ajax validation unique on update - php

Question

I have ajax validation on unique on create it work fine but when I want to update i cant becouse this show message that this name is already used but i not owerwrite this name it is name from database on update click. Its does not matter whcich record i want to update it always show me message that name is already used. Whan can i do to disable message when i not change my input to name which is in base. Now it is so update action automatically filed my inputs but when i not change anythink i have this error on save
<?php $form = ActiveForm::begin(['options' => ['enctype' => 'multipart/form-data'], 'id'=>$model->formName(), 'enableAjaxValidation'=>true, 'validationUrl'=>Url::toRoute('category/validation')]) ?>
My controller:
public function actionValidation(){
$model= new SmCategory;
if(Yii::$app->request->isAjax && $model->load(Yii::$app->request->post()))
{
Yii::$app->response->format='json';
return ActiveForm::validate($model);
}
}
my rules:
public function rules()
{
return [
[['Name'], 'required'],
['Name', 'unique', 'targetClass' => 'common\models\Smcategory', 'message' => 'This name has already been taken.'],
[['Rel_Category', 'IsDeleted'], 'integer'],
[['File'],'file'],
[['Name', 'Label'], 'string', 'max' => 45],
[['Picture'], 'string', 'max' => 255]
];
}

Answer 1

The problem is here :
$model= new SmCategory;
This code is ok for create, not for update since it will not use the existing model for validation, it could be (just an example and assuming id is the primary key) :
public function actionValidation($id = null)
{
$model = $id===null ? new SmCategory : SmCategory::findOne($id);
if(Yii::$app->request->isAjax && $model->load(Yii::$app->request->post()))
{
Yii::$app->response->format='json';
return ActiveForm::validate($model);
}
}
And you could update validationUrl in your view :
$validationUrl = ['category/validation'];
if (!$model->isNewRecord)
$validationUrl['id'] = $model->id;
$form = ActiveForm::begin([
'options' => ['enctype' => 'multipart/form-data'],
'id' => $model->formName(),
'enableAjaxValidation' => true,
'validationUrl' => $validationUrl,
]);