Queries are pre-build for things like "get all authors and the books of the author in the URL" or similar (more). These are configured in the App administration. The query AuthorsWithBooks
(shown to the right) is used in this example. Below you'll see us first iterate through all the items in the Authors
Stream. If an author was clicked on (which places the author-id in the url), the query will also return the current Author in the Current
stream as well as the CurrentBooks
of that author.