`Skip on empty` not working in Yii2 file upload - yii

Question

I have a provision to upload logo for companies in my application. Uploading and saving on creating profile works fine. But on update, logo goes empty if I am not uploading it again!
Here's my update form
<?php $form = ActiveForm::begin([
'options' => ['enctype'=>'multipart/form-data']
]); ?>
.....
<?= $form->field($model, 'logo')->fileInput() ?>
...
My Controller action
if ($model->load($_POST) ) {
$file = \yii\web\UploadedFile::getInstance($model, 'logo');
if($file){
$model->logo=$file; }
if($model->save()){
if($file)
$file->saveAs(\Yii::$app->basePath . '/web/images/'.$file);
}
return $this->redirect(['profile']);
} else {
return $this->renderPartial('update', [
'model' => $model,
]);
}
My Rules:
public function rules()
{
return [
[['logo'], 'image', 'extensions' => 'jpg,png', 'skipOnEmpty' => true],
[['name'], 'required'],
[['name', 'description'], 'string'],
];
}
Any ideas????

Answer 1

skipOnEmpty does not apply here because in the update action the $model->logo attribute will not be empty, it will be a string with the file name.$file is still an array with only keys, but not values if not uploaded again. So checked the $file->size instead of checking !empty($file). Fixed the issue by modifying the controller code as follows!
$model = $this->findModel($id);
$current_image = $model->featured_image;
if ($model->load(Yii::$app->request->post())) {
$image= UploadedFile::getInstance($model, 'featured_image');
if(!empty($image) && $image->size !== 0) {
//print_R($image);die;
$image->saveAs('uploads/' . $image->baseName . '.' .$image->extension);
$model->featured_image = 'uploads/'.$image->baseName.'.'.$image->extension;
}
else
$model->featured_image = $current_image;
$model->save();
return $this->redirect(['update', 'id' => $model->module_id]);
} else {
return $this->render('add', [
'model' => $model,
]);
}

Answer 2

'skipOnEmpty' => !$this->isNewRecord
For update it can be skipped.