This example allows registered users to rate recipes when logged in. The user can only submit one rating, but can change it. The list of recipes is displayed on the Home page in a Repeater, which also displays the current rating for each recipe. Clicking a Repeater item opens a Lightbox displaying the recipe and allows the user to give or change a rating.
Go to the Ratings by User example page.
See more examples at Gramp's Workbench.