public void UpdateCourse(Course course)
{
using (AcademyContext academyDb = new AcademyContext(options))
{
academyDb.Course.Update(course);
academyDb.SaveChanges();
}
}
// User table
public User GetUser(User user)
{
using (AcademyContext academyDb = new AcademyContext(options))
{
return(academyDb.User
.Include(u => u.Role)
.FirstOrDefault(u => u.Email == user.Email && u.Password == user.Password));
}
}
public void DeleteHomeTaskAssessment(int id)
{
using (AcademyContext academyDb = new AcademyContext(options))
{
HomeTaskAssessment homeTaskAssessment = GetHomeTaskAssessment(id);
DeleteHomeTaskAssessment(homeTaskAssessment);
academyDb.SaveChanges();
}
}
public void DeleteStudent(int id)
{
using (AcademyContext academyDb = new AcademyContext(options))
{
Student student = GetStudent(id);
DeleteStudent(student);
academyDb.SaveChanges();
}
}
public void DeleteHomeTask(int id)
{
using (AcademyContext academyDb = new AcademyContext(options))
{
HomeTask homeTask = GetHomeTask(id);
DeleteHomeTask(homeTask);
academyDb.SaveChanges();
}
}
public void DeleteLecturer(int id)
{
using (AcademyContext academyDb = new AcademyContext(options))
{
Lecturer lecturer = GetLecturer(id);
DeleteLecturer(lecturer);
academyDb.SaveChanges();
}
}
public void AssignStudentsToCourse(int courseId, IEnumerable <int> assignedStudentsIds)
{
using (AcademyContext academyDb = new AcademyContext(options))
{
using (var transaction = academyDb.Database.BeginTransaction())
{
List <int> previouslyAssignedstudentsIds = academyDb.StudentCourse.Where(sc => sc.CourseId == courseId).Select(sc => sc.StudentId).ToList();
List <int> disassignedStudentsIds = previouslyAssignedstudentsIds.Except(assignedStudentsIds).ToList();
List <int> newAssignedStudentsIds = assignedStudentsIds.Except(previouslyAssignedstudentsIds).ToList();
// delete disassigned students assessments
foreach (var disStId in disassignedStudentsIds)
{
// todo remove range not necessary
academyDb.HomeTaskAssessment.RemoveRange(
academyDb.HomeTaskAssessment.Where(ha => ha.StudentId == disStId));
}
// disassigne disassigned students
foreach (var disStId in disassignedStudentsIds)
{
// todo remove range not necessary
academyDb.StudentCourse.RemoveRange(
academyDb.StudentCourse.Where(sc => sc.StudentId == disStId));
}
// assign new assigned students
foreach (var asi in newAssignedStudentsIds)
{
academyDb.StudentCourse.Add(new StudentCourse()
{
StudentId = asi, CourseId = courseId
});
}
// create assessments for new assigned students
List <int> courseHometasksIds = academyDb.HomeTask.Where(h => h.CourseId == courseId).Select(h => h.Id).ToList();
foreach (var studentId in newAssignedStudentsIds)
{
foreach (var hometaskId in courseHometasksIds)
{
HomeTaskAssessment assessment = new HomeTaskAssessment()
{
IsComplete = false,
Date = DateTime.Now,
HomeTaskId = hometaskId,
StudentId = studentId
};
academyDb.HomeTaskAssessment.Add(assessment);
}
}
academyDb.SaveChanges();
transaction.Commit();
}
}
}
public void DeleteCourse(int id)
{
using (AcademyContext academyDb = new AcademyContext(options))
{
Course course = GetCourse(id);
DeleteCourse(course);
academyDb.SaveChanges();
}
}
public void CreateUser(User user)
{
using (AcademyContext academyDb = new AcademyContext(options))
{
Role userRole = academyDb.Role.FirstOrDefault(r => r.Name == "user");
if (userRole != null)
{
user.Role = userRole;
}
academyDb.User.Add(user);
academyDb.SaveChanges();
}
}
public List <HomeTaskAssessment> GetHomeTaskAssessmentsByStudentId(int studentId)
{
using (AcademyContext academyDb = new AcademyContext(options))
{
List <HomeTaskAssessment> studentAssessments = academyDb.HomeTaskAssessment.Where(a => a.StudentId == studentId).ToList();
foreach (var assessment in studentAssessments)
{
assessment.HomeTask = academyDb.HomeTask.FirstOrDefault(h => h.Id == assessment.HomeTaskId);
assessment.HomeTask.Course = academyDb.Course.FirstOrDefault(c => c.Id == assessment.HomeTask.CourseId);
}
return(studentAssessments);
}
}
public void DeleteLecturer(Lecturer lecturer)
{
using (AcademyContext academyDb = new AcademyContext(options))
{
using (var transaction = academyDb.Database.BeginTransaction())
{
// delete course from lecturer-courcse table
var lectureCoursesForDelete = academyDb.LecturerCourse.Where(lc => lc.LecturerId == lecturer.Id);
foreach (var lc in lectureCoursesForDelete)
{
academyDb.LecturerCourse.Remove(lc);
}
// delete lecturer
academyDb.Lecturer.Remove(lecturer);
academyDb.SaveChanges();
transaction.Commit();
}
}
}
public void DeleteHomeTask(HomeTask homeTask)
{
using (AcademyContext academyDb = new AcademyContext(options))
{
using (var transaction = academyDb.Database.BeginTransaction())
{
// delete hometask assessments
var hometaskAssessmentsForDelete = academyDb.HomeTaskAssessment.Where(a => a.HomeTaskId == homeTask.Id);
foreach (var ha in hometaskAssessmentsForDelete)
{
academyDb.HomeTaskAssessment.Remove(ha);
}
// delete hometask
academyDb.HomeTask.Remove(homeTask);
academyDb.SaveChanges();
transaction.Commit();
}
}
}
public void DeleteCourse(Course course)
{
using (AcademyContext academyDb = new AcademyContext(options))
{
using (var transaction = academyDb.Database.BeginTransaction())
{
// delete course from lecturer-courcse table
var lectureCoursesForDelete = academyDb.LecturerCourse.Where(lc => lc.CourseId == course.Id);
foreach (var lcd in lectureCoursesForDelete)
{
academyDb.LecturerCourse.Remove(lcd);
}
// delete course from student-courcse table
var studentCoursesForDelete = academyDb.StudentCourse.Where(sc => sc.CourseId == course.Id);
foreach (var sc in studentCoursesForDelete)
{
academyDb.StudentCourse.Remove(sc);
}
// delete assessment from HomeTaskAssessment table
// delete hometasks from Hometask table
var hometasksForDelete = academyDb.HomeTask.Where(h => h.CourseId == course.Id);
foreach (var hd in hometasksForDelete)
{
var assessmentsForDelete = academyDb.HomeTaskAssessment.Where(ha => ha.HomeTaskId == hd.Id);
foreach (var ad in assessmentsForDelete)
{
academyDb.HomeTaskAssessment.Remove(ad);
}
academyDb.HomeTask.Remove(hd);
}
// delete course
academyDb.Course.Remove(course);
academyDb.SaveChanges();
transaction.Commit();
}
}
}
public void AssignLecturersToCourse(int courseId, List <int> lecturersIds)
{
using (AcademyContext academyDb = new AcademyContext(options))
{
// get all course notations
var lectCour = academyDb.LecturerCourse.Where(lc => lc.CourseId == courseId);
foreach (var lc in lectCour)
{
academyDb.LecturerCourse.Remove(lc);
}
foreach (var lcId in lecturersIds)
{
academyDb.LecturerCourse.Add(new LecturerCourse()
{
LecturerId = lcId, CourseId = courseId
});
}
academyDb.SaveChanges();
}
}
public void CreateHomeTask(HomeTask homeTask)
{
// create hometask
using (AcademyContext academyDb = new AcademyContext(options))
{
academyDb.HomeTask.Add(homeTask);
academyDb.SaveChanges();
}
using (AcademyContext academyDb = new AcademyContext(options))
{
if (academyDb.StudentCourse.Where(sc => sc.CourseId == homeTask.CourseId).Count() > 0)
{
// create assessments for all students in course without assessments
List <int> courseHometasksIds = academyDb.HomeTask.Where(h => h.CourseId == homeTask.CourseId).Select(h => h.Id).ToList();
List <int> courseStudentsIds = academyDb.StudentCourse.Where(st => st.CourseId == homeTask.CourseId).Select(st => st.StudentId).ToList();
foreach (var hi in courseHometasksIds)
{
if (academyDb.HomeTaskAssessment.Where(ha => ha.HomeTaskId == hi).Count() == 0)
{
foreach (var csi in courseStudentsIds)
{
academyDb.HomeTaskAssessment.Add(
new HomeTaskAssessment()
{
IsComplete = false,
Date = DateTime.Now,
HomeTaskId = homeTask.Id,
StudentId = csi
});
}
}
}
academyDb.SaveChanges();
}
}
}
