......... mbatik lagi dengan php......

I want to create an inherited model (class) from another model, as illustrated in Yii's wiki entry: Single Table Inheritance.

The tutorial uses defaultScope() in differentiating the Car model into SportCar, FamilyCar by applying conditions or filters on the Car's attribute 'type'. This, however, doesn't work when one wants to create new SportCar —the child— object. I would have to call setAttribute('type','sport') whenever the SportCar model is to be passed into create forms. defaultScope() is only useful for search/find operation (used as default parameter in a CDbCriteria instance, for example), as stated in Yii Class Reference:

[...] Note, default scope only applies to SELECT queries. It is ignored for INSERT, UPDATE and DELETE queries.

The workaround I use is to override the init() method in the inherited model/class. The CActiveRecord Class Reference says:

[...] This method is invoked when an AR instance is newly created and has its scenario set. You may override this method to provide code that is needed to initialize the model (e.g. setting initial property values.).

class SportCar extends Car
{
   //... 
   /**
    * override the init() function to initialize variables
    */
    function init(){
        parent::init();

        // initialize the 'type' attribute
        $this->__set('type','Sport');
    }
    ...
} 

This works fine so far. Using CActiveForm, the SportCar and FamilyCar models would return the intended types —'sport' or 'family'— in create/update form fields.