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Data Model Questions

DataObject::get and child classes


2 Posts   745 Views


30 September 2011 at 12:23pm Community Member, 56 Posts

I am planning on developing a few child classes from a parent one. I noticed in SiteTree if I do a DataObject::get search for a page class, it will also return all child classes.

How does Silverstripe track ID's on child classes? Are all child class objects tracked in the parent table, too (by ID), or would I need to be careful e.g. a ChildClass starts from 1 and and a ChildClass with ID=1 may not be the same object as ParentClass ID=1?

Hope this makes sense.


30 September 2011 at 10:53pm Forum Moderator, 5511 Posts

Subclasses keep the exact same ID as parent classes. So if you get a ID on SubsubPage it'll be the same ID as SubPage, Page, SiteTree.