Module.php

public function getServiceConfig()
    {
        return array(
            'factories' => array(
                'Application\Model\Item' => function($sm) {
                    return new Item();
                },
                'ItemTableGateway' =>  function($sm) {
                    $dbAdapter = $sm->get('Zend\Db\Adapter\Adapter');
                    $resultSetPrototype = new ResultSet();
                    $resultSetPrototype->setArrayObjectPrototype($sm->get('Application\Model\Item'));
                    $tableGateway = new TableGateway('item', $dbAdapter, null, $resultSetPrototype);
                    $table = new ItemTable($tableGateway);
                    return $table;
                },
            ),
        );
    }