public async Task <IActionResult> Details(int courseId)
        {
            Course           courseFromDB  = _coursesRepository.GetById(courseId);
            SubjectViewModel subjectFromDB = _subjectsRepository.GetById(courseFromDB.Subject.SubjectId);
            List <CourseModuleEditViewModel> modulesFromDB = await _coursesRepository.GetScheduleModules(courseId);

            List <Student> students = await _studentsRepository.GetStudentsByCourse(courseId);

            User userFromDB = await _usersRepository.GetByEmail(courseFromDB.Teacher.Email);

            CourseDetailsViewModel courseDetailsViewModel = new CourseDetailsViewModel()
            {
                Course  = courseFromDB,
                Subject = new Subject()
                {
                    SubjectId   = subjectFromDB.SubjectId,
                    Name        = subjectFromDB.Name,
                    Description = subjectFromDB.Description
                },
                Teacher = new AspNetUsers()
                {
                    FirstName  = userFromDB.FirstName,
                    LastName   = userFromDB.LastName,
                    MiddleName = userFromDB.MiddleName
                },
                Modules  = modulesFromDB,
                Students = students
            };

            return(View(courseDetailsViewModel));
        }