/// <summary>
/// Updates a course that already exists
/// Note that this edits a Course, not a CourseTemplate.
/// Only start and end date are editable
/// </summary>
/// <param name="courseID">The ID of the course to edit</param>
/// <param name="updateCourse">a course with the information to edit</param>
/// <returns></returns>
public CourseDetailsDTO UpdateCourse(int courseID, UpdateCourseViewModel updateCourse)
{
// Get the course, throw exception if the course is not found
Entities.Course course = _db.Courses.SingleOrDefault(x => x.ID == courseID);
if (course == null)
{
throw new CourseNotFoundException();
}
// Check if the course tamplate exists
var courseTemplate = _db.CourseTemplates.SingleOrDefault(x => x.ID == course.TemplateID);
if (courseTemplate == null)
{
throw new TemplateCourseNotFoundException();
}
// Update the start and end date based on the view model
course.StartDate = updateCourse.StartDate;
course.EndDate = updateCourse.EndDate;
course.MaxStudents = updateCourse.MaxStudents;
// If all is successfull, we save our changes
_db.SaveChanges();
return new CourseDetailsDTO
{
ID = course.ID,
TemplateID = courseTemplate.TemplateID,
Name = courseTemplate.Name,
Description = courseTemplate.Description,
Semester = course.Semester,
StartDate = updateCourse.StartDate,
EndDate = updateCourse.EndDate,
StudentCount = _db.StudentEnrollment.Count(x => x.CourseID == course.ID
&& x.IsActive == true
&& x.IsOnWaitingList == false),
Students = (from sr in _db.StudentEnrollment
join s in _db.Students on sr.StudentID equals s.ID
where sr.CourseID == course.ID
&& sr.IsActive == true
&& sr.IsOnWaitingList == false
select new StudentDTO
{
SSN = s.SSN,
Name = s.Name
}).ToList()
};
}
public IHttpActionResult UpdateCourse(int id, UpdateCourseViewModel editedCourse)
{
if (!ModelState.IsValid || editedCourse.StartDate.Equals(DateTime.MinValue) || editedCourse.EndDate.Equals(DateTime.MinValue))
{
throw new HttpResponseException(HttpStatusCode.PreconditionFailed);
}
try
{
CourseDetailsDTO course = _service.UpdateCourse(id, editedCourse);
var location = Url.Link("GetCourse", new { id = course.ID });
return Created(location, course);
}
catch (CourseNotFoundException)
{
throw new HttpResponseException(HttpStatusCode.NotFound);
}
}
