Yii2: $model->load() returns false

Question

I have a form where user can load the image. In my controller I have an action called actionUpdate which contains code like this.
Controller

public function actionUpdate()
{
    $id = Yii::$app->user->id;
    $model = Page::find()->where(['user_id'=>$id])->one();
    if ($model->load(Yii::$app->request->post()))
    {
        $image = UploadedFile::getInstance($model, 'thumbnail');
        $model->thumbnail = $model->url.".".$image->extension;

        if ($model->validate() && $model->save())
        {
            $model->upload();
            //page/url is for the user's page
            return $this->redirect('page/'.$model->url);
        } 
    } 
    else 
    {
        //'update' is a view file with form
        return $this->render('update', [
            'model' => $model,
        ]);
    }
}

When I'm submitting the form, I'm being redirected to the same update action url but with blank screen, instead of redirecting to the user's page. Maybe the problem is in my Model's upload function?
Model

public function upload()
{
    if ($this->validate()) {
        $user = Page::find()->where(["user_id" => Yii::$app->user->id])->one();
        $this->thumbnail->saveAs('avatars/'.$user->url.'.'.$this->thumbnail->extension);
        return true;
    } else {
        return false;
    }
}

Answer 1

could be, also, that your validation or save don't return true

    if ($model->validate() && $model->save())
    {
        $model->upload();
        //page/url is for the user's page
        return $this->redirect('page/'.$model->url);
    }  else {

        var_dump('not  validated or not saved ')
    }

Answer 2

Please have exception handling (try, catch) in your Model. Never write Model without exception handling.

configure yii_logger db in your machine (you can find it Yii2 docs).

then run

SELECT FROM_UNIXTIME(log_time, '%Y-%m-%d') log_date, y.*  FROM yii_logger y where level = 1 order by log_time desc limit 20;

you may see error backtrace if your code is breaking somewhere.

Answer 3

Update code in your actionUpdate

$model->upload($image);

and in your model upload function

public function upload($image)
{
    if ($this->validate()) {
        $user = Page::find()->where(["user_id" => Yii::$app->user->id])->one();
        // updated with parameter here
        $image->saveAs('avatars/'.$user->url.'.'.$image->extension);
        return true;
    } else {
        return false;
    }
}

Please update this in your code and check it.