/// <summary>
/// Returns a single course with the specified ID
/// If no course is found then a course not found exception is thrown
/// </summary>
/// <param name="courseModel"></param>
/// <returns></returns>
public CourseInstanceDTO GetCourseInstanceByID(int ID)
{
var course = _courseInstances.All().SingleOrDefault(x => x.ID == ID);
var courseTemplate = _courseTemplates.All().SingleOrDefault(x => x.CourseID == course.CourseID);
if (course == null || courseTemplate == null)
{
throw new AppObjectNotFoundException();
}
var returnValue = new CourseInstanceDTO
{
Name = courseTemplate.Name,
CourseInstanceID = course.ID,
MainTeacher = "",
TemplateID = courseTemplate.CourseID
};
return returnValue;
}
/// <summary>
/// You should write tests for this function. You will also need to
/// modify it, such that it will correctly return the name of the main
/// teacher of each course.
/// </summary>
/// <param name="semester"></param>
/// <returns></returns>
public List<CourseInstanceDTO> GetCourseInstancesBySemester(string semester = null)
{
if (string.IsNullOrEmpty(semester))
{
semester = "20153";
}
var coursesLeftQuery = (from c in _courseInstances.All()
join ct in _courseTemplates.All() on c.CourseID equals ct.CourseID
where c.SemesterID == semester
select new
{
ID = c.ID,
CourseID = c.CourseID,
SemesterID = c.SemesterID,
Name = ct.Name
}).ToList();
var teachersRightQuery = (from tr in _teacherRegistrations.All()
join p in _persons.All() on tr.SSN equals p.SSN
where tr.Type == TeacherType.MainTeacher
select new
{
CourseInstanceID = tr.CourseInstanceID,
SSN = tr.SSN,
Type = tr.Type,
Name = p.Name
}).ToList();
List<CourseInstanceDTO> result = new List<CourseInstanceDTO>();
foreach(var c in coursesLeftQuery)
{
var dto = new CourseInstanceDTO
{
Name = c.Name,
TemplateID = c.CourseID,
CourseInstanceID = c.ID,
MainTeacher = ""
};
foreach (var tr in teachersRightQuery)
{
if(c.ID == tr.CourseInstanceID && tr.Type == TeacherType.MainTeacher)
{
dto.MainTeacher = tr.Name;
}
}
result.Add(dto);
}
return result;
}