use ContaoCommunityAlliance\DcGeneral\Event\PrePersistModelEvent;

// with priority -1
return array(
    PrePersistModelEvent::NAME => array(
        array(
            function (PrePersistModelEvent $event) {

                if ($event->getEnvironment()->getDataDefinition()->getName() != 'mm_objects') {
                    return;
                }

                $objModel = $event->getModel();
                return;
                // check if empty
                if ($objModel->getProperty('geo_lat') || $objModel->getProperty('geo_lng')) {
                    return;
                }

                // https://developers.google.com/maps/documentation/geocoding/intro?hl=de
                // Strasse+Nr, ZIP City, Land
                $strAddress = sprintf('%s, %s %s, %s',
                                     $objModel->getProperty('street'),
                                     $objModel->getProperty('post_code'),
                                     $objModel->getProperty('city'),
                                     $objModel->getProperty('country')
                                     );
                //echo "Addres: ";print_r($strAddress);die();
                // Address, Country, Lang
                $unklar = \delahaye\GeoCode::getCoordinates($strAddress, '', '');
                //echo "unklar: ";print_r($unklar);die();

                $objModel->setProperty('geo_lat',$floatTotalRent);
                $objModel->setProperty('geo_lng',$floatTotalRent);

            },
            -1
        )
    )
);