namespace Acme\Demo\Controller;

use TYPO3\Flow\Annotations as Flow;

/**
 * Ajax controller for the Acme.Demo package
 *
 * @Flow\Scope("singleton")
 */
class AjaxController extends \TYPO3\Flow\Mvc\Controller\ActionController {

    /**
     * @var array
     * @see http://git.typo3.org/FLOW3/Packages/TYPO3.FLOW3.git?a=commit;h=03b6d85916e46ed8b2e99bc549d7248957dca935
     */
    protected $supportedMediaTypes = array('text/html', 'application/json');

    /**
     * @var array
     */
    protected $viewFormatToObjectNameMap = array('json' => 'TYPO3\Flow\Mvc\View\JsonView');

    /**
     * @Flow\Inject
     * @var Acme\Demo\Domain\Repository\ScoutobjectRepository
     */
    protected $scoutobjectRepository;

    /**
     * autocomplete user input
     *
     * @return void
     */
    public function autocompleteAction() {
        $term = $this->request->getArgument('term');
        $objects = $this->scoutobjectRepository->findCityForAutocompletion($term);
        $objects2 = $this->scoutobjectRepository->findAll();
    }
}


*Repository*

namespace Acme\Demo\Domain\Repository;

/**
 * A repository for ScoutObjects
 *
 * @Flow\Scope("singleton")
 */
class ScoutobjectRepository extends \TYPO3\Flow\Persistence\Repository {

    // add customized methods here
    public function findCityForAutocompletion($term) {
        $query = $this->createQuery();
        $query->matching($query->like('gemeinde', $term.'%', FALSE));
        $results = $query->execute();

        $query2 = $this->createQuery();
        $query2->matching($query2->equals('gemeinde', 'Essen'));
        $results2 = $query2->execute();

        return $results;
    }
}