/// <summary>
/// This method adds a given student to the waitinglist for a give course
/// </summary>
/// <param name="courseID">The course id</param>
/// <param name="newStudent">The new student</param>
/// <returns>The new student</returns>
public StudentDTO AddStudentToWaitinglist(int courseID, StudentViewModel newStudent)
{
var course = _db.Courses.SingleOrDefault(x => x.ID == courseID);
if (course == null)
{
throw new CourseNotFoundException();
}
var student = _db.Students.SingleOrDefault(x => x.SSN == newStudent.SSN);
if (student == null)
{
throw new StudentNotFoundException();
}
var studentEnrollment = _db.StudentEnrollment.SingleOrDefault(x => x.StudentID == student.ID
&& x.CourseID == course.ID);
if (studentEnrollment == null)
{
_db.StudentEnrollment.Add(new Entities.StudentEnrollment
{
CourseID = course.ID,
StudentID = student.ID,
IsActive = true,
IsOnWaitingList = true
});
}
else if (studentEnrollment.IsOnWaitingList == true || studentEnrollment.IsActive == true)
{
// Check if the student is already on the waitinglist or registered in the course
throw new StudentAlreadyRegisteredInCourseException();
}
else if (studentEnrollment.IsActive == false) // Check if the student as been removed
{
studentEnrollment.IsOnWaitingList = true;
studentEnrollment.IsActive = true;
}
_db.SaveChanges();
return new StudentDTO
{
Name = student.Name,
SSN = student.SSN
};
}
public HttpResponseMessage AddStudent(int courseID, StudentViewModel studentVM)
{
if (!ModelState.IsValid)
{
throw new HttpResponseException(HttpStatusCode.PreconditionFailed);
}
bool studentAddedSuccessfully = _service.AddStudentToCourse(courseID, studentVM);
if (!studentAddedSuccessfully)
{
throw new HttpResponseException(HttpStatusCode.NotFound); //Í IHttpActionResult.. getur gert return StatusCode(...)
}
//Would return Created(location, studentDTO) but the API has no location for this object..
//Instead of this, want to use IHttpActionResult and [ResponseType].. then return Content(HttpStatusCode.Created, studentDTO)
return new HttpResponseMessage(HttpStatusCode.Created);
}
/// <summary>
/// Adds a student to a course. If the student doesn't exist, it is created.
/// </summary>
/// <param name="courseID">The ID of the course.</param>
/// <param name="studentVM">The student VM.</param>
/// <returns>True if successful, false if the course does not exist.</returns>
public bool AddStudentToCourse(int courseID, StudentViewModel studentVM)
{
//Does the course exist?
Course course = _context.Courses.Where(c => c.ID == courseID).SingleOrDefault();
if (course == null)
{
return false;
}
Student student = _context.Students.Where(s => s.SSN == studentVM.SSN).SingleOrDefault();
if (student == null)
{
student = new Student { Name = studentVM.Name, SSN = studentVM.SSN };
_context.Students.Add(student);
_context.SaveChanges();
}
StudentEnrollment studentEnrollment = new StudentEnrollment { StudentID = student.ID, CourseID = courseID };
_context.StudentEnrollment.Add(studentEnrollment);
_context.SaveChanges();
return true;
}
/// <summary>
/// This method adds a student to a given course
/// </summary>
/// <param name="courseID">The id of the course</param>
/// <param name="newStudent">The student to be added</param>
/// <returns>Details about the course, including a list of all students registerd in the course</returns>
public StudentDTO AddStudentToCourse(int courseID, StudentViewModel newStudent)
{
// Check if the course exists
var course = _db.Courses.SingleOrDefault(x => x.ID == courseID);
if (course == null)
{
throw new CourseNotFoundException();
}
// Check if the student exists
var student = _db.Students.SingleOrDefault(x => x.SSN == newStudent.SSN);
if (student == null)
{
throw new StudentNotFoundException();
}
// Check if the course is full
if (course.MaxStudents <= _db.StudentEnrollment.Count(x => x.CourseID == course.ID
&& x.IsActive == true
&& x.IsOnWaitingList == false))
{
throw new CourseIsFullException();
}
// Check if the student is already registered in the course
var studentEnrollment = _db.StudentEnrollment.SingleOrDefault(x => x.StudentID == student.ID && x.CourseID == course.ID);
if (studentEnrollment == null) // Student has not registered for the course
{
_db.StudentEnrollment.Add(new Entities.StudentEnrollment
{
StudentID = student.ID,
CourseID = course.ID,
IsOnWaitingList = false,
IsActive = true
});
}
else if (studentEnrollment.IsOnWaitingList == true) // Student is on the waitinglist
{
studentEnrollment.IsOnWaitingList = false;
studentEnrollment.IsActive = true;
}
else if (studentEnrollment.IsActive == false) // If the student enrollment has been deleted
{
studentEnrollment.IsActive = true;
}
else // Student is already in the course
{
throw new StudentAlreadyRegisteredInCourseException();
}
_db.SaveChanges();
return new StudentDTO
{
SSN = student.SSN,
Name = student.Name
};
}
/// <summary>
/// This method adds a student to a given course
/// </summary>
/// <param name="courseID">The id of the course</param>
/// <param name="newStudent">The student to be added</param>
/// <returns>Details about the course, including a list of all students registerd in the course</returns>
public StudentDTO AddStudentToCourse(int courseID, StudentViewModel newStudent)
{
// Check if the course exists
var course = _db.Courses.SingleOrDefault(x => x.ID == courseID);
var courseDetails = _db.CourseTemplates.SingleOrDefault(x => x.ID == course.TemplateID);
if (course == null)
{
throw new CourseNotFoundException();
}
// Check if the student exists
var student = _db.Students.SingleOrDefault(x => x.SSN == newStudent.SSN);
if (student == null)
{
throw new StudentNotFoundException();
}
_db.StudentEnrollment.Add(new Entities.StudentEnrollment
{
StudentID = student.ID,
CourseID = course.ID
});
_db.SaveChanges();
return new StudentDTO
{
SSN = student.SSN,
Name = student.Name
};
}
public IHttpActionResult AddStudentToWaitinglist(int id, StudentViewModel newStudent)
{
if (!ModelState.IsValid) { throw new HttpResponseException(HttpStatusCode.PreconditionFailed); }
try
{
return Ok(_service.AddStudentToWaitinglist(id, newStudent));
}
catch (CourseNotFoundException)
{
throw new HttpResponseException(HttpStatusCode.NotFound);
}
catch (StudentNotFoundException)
{
throw new HttpResponseException(HttpStatusCode.NotFound);
}
catch (StudentAlreadyRegisteredInCourseException)
{
throw new HttpResponseException(HttpStatusCode.PreconditionFailed);
}
}
public IHttpActionResult AddStudentToCourse(int id, StudentViewModel newStudent)
{
if (!ModelState.IsValid) { throw new HttpResponseException(HttpStatusCode.PreconditionFailed); }
try
{
StudentDTO student = _service.AddStudentToCourse(id, newStudent);
var location = Url.Link("GetStudentInCourse", new { id = id, ssn = student.SSN });
return Created(location, student);
}
catch (CourseNotFoundException)
{
throw new HttpResponseException(HttpStatusCode.NotFound);
}
catch (StudentNotFoundException)
{
throw new HttpResponseException(HttpStatusCode.NotFound);
}
catch (StudentAlreadyRegisteredInCourseException)
{
throw new HttpResponseException(HttpStatusCode.PreconditionFailed);
}
catch (CourseIsFullException)
{
throw new HttpResponseException(HttpStatusCode.PreconditionFailed);
}
}
/// <summary>
/// Adds a student to the waiting list of a course.
/// </summary>
/// <exception cref="AppObjectNotFoundException">Thrown if the course is not found.</exception>
/// <exception cref="DuplicateCourseRegistrationException">Thrown if the student is already enrolled to the course or to the waiting list.</exception>
/// <param name="courseID">ID of the course.</param>
/// <param name="studentID">ID of the student.</param>
public void AddStudentToWaitingList(int courseID, StudentViewModel student)
{
//Check if course exists
Course course = _context.Courses.SingleOrDefault(c => c.ID == courseID);
if (course == null)
{
throw new AppObjectNotFoundException();
}
int studentID = _context.Students.Where(s => s.SSN == student.SSN).Select(s => s.ID).SingleOrDefault();
if (studentID == 0)
{
throw new AppObjectNotFoundException();
}
//Check to see if the user is already on the waiting list (or registered)
StudentEnrollment enrollment = _context.StudentEnrollment.SingleOrDefault(se => se.StudentID == studentID && se.CourseID == courseID && se.IsDeleted == false);
if (enrollment != null)
{
throw new DuplicateCourseRegistrationException();
}
//Check if the user was deleted before from the course.. if so, we undelete him and put ont he waitin glist
enrollment = _context.StudentEnrollment.SingleOrDefault(se => se.StudentID == studentID && se.CourseID == courseID && se.IsDeleted == true);
if (enrollment != null)
{
enrollment.IsDeleted = false;
enrollment.IsOnWaitingList = true;
}
else
{
enrollment = new StudentEnrollment
{
CourseID = courseID,
StudentID = studentID,
IsOnWaitingList = true,
};
_context.StudentEnrollment.Add(enrollment);
}
_context.SaveChanges();
}
public IHttpActionResult AddStudentToWaitingList(int courseID, StudentViewModel student)
{
try
{
_service.AddStudentToWaitingList(courseID, student);
}
catch (AppObjectNotFoundException)
{
return NotFound();
}
catch (DuplicateCourseRegistrationException)
{
return StatusCode(HttpStatusCode.PreconditionFailed);
}
return StatusCode(HttpStatusCode.OK); //Should return OK according to the tester..
}
