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Data Model Questions /

Moderators: martimiz, Sean, Ed, biapar, Willr, Ingo, swaiba

Possible to convert a Page to DataObject?

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4 Posts   1896 Views


Community Member, 181 Posts

22 June 2010 at 11:18am

Was really hoping there'd be a simple way to exploit existing functionality to do this seeing as Page is a type of DataObject anyway...

There are a couple of hundred pages (a sub-class of page) I want to convert "in place" to a new sub-class of DataObject to be managed with DataObjectManager ideally or ModelAdmin if not. Essentially removing them from the site tree but still accessible via URLSegment also.

Anyone know of a "trick" to do this or will I have to export and import them into a new DataObject?




Forum Moderator, 5523 Posts

22 June 2010 at 7:29pm

You could write a simple script in the php (as a subclass of migrationtask) and do something like

$pages = DataObject::get('BlogEntry'); // get all blog entries

foreach($pages as $page) {
$do = new SomeDataObject();
$do->Title = $page->Title;
$do->Content = $page->Content;
// what ever other fields

$do->write(); // save the dataobject.



Community Member, 712 Posts

22 June 2010 at 9:33pm

Edited: 22/06/2010 9:35pm

There's an API method to do this:

DataObject newClassInstance( string $newClassName)

Create a new instance of a different class from this object's record.

This is useful when dynamically changing the type of an instance. Specifically, it ensures that the instance of the class is a match for the className of the record. Don't set the DataObject->class or DataObject->ClassName property manually before calling this method, as it will confuse change detection.

If the new class is different to the original class, defaults are populated again because this will only occur automatically on instantiation of a DataObject if there is no record, or the record has no ID. In this case, we do have an ID but we still need to repopulate the defaults.

return The new instance of the new class, The exact type will be of the class name provided.
string $newClassName - The name of the new class


$page = DataObject::get_one('Page'); // a single Page
$newObject = $page->newClassInstance('DataObject');


Community Member, 181 Posts

23 June 2010 at 9:24am

Thanks Willr & Hamish,

There was I thinking I'd have to do something "hacky" when there are two methods to do it right there! Sweet.

Might look at a combination of both methods but definitely something I'll be using.