Remove

[Mery]

Hi, I have a problem with the application to see if someone can help me.

In my application I have something similar to this:

public class garage extends AbstractDomainObject {
…
private List<Cars> cars = new ArrayList<Cars>();
}

And inside the class Cars I have another arraylist like this:

public class Cars extends AbstractDomainObject {
…
private List<Color> colors = new ArrayList<Color>();

When I remove a item of Cars class that it has some items associated of Colors class, then I have a error when I want read this items of Colors class. I need that this items also removed when I called to this method for remove item of Cars class:

public void removeFromCars (Cars item){
    cars.remove(item);
    }

How can I do?

[Alexander Krasnukhin]

You want to autoremove all Color objects with Cars object, don't you?

[Mery]

Yes, it is. ¿How can I do that?

[Alexander Krasnukhin]

You can use removing() method. It will be invoked before object is really removed from object store. So you could clear colors collection & remove all Color objects before Cars object is removed. Please, read more there http://www.nakedobjects.org/applib/recognised-methods.html

[Mery]

I tried with this, but didnt work:

    public void clearCars(){
   
    cars.clear();
    };

    public void removing(Cars item){
   
    cars.remove(item);
    clearCars ();
    }

Which can be the problem?