public static function save($post_id, $post)
 {
     if (isset($_POST['assign_to'])) {
         rtbiz_update_entity_meta($post_id, 'assgin_to', $_POST['assign_to']);
     } else {
         rtbiz_update_entity_meta($post_id, 'assgin_to', '');
     }
 }
 /**
  * create contact
  *
  * @param        $name
  * @param string $description
  * @param string $email
  *
  * @return int|WP_Error
  */
 function add_contact($name, $description = '', $email = '')
 {
     $contact_id = wp_insert_post(array('post_title' => $name, 'post_excerpt' => $description, 'post_type' => $this->post_type, 'post_status' => 'publish'));
     if (!empty($email)) {
         rtbiz_update_entity_meta($contact_id, self::$primary_email_key, $email);
     }
     return $contact_id;
 }