public ActionResult NewTeacher(ListTeacherViewModel model)
{
// Agrega un nuevo profesor al sistema
try
{
if (ModelState.IsValid) // Checkea los DataAnnotations de ListTeacherViewModel, o sea los [Required]
{
// Si es un modelo válido, agregar el nuevo profe a la base
using (Models.DBContainer db = new Models.DBContainer())
{
Teacher teacher = new Teacher();
teacher.first_name = model.first_name;
teacher.last_name = model.last_name;
teacher.active = model.active;
db.Teachers.Add(teacher);
db.SaveChanges();
}
return(RedirectToAction("ListTeachers", "Admin"));
}
return(View(model));
}
catch (Exception exc)
{
throw new Exception(exc.Message);
}
}
public ActionResult EditTeacher(ListTeacherViewModel model)
{
// Edita al profe y lo persiste en la base de datos
try
{
if (ModelState.IsValid)
{
using (Models.DBContainer db = new Models.DBContainer())
{
Teacher teacher = db.Teachers.Find(model.id_teacher);
if (teacher == null)
{
TempData["Alert"] = "An error occurred, try again later";
return(RedirectToAction("ListTeachers"));
}
teacher.first_name = model.first_name;
teacher.last_name = model.last_name;
teacher.active = model.active;
db.Entry(teacher).State = System.Data.Entity.EntityState.Modified;
db.SaveChanges();
}
return(RedirectToAction("ListTeachers", "Admin"));
}
return(View(model));
}
catch (Exception exc)
{
throw new Exception(exc.Message);
}
}
public ActionResult EditSubject(ListSubjectViewModelAdmin model)
{
// Modifica la materia y la persiste en la base de datos
try
{
if (ModelState.IsValid)
{
using (Models.DBContainer db = new Models.DBContainer())
{
Subject subject = db.Subjects.Find(model.id_subject);
if (subject == null)
{
TempData["Alert"] = "An error occurred, try again later";
return(RedirectToAction("ListSubjects"));
}
subject.name = model.name;
subject.desc = model.description;
subject.capacity = model.capacity;
subject.time_from = model.time_from;
subject.time_to = model.time_to;
subject.id_teacher = model.id_teacher;
if (subject.time_to <= subject.time_from)
{
// Horario no válido
ViewData["Error"] = "Ending time must be strictly greater than starting time";
PopulateDropDownList();
return(View(model));
}
db.Entry(subject).State = System.Data.Entity.EntityState.Modified;
db.SaveChanges();
}
return(RedirectToAction("ListSubjects", "Admin"));
}
// Si el modelo no es válido, tengo que volver a la misma pantalla, con
// lo cual hay que rellenar de nuevo el DropDownList
PopulateDropDownList();
return(View(model));
}
catch (Exception exc)
{
throw new Exception(exc.Message);
}
}
public ActionResult NewSubject(ListSubjectViewModelAdmin model)
{
// Crea una nueva materia y la guarda en el sistema
try
{
if (ModelState.IsValid)
{
using (Models.DBContainer db = new Models.DBContainer())
{
Subject subject = new Subject();
subject.name = model.name;
subject.desc = model.description;
subject.capacity = model.capacity;
subject.time_from = model.time_from;
subject.time_to = model.time_to;
subject.id_teacher = model.id_teacher;
if (subject.time_to <= subject.time_from)
{
// Horario no válido
ViewData["Error"] = "Ending time must be strictly greater than starting time";
PopulateDropDownList();
return(View(model));
}
db.Subjects.Add(subject);
db.SaveChanges();
}
return(RedirectToAction("ListSubjects", "Admin"));
}
// Si el modelo no es válido, tengo que volver a la misma pantalla, con
// lo cual hay que rellenar de nuevo el DropDownList
PopulateDropDownList();
return(View(model));
}
catch (Exception exc)
{
throw new Exception(exc.Message);
}
}
public ActionResult DeleteSubject(int id)
{
// Elimina la materia cuyo id_subject es id
try
{
using (Models.DBContainer db = new Models.DBContainer())
{
Subject subject = db.Subjects.Find(id);
if (subject == null)
{
TempData["Alert"] = "An error occurred, try again later";
return(RedirectToAction("ListSubjects"));
}
db.Subjects.Remove(subject);
db.SaveChanges();
}
return(RedirectToAction("ListSubjects", "Admin"));
}
catch (Exception exc)
{
throw new Exception(exc.Message);
}
}
public ActionResult DeleteTeacher(int id)
{
// Elimina al profesor del sistema
try
{
using (Models.DBContainer db = new Models.DBContainer())
{
Teacher teacher = db.Teachers.Find(id);
if (teacher == null)
{
TempData["Alert"] = "An error occurred, try again later";
return(RedirectToAction("ListTeachers"));
}
db.Teachers.Remove(teacher);
db.SaveChanges();
}
return(RedirectToAction("ListTeachers", "Admin"));
}
catch (Exception exc)
{
throw new Exception(exc.Message);
}
}
public ActionResult Enroll(int id_subject)
{
// Recibe por post el id de la materia y trata de inscribirte a la misma
try
{
using (Models.DBContainer db = new Models.DBContainer())
{
int id_student = ((Student)Session["User"]).id_student;
// Esto es lo mismo de un metodo anterior que esta arriba... hacer alguna funcion para no repetir el codigo
// Veo si el alumno ya está inscripto en la materia revisando los registros
// de la tabla Subjects_Students
var course = (from sub_stu in db.Subjects_Students
where sub_stu.id_student == id_student && sub_stu.id_subject == id_subject
select sub_stu).FirstOrDefault();
if (course != null)
{
// El estudiante ya está inscripto, mandar a la lista de materias con un mensaje
ViewData["EnrollMessage"] = "You're already enrolled in this subject";
ViewData["TypeMessage"] = "alert-warning";
return(View());
}
// Obtengo la lista de los horarios de todas las materias en las que el
// estudiante se inscribió
var lst_schedules = (from subject in db.Subjects
join sub_stu in db.Subjects_Students
on subject.id_subject equals sub_stu.id_subject
where sub_stu.id_student == id_student
select new Schedule
{
time_from = subject.time_from,
time_to = subject.time_to
}).ToList();
// Obtengo el horario de la materia a la cual se desea inscribir
var subject_schedule = (from subject in db.Subjects
where subject.id_subject == id_subject
select new Schedule
{
time_from = subject.time_from,
time_to = subject.time_to
}).FirstOrDefault();
if (subject_schedule == null)
{
ViewData["EnrollMessage"] = "An error occurred, try again later";
ViewData["TypeMessage"] = "alert-danger";
return(View());
}
// Recorro la lista de horarios de las inscripciones del estudiante
// buscando si hay algun solapamiento de horarios
foreach (var schedule in lst_schedules)
{
if (StartsInMiddle(schedule, subject_schedule) ||
StartsInMiddle(subject_schedule, schedule))
{
ViewData["EnrollMessage"] = "This course overlaps with any other subject that you already enrolled. You can't enroll in this course";
ViewData["TypeMessage"] = "alert-info";
return(View());
}
}
// Si llegó hasta acá significa que no hay horarios solapados...
// Inscribirlo en la materia
Subject_Student new_subject_student = new Subject_Student();
new_subject_student.id_student = ((Student)Session["User"]).id_student;
new_subject_student.id_subject = id_subject;
db.Subjects_Students.Add(new_subject_student);
db.SaveChanges();
}
ViewData["EnrollMessage"] = "The enrollment has been successful";
ViewData["TypeMessage"] = "alert-success";
return(View());
}
catch
{
ViewData["EnrollMessage"] = "An error occurred, try again later";
ViewData["TypeMessage"] = "alert-danger";
return(View());
}
}
