VitGun

<?= $form->field($model, 'title')->dropDownList(\yii\helpers\ArrayHelper::map(\app\models\Organizat::find()->all(), 'id', 'name',['class'=>'col-md-2'])) ?>

$data = $_POST["data"];
    $conn = new MongoClient();
    $db = $conn->ETM;
    $collection = $db->ETM;    
    $cursor = $collection->find(['DEALDATE'=>$data]);