Google App Maker: How to add pagination and sorting to a table widget bound to a calculated datasource?

Question

I have "Calculated" model called "Groups" in which I have added the following server script to load the google groups that are part of my domain and display them in a table widget when the user lands on the page. The data displays fine on the first page, but when I click to see the next page, I see the same subset of records and clicking the headers to sort the table does not work either. I'd appreciate some guidance here.

Calculated Model Server script:

 var groupList = []; var pageToken; var page; do { page = AdminDirectory.Groups.list({ customer: 'my_customer', maxResults: 5, pageToken: pageToken }); var groups = page.groups; if (groups) { for (var i = 0; i < groups.length; i++) { var group = groups[i]; var record = app.models.Groups.newRecord(); record.id = group.id; record.name = group.name; record.email = group.email; record.directMembersCount = group.directMembersCount; groupList.push(record); } } else { console.log('No groups found.'); } pageToken = page.nextPageToken; } while (pageToken); return groupList; 

I've configured the model the following way: