public StudentEnrollmentsViewModel(IAuthService authService, IUsersService usersService, IModulesService modulesService, ICoursesService coursesService)
{
_authService = authService;
_usersService = usersService;
_modulesService = modulesService;
_coursesService = coursesService;
selectedUser = _authService.authorisedUser;
allModuleRuns = _modulesService.GetAllModuleRuns().Result.Select(x => x.ToIdentifier()).ToList();
allCourses = _coursesService.GetAllCourses().Result.Select(x => x.ToIdentifier()).ToList();
}