Scenarios validation In Yii 1.0

Scenarios validation is the one of the useful future in yii framwork and seperating the validation on any class derived from CModel. For example When we register a user, we will do some validation. For the registered user update, we will use different type validation. In this type of case we will use scenario.
  1. Syntax
  2. CActiveRecord Scenarios
  3. Scenario With Password Validation
  4. Validation Scenario In Controller

Syntax


//rule for single scenario
'on'=>'scenarioName'
//rule for multiple scenarios
'on'=>'scenarioName_1, scenarioName_2, scenarioName_3'
Secnarios validation is used to restrict the data When we apply this.

CActiveRecord Scenarios

By default CActiveRcord having three scenarios. Thet are insert, update and search. When we create a new record in database table, the 'insert' scenario will automatically work. When we update a record, the model will take 'update' scenario. Scenatio is a very useful way to validate the model in different types of method.

Scenario With Default Validation


public function rules() {
	..............
	array('createdon', 'default',
		'value'=>new CDbExpression('NOW()'), 'on'=>'insert'),
	array('updatedon', 'default',
		'value'=>new CDbExpression('NOW()'), 'on'=>'update'),
	array('id, username, email', 'safe', 'on' => 'search'),
	..............
}

Scenario With Required


public function rules() {
	..............
	array('username, email', 'required','on'=>'register'), 
	..............
}

Scenario With Password Validation

Password scenario will helpful to understand the use of scenario in model. I given sample user model. Normally when we register a user model, we will give the username, password, firstname etc and also we will change the password simultensiouly. For this i added the scenario validation below

User Model


class ClassName extends CActiveRecord {
	..............
	public function rules() {
		..............
		array('password', 'compare', 'compareAttribute' =>'confirmpassword',
			'on'=>'register,changepassword'),
		array('username, email', 'unique','on'=>'register, update'), 			
		..............
	}
	..............
}

Validation Scenario In Controller

I added the different type format for same scenario validation in controller action. 

<?php
	...............
	public function actionRegister(){
		$model=new User;
		$model->scenario='register';
		// OR
		//$model=new User('register');
		// OR
		//$model=new User();
		//$model->validate('register');
	}
	
	public function actionChangepassword($id){
		$model=new User;
		$model->scenario='changepassword';
		// OR
		//$model=new User('changepassword');
		//$model=new User();
		//$model->validate('changepassword');
	}
?>