protected function addAddInstanceToPool(&$script)
    {
        $table = $this->getTable();
        $script .= "
    /**
     * Adds an object to the instance pool.
     *
     * Propel keeps cached copies of objects in an instance pool when they are retrieved
     * from the database.  In some cases -- especially when you override doSelect*()
     * methods in your stub classes -- you may need to explicitly add objects
     * to the cache in order to ensure that the same objects are always returned by doSelect*()
     * and retrieveByPK*() calls.
     *
     * @param " . $this->getObjectClassname() . " \$obj A " . $this->getObjectClassname() . " object.
     * @param      string \$key (optional) key to use for instance map (for performance boost if key was already calculated externally).
     */
    public static function addInstanceToPool(\$obj, \$key = null)
    {
        if (Propel::isInstancePoolingEnabled()) {
            if (\$key === null) {";

        $pks = $this->getTable()->getPrimaryKey();

        $php = array();
        foreach ($pks as $pk) {
            if ($pk->isTemporalType()) {
                $php[] = '$obj->get' . $pk->getPhpName() . "('U')";
            } else {
                $php[] = '$obj->get' . $pk->getPhpName() . '()';
            }
        }
        $script .= "
                \$key = " . $this->getInstancePoolKeySnippet($php) . ";";
        $script .= "
            } // if key === null
            " . $this->getPeerClassname() . "::\$instances[\$key] = \$obj;
        }
    }
";
    }