How to make table loading (multi loading) in Yii2?

Question

Yii

I am using the latest demos.krajee.com/builder-details/tabular-form module
.

<div class="panel-body">
                    <?php
                    $form = kartik\form\ActiveForm::begin(
                        [  'id'=>  $model->formName(),
                          
                        ]
                            );
                    echo TabularForm::widget([
                        // your data provider
                        'dataProvider' => $dataCertificate,
                        'form' => $form,
                        'staticOnly' => true,
                        'actionColumn' => false,
                        'attributes' => [
                           
                            'certificate_code' => ['label' => 'certificate_code', 'type' => TabularForm::INPUT_HIDDEN_STATIC]
                        ], 
                
                    ]);
                    ?>

I don’t understand how to validate and save the models.

public function actionIndex() {

        $model = new PackagesForm();
        $certificates = Certificate::find()->where(['certificates.user_id' => Yii::$app->user->identity->id]);
        $packages = Packages::find();



        $dataProvider = new ActiveDataProvider([
            'query' => $packages,
            'sort' => [
                'defaultOrder' => ['id' => SORT_DESC],
            ],
        ]);

        $dataCertificate = new ActiveDataProvider([
            'query' => $certificates,
            'sort' => [
                'defaultOrder' => ['id' => SORT_DESC],
            ],
        ]);



        if (\yii\base\Model::loadMultiple($model, Yii::$app->request->post(), $formName = $model->formName()) && Model::validateMultiple($model)) {
            $count = 0;
            foreach ($models as $index => $model) {
// populate and save records for each model
                if ($model->save()) {
                    $count++;
                }
            }

            return $this->render('index', [
                        'model' => $model,
                        'certificates' => $certificates,
                        'dataProvider' => $dataProvider,
                        'dataCertificate' => $dataCertificate,
            ]);
        } else {

            var_dump(\yii\base\Model::loadMultiple($model, Yii::$app->request->post(), $formName = $model->formName()));
            die();
            return $this->render('index', [
                        'model' => $model,
                        'certificates' => $certificates,
                        'dataProvider' => $dataProvider,
                        'dataCertificate' => $dataCertificate,
            ]);
        }
    }

\yii\base\Model::loadMultiple($model, Yii::$app->request->post(), $formName = $model->formName()) - Fails