Entity Framework subquery

Question

Guys I am new to Entity Framework and I\'m having a bt of a problem that I have been trying to solve for quite a while. Basically I have 4 entities: users, groups, books an

Answer 1

I haven't tested it but hopefully it will work.

entities.Books.Where(
b => entities.ReadingList.
Where(rl => rl.GroupId == groupId).
Select(rl => rl.BookId).
Contains(b.BookId)
)