" : '', $rule);
            }
         }

      }

      return parent::validate( $rules, $customMessages ) ;
   }

}