// GET: Instructors/Edit/5
public async Task <IActionResult> Edit(int?id)
{
if (id == null)
{
return(NotFound());
}
InstructorCoursesViewModel instructorCoursesVM = new InstructorCoursesViewModel();
//var instructor = await _context.Instructors.FindAsync(id);
instructorCoursesVM.Instructor = await _context.Instructors
.Include(i => i.OfficeAssignment)
.Include(i => i.CourseAssignments).ThenInclude(i => i.Course)
.AsNoTracking()
.FirstOrDefaultAsync(m => m.ID == id);
if (instructorCoursesVM.Instructor == null)
{
return(NotFound());
}
PopulateAssignedCourseData(instructorCoursesVM.Instructor);
instructorCoursesVM.AssignedCourseDataList = this.AssignedCourseDataList;
return(View(instructorCoursesVM));
}
public async Task <IActionResult> Edit(int?id, string[] selectedCourses,
[Bind("ID,LastName,FirstMidName,HireDate")] Instructor instructor)
{
if (id != instructor.ID)
{
return(NotFound());
}
InstructorCoursesViewModel instructorCoursesVM = new InstructorCoursesViewModel();
instructorCoursesVM.Instructor = await _context.Instructors
.Include(i => i.OfficeAssignment)
.Include(i => i.CourseAssignments)
.ThenInclude(i => i.Course)
.FirstOrDefaultAsync(s => s.ID == id);
if (instructorCoursesVM.Instructor == null)
{
return(NotFound());
}
if (await TryUpdateModelAsync <Instructor>(
instructorCoursesVM.Instructor,
"Instructor",
i => i.FirstMidName, i => i.LastName,
i => i.HireDate, i => i.OfficeAssignment))
{
if (String.IsNullOrWhiteSpace(
instructorCoursesVM.Instructor.OfficeAssignment?.Location))
{
instructorCoursesVM.Instructor.OfficeAssignment = null;
}
UpdateInstructorCourses(selectedCourses, instructorCoursesVM.Instructor);
try
{
//_context.Update(instructor);
await _context.SaveChangesAsync();
}
catch (DbUpdateConcurrencyException)
{
if (!InstructorExists(instructor.ID))
{
return(NotFound());
}
else
{
throw;
}
}
return(RedirectToAction(nameof(Index)));
}
//These method calls restore the assigned course data entered on the page, when it is redisplayed with an error message
UpdateInstructorCourses(selectedCourses, instructorCoursesVM.Instructor);
PopulateAssignedCourseData(instructorCoursesVM.Instructor);
instructorCoursesVM.AssignedCourseDataList = this.AssignedCourseDataList;
return(View(instructorCoursesVM));
}
// GET: Instructors/Create
public IActionResult Create()
{
InstructorCoursesViewModel instructorCoursesVM = new InstructorCoursesViewModel();
instructorCoursesVM.Instructor = new Instructor();
instructorCoursesVM.Instructor.CourseAssignments = new List <CourseAssignment>();
// Provides an empty collection for the foreach loop
// foreach (var course in Model.AssignedCourseDataList)
// in the Create Razor page.
PopulateAssignedCourseData(instructorCoursesVM.Instructor);
instructorCoursesVM.AssignedCourseDataList = this.AssignedCourseDataList;
return(View(instructorCoursesVM));
}
public async Task <IActionResult> Create(string[] selectedCourses,
[Bind("ID,LastName,FirstMidName,HireDate")] Instructor instructor)
{
InstructorCoursesViewModel instructorCoursesVM = new InstructorCoursesViewModel();
instructorCoursesVM.Instructor = new Instructor();
if (selectedCourses != null)
{
instructorCoursesVM.Instructor.CourseAssignments = new List <CourseAssignment>();
foreach (var course in selectedCourses)
{
var courseToAdd = new CourseAssignment
{
// Note that only CourseID is populated because InstructorID does not exist
// until new instructor is created by SaveChangesAsync() below
CourseID = int.Parse(course)
};
instructorCoursesVM.Instructor.CourseAssignments.Add(courseToAdd);
}
}
if (await TryUpdateModelAsync <Instructor>(
instructorCoursesVM.Instructor,
"Instructor",
i => i.FirstMidName, i => i.LastName,
i => i.HireDate, i => i.OfficeAssignment))
{
_context.Instructors.Add(instructorCoursesVM.Instructor);
await _context.SaveChangesAsync();
return(RedirectToAction(nameof(Index)));
}
// Something went wrong. Redirect to create instructor view
PopulateAssignedCourseData(instructorCoursesVM.Instructor);
instructorCoursesVM.AssignedCourseDataList = this.AssignedCourseDataList;
return(View(instructorCoursesVM));
}
