Question

I’m dynamically building up a query starting with this:

var items = db.Items;

…

case "4":
items = items.OrderBy(x => x.Ratings.Average(t => t.score)).ThenBy(x => x.title);

The problem is that some items don’t have any data in the ratings table yet, so I believe it’s trying to average over data that doesn’t exist. Using DefaultOrEmpty() at the end doesn’t seem to have any effect. Any suggestions on how I would fix this?

Answer 1

   items = items.Where(x=>x.Ratings.Any()).
           OrderBy(x => x.Ratings.Average(t => t.score)).
           ThenBy(x => x.title);

Try that.