Controller (example)

<?php

namespace app\controllers;

use app\components\AccountFilter;
use Yii;
use app\models\Contactperson;
use yii\data\ActiveDataProvider;
use yii\filters\AccessControl;
use yii\web\Controller;
use yii\web\NotFoundHttpException;
use yii\filters\VerbFilter;
use yii\web\UploadedFile;

/**
 * AccountContactpersonController implements the CRUD actions for Contactperson model.
 */
class AccountContactpersonController extends Controller
{
    /**
     * {@inheritdoc}
     */
    public function behaviors()
    {
        return [
            'access' => [
                'class' => AccessControl::class,
                'rules' => [
                    [
                        'allow' => true,
                        'roles' => ['admin', 'manager'],
                    ],
                ],
                'denyCallback' => function($rule, $action){
                    return $this->redirect('login');
                }
            ],
            'verbs' => [
                'class' => VerbFilter::class,
                'actions' => [
                    'delete' => ['POST'],
                ],
            ],
            'account' => [
                'class' => AccountFilter::class
            ],
        ];
    }



    /**
     * Creates a new Contactperson model.
     * If creation is successful, the browser will be redirected to the 'view' page.
     * @return mixed
     */
    public function actionCreate()
    {
        $model = new Contactperson();
        $model->account_id = Yii::$app->account->data->id;

        if( $model->load(Yii::$app->request->post()) ){
            $model->scenario = Contactperson::SCENARIO_SAVE;
            //which button?
            //upload submit button
            if( Yii::$app->request->post("upload") === "true" ){
                //upload image only
                $model->scenario = Contactperson::SCENARIO_UPLOAD_ONLY;
                $model->image = UploadedFile::getInstance($model, 'image');
                $model->upload();
                //save submit button triggert, as only btn left
            }else{
                //image already uploaded OR has changed after upload?
                if( !$model->uploaded ){ //OR isset($model->image) ){
                    $model->image = UploadedFile::getInstance($model, 'image');
                    $model->upload();
                }
                if( $model->save() ) {
                    return $this->redirect('/contactperson/' . $model->id);
                }
            }
        }
        Yii::debug($model);

        return $this->render('create', [
            'model' => $model,
        ]);
    }



    /**
     * Updates an existing Contactperson model.
     * If update is successful, the browser will be redirected to the 'view' page.
     * @param integer $id
     * @return mixed
     * @throws NotFoundHttpException if the model cannot be found
     */
    public function actionUpdate($id)
    {
        $model = $this->findModel($id);

        if ($model->load(Yii::$app->request->post()) && $model->save()) {
            return $this->redirect('/contactperson/' . $model->id);
        }

        return $this->render('update', [
            'model' => $model,
        ]);
    }







    /**
     * Lists all Contactperson models.
     * @return mixed
     */
    public function actionIndex(){
        $dataProvider = new ActiveDataProvider([
            'query' => Contactperson::find(),
        ]);

        return $this->render('index', [
            'dataProvider' => $dataProvider,
        ]);
    }

    /**
     * Displays a single Contactperson model.
     * @param integer $id
     * @return mixed
     * @throws NotFoundHttpException if the model cannot be found
     */
    public function actionView($id){
        return $this->render('view', [
            'model' => $this->findModel($id),
        ]);
    }

    /**
     * Deletes an existing Contactperson model.
     * If deletion is successful, the browser will be redirected to the 'index' page.
     * @param integer $id
     * @return mixed
     * @throws NotFoundHttpException if the model cannot be found
     */
    public function actionDelete($id){
        $this->findModel($id)->delete();

        return $this->redirect(['index']);
    }

    /**
     * Finds the Contactperson model based on its primary key value.
     * If the model is not found, a 404 HTTP exception will be thrown.
     * @param integer $id
     * @return Contactperson the loaded model
     * @throws NotFoundHttpException if the model cannot be found
     */
    protected function findModel($id){
        if (($model = Contactperson::findOne($id)) !== null) {
            return $model;
        }

        throw new NotFoundHttpException('The requested page does not exist.');
    }
}