/// <summary>
/// Get an assignment by the assignment's ID
/// </summary>
public TeacherCreateAssignmentViewModel GetAssignmentById(int assignmentId)
{
var assignment = _db.Assignments.SingleOrDefault(x => x.Id == assignmentId);
if (assignment != null)
{
var model = new TeacherCreateAssignmentViewModel {
Name = assignment.Name,
Description = assignment.Description,
CourseInstanceId = assignment.CourseInstanceId,
EndTime = assignment.EndTime.ToString(),
StartTime = assignment.StartTime.ToString(),
MaxCollaborators = assignment.MaxCollaborators,
Problems = new List <TeacherAssignmentProblemViewModel>()
};
var problems = _db.AssignmentProblems.Where(x => x.AssignmentId == assignmentId);
foreach (var assignmentProblem in problems)
{
model.Problems.Add(new TeacherAssignmentProblemViewModel {
MaxSubmissions = assignmentProblem.MaxSubmissions,
ProblemId = assignmentProblem.ProblemId,
Weight = assignmentProblem.Weight
});
}
return(model);
}
return(null);
}
/// <summary>
/// Update assignment information via TeacherCreateAssignmentViewModel
/// </summary>
public bool UpdateAssignment(TeacherCreateAssignmentViewModel assignment)
{
var dbAssignment = _db.Assignments.SingleOrDefault(x => x.Id == assignment.Id);
if (dbAssignment != null)
{
dbAssignment.Description = assignment.Description;
dbAssignment.Name = assignment.Name;
dbAssignment.EndTime = DateTime.Parse(assignment.EndTime);
dbAssignment.StartTime = DateTime.Parse(assignment.StartTime);
dbAssignment.MaxCollaborators = assignment.MaxCollaborators;
// Remove problems
foreach (var assignmentProblem in _db.AssignmentProblems.Where(x => x.AssignmentId == assignment.Id))
{
var found = assignment.Problems.Any(problem => assignmentProblem.ProblemId == problem.ProblemId);
if (!found)
{
RemoveProblemFromAssignmentByIds(assignmentProblem.AssignmentId, assignmentProblem.ProblemId);
}
}
// Add/Edit existing problems
foreach (var problem in assignment.Problems)
{
var dbAssignmentProblem = _db.AssignmentProblems.SingleOrDefault(x => x.AssignmentId == assignment.Id && x.ProblemId == problem.ProblemId);
if (dbAssignmentProblem != null)
{
dbAssignmentProblem.MaxSubmissions = problem.MaxSubmissions;
dbAssignmentProblem.Weight = (byte)problem.Weight;
}
else
{
var newAssignmentProblem = new AssignmentProblem {
ProblemId = problem.ProblemId,
AssignmentId = assignment.Id,
Weight = (byte)problem.Weight,
MaxSubmissions = problem.MaxSubmissions
};
_db.AssignmentProblems.Add(newAssignmentProblem);
}
}
try {
_db.SaveChanges();
return(true);
}
catch (Exception e) {
return(false);
}
}
return(false);
}
/// <summary>
/// Create a new assignment via TeacherCreateAssignmentViewModel
/// </summary>
public bool CreateNewAssignment(TeacherCreateAssignmentViewModel assignment)
{
var newAssignment = new Assignment {
CourseInstanceId = assignment.CourseInstanceId,
Description = assignment.Description,
EndTime = DateTime.Parse(assignment.EndTime),
StartTime = DateTime.Parse(assignment.StartTime),
Name = assignment.Name,
MaxCollaborators = assignment.MaxCollaborators,
IsGraded = false
};
newAssignment = _db.Assignments.Add(newAssignment);
foreach (var assignmentProblem in assignment.Problems)
{
var problem = _db.Problems.SingleOrDefault(x => x.Id == assignmentProblem.ProblemId);
if (problem == null)
{
continue;
}
var newAssignmentProblem = new AssignmentProblem {
ProblemId = problem.Id,
AssignmentId = newAssignment.Id,
Weight = (byte)assignmentProblem.Weight,
MaxSubmissions = assignmentProblem.MaxSubmissions
};
_db.AssignmentProblems.Add(newAssignmentProblem);
}
var students = _courseService.GetAllStudentsInCourseInstance(newAssignment.CourseInstanceId);
// Create groups for students
var count = 1;
foreach (var student in students)
{
_db.AssignmentGroups.Add(new AssignmentGroup {
UserId = student.Id,
AssignmentId = newAssignment.Id,
GroupNumber = count
});
count++;
}
try {
_db.SaveChanges();
return(true);
}
catch (Exception e) {
return(false);
}
}
/// <summary>
/// Edit an assignment's information and linked problems
/// </summary>
public ActionResult EditAssignmentInformation(TeacherCreateAssignmentViewModel assignment)
{
return(Json(_teacherService.UpdateAssignment(assignment)));
}
public ActionResult NewAssignment(TeacherCreateAssignmentViewModel assignment)
{
return(Json(_teacherService.CreateNewAssignment(assignment)));
}