private void UpdateClassroomInstructors(string[] selectedInstructors, VirtualClassroom classroomToUpdate)
{
if (selectedInstructors == null)
{
classroomToUpdate.Instructors = new List <Instructor>();
return;
}
var selectedInstructorsHs = new HashSet <string>(selectedInstructors);
var classroomInstructors = new HashSet <int>
(classroomToUpdate.Instructors.Select(i => i.InstructorId));
foreach (var instructor in _context.Instructors)
{
if (selectedInstructorsHs.Contains(instructor.InstructorId.ToString()))
{
if (!classroomInstructors.Contains(instructor.InstructorId))
{
classroomToUpdate.Instructors.Add(instructor);
}
}
else
{
if (classroomInstructors.Contains(instructor.InstructorId))
{
classroomToUpdate.Instructors.Remove(instructor);
}
}
}
}
private void UpdateClassroomStudents(string[] selectedStudents, VirtualClassroom classroomToUpdate)
{
if (selectedStudents == null)
{
classroomToUpdate.Students = new List <Student>();
return;
}
var selectedStudentsHs = new HashSet <string>(selectedStudents);
var classroomStudents = new HashSet <int>
(classroomToUpdate.Students.Select(i => i.StudentId));
foreach (var student in _context.Students)
{
if (selectedStudentsHs.Contains(student.StudentId.ToString()))
{
if (!classroomStudents.Contains(student.StudentId))
{
classroomToUpdate.Students.Add(student);
}
}
else
{
if (classroomStudents.Contains(student.StudentId))
{
classroomToUpdate.Students.Remove(student);
}
}
}
}
public ActionResult Edit(int?id)
{
if (id == null)
{
return(new HttpStatusCodeResult(HttpStatusCode.BadRequest));
}
VirtualClassroom virtualInstructor =
_context.VirtualClassrooms
.Include(s => s.Instructors)
.Single(v => v.Id == id);
VirtualClassroom virtualStudent =
_context.VirtualClassrooms
.Include(s => s.Students)
.Single(v => v.Id == id);
PopulateAssignedInstructorData(virtualInstructor);
PopulateAssignedStudentData(virtualStudent);
VirtualClassroom virtualClassroom = _context.VirtualClassrooms.Find(id);
if (virtualClassroom == null)
{
return(HttpNotFound());
}
ViewBag.CourseId = new SelectList(_context.Courses, "Id", "Name", virtualClassroom.CourseId);
ViewBag.SemesterId = new SelectList(_context.Semesters, "Id", "Title", virtualClassroom.SemesterId);
return(View(virtualClassroom));
}
public ActionResult Create(VirtualClassroomFormViewModel viewModel, string[] selectedInstructors, string[] selectedStudents)
{
if (!ModelState.IsValid)
{
viewModel.Courses = _context.Courses.ToList();
return(View("_Create", viewModel));
}
var virtualClassroom = new VirtualClassroom
{
AdministratorId = User.Identity.GetUserId(),
ClassroomName = viewModel.ClassroomName,
SemesterId = viewModel.SemesterId,
CourseId = viewModel.CourseId,
Instructors = new List <Instructor>(),
Students = new List <Student>()
};
foreach (var instructorId in selectedInstructors)
{
var instructors = _context.Instructors.Find(int.Parse(instructorId));
virtualClassroom.Instructors.Add(instructors);
}
foreach (var studentId in selectedStudents)
{
var students = _context.Students.Find(int.Parse(studentId));
virtualClassroom.Students.Add(students);
}
_context.VirtualClassrooms.Add(virtualClassroom);
_context.SaveChanges();
return(RedirectToAction("AdminIndex"));
}
public ActionResult Edit(int?id, string[] selectedInstructors, string[] selectedStudents)
{
if (id == null)
{
return(new HttpStatusCodeResult(HttpStatusCode.BadRequest));
}
VirtualClassroom virtualInstructor =
_context.VirtualClassrooms
.Include(s => s.Instructors)
.Single(v => v.Id == id);
VirtualClassroom virtualStudent =
_context.VirtualClassrooms
.Include(s => s.Students)
.Single(v => v.Id == id);
if (TryUpdateModel(virtualInstructor, "",
new string[] { "Id", "ClassroomName", "CourseId", "SemesterId" }))
{
try
{
UpdateClassroomInstructors(selectedInstructors, virtualInstructor);
UpdateClassroomStudents(selectedStudents, virtualStudent);
_context.SaveChanges();
return(RedirectToAction("AdminIndex"));
}
catch (RetryLimitExceededException)
{
ModelState.AddModelError("", "Unable to save changes. Try again, and if the problem persists, see your system administrator.");
}
}
else if (TryUpdateModel(virtualStudent, "",
new string[] { "Id", "ClassroomName", "CourseId", "SemesterId" }))
{
try
{
UpdateClassroomStudents(selectedStudents, virtualStudent);
UpdateClassroomInstructors(selectedInstructors, virtualInstructor);
_context.SaveChanges();
return(RedirectToAction("AdminIndex"));
}
catch (RetryLimitExceededException)
{
ModelState.AddModelError("", "Unable to save changes. Try again, and if the problem persists, see your system administrator.");
}
}
PopulateAssignedInstructorData(virtualInstructor);
PopulateAssignedStudentData(virtualStudent);
VirtualClassroom virtualClassroom = _context.VirtualClassrooms.Find(id);
if (ModelState.IsValid)
{
_context.Entry(virtualClassroom).State = EntityState.Modified;
_context.SaveChanges();
return(RedirectToAction("AdminIndex"));
}
ViewBag.CourseId = new SelectList(_context.Courses, "Id", "Name", virtualClassroom.CourseId);
ViewBag.SemesterId = new SelectList(_context.Semesters, "Id", "Title", virtualClassroom.SemesterId);
return(View(virtualClassroom));
}
private void PopulateAssignedStudentData(VirtualClassroom virtualClassroom)
{
var allStudents = _context.Students.OrderBy(i => i.LastName);
var classroomStudents = new HashSet <int>(virtualClassroom.Students.Select(c => c.StudentId));
var viewModel = new List <AssignedStudentData>();
foreach (var student in allStudents)
{
viewModel.Add(new AssignedStudentData
{
StudentId = student.StudentId,
FullName = student.FullName,
Assigned = classroomStudents.Contains(student.StudentId)
});
}
ViewBag.Students = viewModel;
}
private void PopulateAssignedInstructorData(VirtualClassroom virtualClassroom)
{
var allInstructors = _context.Instructors.OrderBy(i => i.LastName);
var classroomInstructors = new HashSet <int>(virtualClassroom.Instructors.Select(c => c.InstructorId));
var viewModel = new List <AssignedInstructorData>();
foreach (var instructor in allInstructors)
{
viewModel.Add(new AssignedInstructorData
{
InstructorId = instructor.InstructorId,
FullName = instructor.FullName,
Assigned = classroomInstructors.Contains(instructor.InstructorId)
});
}
ViewBag.Instructors = viewModel;
}
