Image Upload Duplicate Sql Entry!

	public function actionCreate()
	{
		$model=new Article;

		if(isset($_POST['Article']))
		{

			$model->attributes=$_POST['Article'];
			$main_image=CUploadedFile::getInstance($model,'main_image');
			if(is_object($main_image)){
					$MainFileName= uniqid(time(), false);	
					$FileExt = $main_image->getExtensionName();
					$model->main_image = $MainFileName.$FileExt;
			}
			if($model->save()){
				 if(is_object($main_image)){
				 	$main_image->saveAs(Yii::app()->basePath.'../../images/'.$MainFileName.".".$FileExt);
				 }
					$this->redirect(array('view','id'=>$model->id));
			}			

		 }

		$this->render('create',array(
			'model'=>$model,
		));
	}