I'm having issues getting the dot-notation working for a has_one of a Page.

class Testimonial extends DataObject {
	
	public static $db = array(
		'Title' => 'Varchar(255)',
		'Quote' => 'HTMLText',
		'Tagline' => 'Varchar(255)',
		'SortOrder' => 'Varchar(255)'
	);
	
	public static $has_one = array(
		'BookPage' => 'BookPage',
		'Image' => 'Image'
	);
	
	public static $summary_fields = array(
		'BookPage.Name',
		'Title',
		'Quote',
		'Tagline'
	);

And the BookPage is a class that extends 'Page'

The BookPage.Name doesn't work in my SS3 setup. To be clear, I'm trying to view the BookPage Column so I know which page ("Book") has the testimonial.

I jumped off the github version and grabbed Silverstripe's stable download to get things working for my summary fields. It looks like I'll be staying with stable releases from now on.