How to include file and pass model to Yii2?

Question

Yii

Hello everyone, I've run into this problem. Making a callback function
I have a model (Callback), a controller (CallbackController) and a view (frontend/view/callback/index.php).
Controller:

spoiler

public function actionIndex()
    {
        $model = new Callback();

        if ($this->request->isPost) {
            if ($model->load($this->request->post()) && $model->save()) {
                Yii::$app->session->setFlash('success', 'Сообщение успешно отправлено!');
                return $this->redirect(Yii::$app->request->referrer);
            }
        }
        return $this->render('index', compact('model'));
    }

I'm trying to output (connect) this callback/inde.php to the layout footer

<?php echo $this->renderA('@frontend/views/callback/index.php'); ?>

callback/index.php

spoiler

<?php \yii\widgets\Pjax::begin(); ?>
<?php $form = \yii\bootstrap\ActiveForm::begin(['id' => 'callback-form-index', 'action' => ['callback/index'],]); ?>
                <div class="modal-body">
                    <?= $form->field($model, 'name')->textInput(['maxlength' => true, 'placeholder' => 'Ваше имя']) ?>
                    <?= $form->field($model, 'phone')->textInput() ?>
                    <?= $form->field($model, 'reCaptcha')->widget(
                        \himiklab\yii2\recaptcha\ReCaptcha2::class,
                        [
                            'siteKey' => 'мой ключ, // unnecessary is reCaptcha component was set up
                        ]
                    ) ?>
                </div>
                <div class="modal-footer">
                    <?= \yii\helpers\Html::submitButton('Заказать обратный звонок', ['class' => 'callback_btn', 'name' => 'callback-button', 'id' => 'refreshButton1', 'onclick' => "yaCounter51997982.reachGoal('buttonCallback'); return true;"]) ?>
                </div>
                <?php \yii\bootstrap\ActiveForm::end(); ?>
<?php \yii\widgets\Pjax::end(); ?>

But I'm getting an error:

Call to a member function isAttributeRequired() on null

Swears on fields which the user should fill.
Please tell me how this can be overcome.

Answer 1

<?php echo $this->renderPartial('@frontend/views/callback/index.php',["model" =>new Callback()]); ?>

try passing the model in the place where you render, only you will need to specify the full namespace before the model. Your controller renders a specific page, and it does not know that you are inserting a template into the footer. After submitting the form, you will get into it, but for rendering, the object must be passed separately