How to move code from controller to model?

Question

Yii

Hello. There is a controller in Yii2:

public function actionUpdate($id)
{
  $model 	= $this->findModel($id);
  $image 	= $model->image;	

  if ($model->load(Yii::$app->request->post())) {
    $model->files 			= UploadedFile::getInstance($model, 'image');
      
    if ($model->validate()) {
    
      if ($model->files) {
        $name 			= $model->files->baseName . '.' . $model->files->extension;
        $path			= Yii::getAlias('@webroot' . '/uploads/') . $name;
        $model->files->saveAs($path);
        $model->image 	= $name;
          
        if($model->removeImage) {
          $fileRemove 	= Yii::getAlias('@webroot' . '/uploads/') . $image;
          if(file_exists($fileRemove)) {
            unlink($fileRemove);
            $model->image 	= '';
          }
        }
      }

      $model->save();
      return $this->redirect(['view', 'id' => $model->id]);		
    }
    
    
  } 
  
  else {
    return $this->render('update', [
      'model' 			=> $model,
    ]);
  }

}

Defined properties in the model:

public $files;
public $removeImage;

There are also rules, etc.
Everything works, but all my controllers are thick. I want to move the code to the model to make thin controllers. What parts of the code can be moved there and how to call it in the controller?
Whether it is necessary to transfer there from the controller such? :

Article::findOne($id)
Article::find()->where(['id' => $id])->all();

Answer 1

public function actionUpdate($id)
{
    $model = $this->findModel($id);
    if ($model->load(Yii::$app->request->post()) && $model->validate()) {
        $model->save();
        return $this->redirect(['view', 'id' => $model->id]);
    } else {
        return $this->render('update', ['model' => $model]);
    }
}

leave this, everything else in the model in beforeSave()

Answer 2

We threw external data into the model, took data from it and passed it to the view. This will all take 4-5 lines.