public static void TryUpdateManyToMany <T, TKey>(this QSpaceDbContext db, IEnumerable <T> currentItems, IEnumerable <T> newItems, Func <T, TKey> getKey) where T : class
{
db.Set <T>().RemoveRange(currentItems.Except(newItems, getKey));
db.Set <T>().AddRange(newItems.Except(currentItems, getKey));
}
