public ActionResult Create()
{
var instructor = new Instructor();
instructor.Courses = new List<Course>();
PopulateAssignedCourseData(instructor);
return View();
}
public void Update(Instructor student)
{
var existingInstructor = Database.Instructors.Find(x => x.Id == student.Id);
Database.Instructors.Remove(existingInstructor);
Database.Instructors.Add(student);
}
public void Create(Instructor student)
{
Database.Instructors.Add(student);
}
private void UpdateInstructorCourses(string[] selectedCourses, Instructor instructorToUpdate)
{
if (selectedCourses == null)
{
instructorToUpdate.Courses = new List<Course>();
return;
}
var selectedCoursesHS = new HashSet<string>(selectedCourses);
var instructorCourses = new HashSet<int>
(instructorToUpdate.Courses.Select(c => c.Id));
foreach (var course in _courseRepository.Get())
{
if (selectedCoursesHS.Contains(course.Id.ToString()))
{
if (!instructorCourses.Contains(course.Id))
{
instructorToUpdate.Courses.Add(course);
}
}
else
{
if (instructorCourses.Contains(course.Id))
{
instructorToUpdate.Courses.Remove(course);
}
}
}
}
private void PopulateAssignedCourseData(Instructor instructor)
{
var allCourses = _courseRepository.Get();
var instructorCourses = new HashSet<int>(instructor.Courses.Select(c => c.Id));
var viewModel = new List<AssignedCourseDataViewModel>();
foreach (var course in allCourses)
{
viewModel.Add(new AssignedCourseDataViewModel
{
CourseID = course.Id,
Title = course.Title,
Assigned = instructorCourses.Contains(course.Id)
});
}
ViewBag.Courses = viewModel;
}