/// <summary>
/// Adds the course.
/// </summary>
/// <param name="course">The course.</param>
/// <exception cref="CourseNumberNotUniqueException"></exception>
public void AddCourse(Course course)
{
using (_courseRepository)
{
// Check Unique on Name
if (_courseRepository.CourseNumberExists(course.CourseNumber))
throw new CourseNumberNotUniqueException();
if (_courseRepository.CourseNameExists(course.CourseName))
throw new CourseNameNotUniqueException();
_courseRepository.AddCourse(course);
}
}
/// <summary>
/// Adds the course.
/// </summary>
/// <param name="course">The course.</param>
public void AddCourse(Course course)
{
using (var dbTransaction = _db.Database.BeginTransaction())
{
try
{
_db.Courses.Add(course);
_db.SaveChanges();
dbTransaction.Commit();
}
catch (Exception)
{
dbTransaction.Rollback();
}
}
}
public JsonResult CreateUpdate(CourseViewModel viewModel)
{
if (!ModelState.IsValid)
return Json(new { error = true, message = "There were errors in the submission" });
var currentCourse = _courseService.GetCourseById(viewModel.Number);
// If the course does not exist in the db, add
if (currentCourse == null)
{
try
{
// Build the course object
var course = new Course()
{
CourseID = viewModel.Number,
CourseTitle = viewModel.Name,
HoursPerWeek = viewModel.WeeklyHours,
Description = viewModel.Description
};
// Add the course
_courseService.AddCourse(course);
return Json(new { error = false, message = "Course successfully created!" });
}
catch (CourseExistsException)
{
// If the course already exists, display error
return Json(new {error = true, message = "Course already exists"});
}
}
// Otherwise, update the fields
currentCourse.CourseID = viewModel.Number;
currentCourse.CourseTitle = viewModel.Name;
currentCourse.HoursPerWeek = viewModel.WeeklyHours;
currentCourse.Description = viewModel.Description;
// Update the course with the changes
_courseService.EditCourse(currentCourse);
return Json(new {error = false, message = "The changes have been made!"});
}
public void DeleteCourse(Course course)
{
var offerings = _dbContext.CourseOfferings.Where(o => o.Course_CourseID == course.CourseID).ToList();
foreach (var offering in offerings.ToList())
{
offerings.Remove(offering);
foreach (var studentsInOffering in _dbContext.Students)
{
foreach (var o in studentsInOffering.CourseOfferings.ToList())
{
studentsInOffering.CourseOfferings.Remove(o);
}
}
}
_dbContext.Courses.Remove(course);
}
public void EditCourse(Course course)
{
_dbContext.Entry(course).State = EntityState.Modified;
}
public void InsertCourse(Course course)
{
_dbContext.Courses.Add(course);
}
public bool CourseExists(Course course)
{
return _dbContext.Courses.Any(c => c.CourseID == course.CourseID);
}
/// <summary>
/// Edit a Course
/// </summary>
/// <param name="course">The course.</param>
/// <param name="courseName">Name of the course.</param>
/// <param name="courseDescription">The course description.</param>
/// <param name="weeklyHours">The weekly hours.</param>
public void EditCourse(Course course, string courseName, string courseDescription, int weeklyHours)
{
using (var dbTransaction = _db.Database.BeginTransaction())
{
try
{
course.CourseName = courseName;
course.CourseDescription = courseDescription;
course.WeeklyHours = weeklyHours;
_db.SaveChanges();
dbTransaction.Commit();
}
catch (Exception)
{
dbTransaction.Rollback();
}
}
}
