Question

In RavenDB, I have a document that looks like this:

public class SystemNotification {
    public string Body {get;set;}
    public List<Guid> ReadBy {get;set;}
}

How can I create an index to efficiently query for the count of unread notifications for a user ? Or is there a better way to model this scenario ?

Answer 1

var count = session.Query<SystemNotification>()
    .Where(x => !x.ReadBy.Any(y => y == yourGuid))
    .Count();

Whether there is a better way to model this depends on how many users you will have in your system and a few other things.

As a side note: Don’t use Guids for your ids. They are hard to read and have no particular advantage over hilo keys.