public static IQueryable<Course> QueryCoursesIncludeAll(this DbSet<Course> set)
        {
            var query = set.AsQueryable();

            query = query.Include(x => x.Exercises);
            query = query.Include(x => x.Exercises.Select(y => y.Packages));
            query = query.Include(x => x.Exercises.Select(y => y.Archive));
            query = query.Include(x => x.Exercises.Select(y => y.ProcessedExercises));
            query = query.Include(x => x.Exercises.Select(y => y.ProcessedExercises.Select(z => z.SubmittedResults)));
            query = query.Include(x => x.Packages);
            query = query.Include(x => x.Packages.Select(y => y.Exercises));
            query = query.Include(x => x.Packages.Select(y => y.Archive));
            query = query.Include(x => x.CourseArchives);
            query = query.Include(x => x.Contributors);
            query = query.Include(x => x.Owner);

            return query;
        }


  public static async Task<List<Course>> GetCoursesAsync(WebUser webUser)
        {
            using (var ctx = new DatabaseContext())
            {
                var query = ctx.Courses.QueryCoursesIncludeAll();

                if (webUser.Role != WebUserRole.Administrator)
                {
                    query = query.Where(x => x.Owner.Id == webUser.Id || x.Contributors.Any(y => y.Id == webUser.Id));
                }

                return await query.ToListAsync();
            }
        }