/**
  * This returns the table prefix for the current model state.
  *
  * @global wpdb     $wpdb
  * @return string
  */
 public function get_table_prefix()
 {
     global $wpdb;
     if ($this->_global) {
         $prefix = $wpdb->base_prefix;
     } else {
         $prefix = $wpdb->get_blog_prefix(EEM_Base::get_model_query_blog_id());
     }
     return $prefix;
 }