Sep 02, 2016 01:41 AM|Wenushka|LINK
Here the Gig and Notification are the related data of the selected entity / entities.
You need to load / include them explicitly as follows,
var notifications = _context.UserNotifications
.Include(un => un.Notification)
.Include(un => un.Gig.Select(g => g.Artist)
.Where(un => un.UserId == userId)
Thanks & Regards,