I like having a base model for my models. I also couldn't find a method to generate an error list as a string or dom so I placed them in here, it's quite nice to use. If anyone has done anything else with models that are handy to you post them!

<?php

class BaseModel extends \Phalcon\Mvc\Model
{
    use Timestamp;

    // --------------------------------------------------------------

    /**
     * Returns a list of errors
     *
     * @return boolean|string
     */
    public function getMessagesString()
    {
        if ($this->getMessages()) {
            return implode(', ', $this->getMessages());
        }
        return false;
    }

    // --------------------------------------------------------------

    /**
     * Returns a HTML formatted list of errors
     *
     * @return boolean|string
     */
    public function getMessagesList()
    {
        if (!$this->getMessages()) {
            return false;
        }

        $output = '<ul>';
        foreach ($this->getMessages() as $message) {
            $output .= sprintf('<li>%s</li>', $message);
        }
        $output .= '</ul>';
        return $output;
    }

    // --------------------------------------------------------------

}

trait TimeStamp
{

    // --------------------------------------------------------------

    public function beforeCreate()
    {
        $this->created_at = date('Y-m-d H:i:s');
    }

    // --------------------------------------------------------------

    public function beforeUpdate()
    {
        $this->updated_at = date('Y-m-d H:i:s');
    }

    // --------------------------------------------------------------

}

// End of File
// --------------------------------------------------------------