/// <summary>
/// Returns all the ScoreUnits associated with the given WorkItem
/// </summary>
/// <param name="workItem">WorkItem for which to return ScoreUnits</param>
/// <returns>Creates new ScoreUnits for all students who have none</returns>
public async Task<IEnumerable<ScoreUnit>> GetScoreUnits(WorkItem workItem)
{
ClassManager classManager = new ClassManager(_db, _userManager);
var students = await classManager.GetAcceptedStudents(workItem.Class);
var newScoreUnits = new List<ScoreUnit>();
var scoreUnits = await _db.ScoreUnits
.Include(su => su.Student)
.Where(su => su.WorkItem.Id == workItem.Id).ToDictionaryAsync(su => su.Student.Id);
// Create new ScoreUnits for those who don't have one
foreach(var student in students)
{
if(!scoreUnits.ContainsKey(student.Id))
{
var newScoreUnit = new ScoreUnit();
newScoreUnit.WorkItem = workItem;
newScoreUnit.Student = student;
newScoreUnit.Grade = null;
newScoreUnits.Add(newScoreUnit);
}
}
var addedScoreUnits = _db.ScoreUnits.AddRange(newScoreUnits);
await _db.SaveChangesAsync();
// Convert dictionary to list and add new ScoreUnits
var result = scoreUnits.Select(kvp => kvp.Value).ToList();
result.AddRange(addedScoreUnits);
return result;
}
/// <summary>
/// Creates a new WorkItem from the given model
/// </summary>
/// <param name="cwvm">Model containing the detail of the WorkItem to create</param>
/// <returns>Null if the class or teacher is not found, Otherwise, returns the WorkItem created</returns>
public async Task<WorkItem> CreateWorkItem(CreateWorkItemViewModel cwvm)
{
var @class = await Db.Classes.FindAsync(cwvm.ClassId);
if(@class == null)
{
return null;
}
WorkItem workItem = new WorkItem
{
Title = cwvm.Title,
Description = cwvm.Description,
DueDate = cwvm.DueDate,
MaxPoints = cwvm.MaxPoints,
Type = cwvm.Type,
Class = @class
};
Db.WorkItems.Add(workItem);
await Db.SaveChangesAsync();
return workItem;
}
/// <summary>
/// Returns a students ScoreUnit for a WorkItem
/// </summary>
/// <param name="workItem">WorkItem to return the ScoreUnit for</param>
/// <param name="student">Student to return the ScorreUnit for</param>
/// <returns></returns>
public async Task<ScoreUnit> GetStudentScoreUnit(WorkItem workItem, ApplicationUser student)
{
return await _db.ScoreUnits.Where(su => su.WorkItem.Id == workItem.Id && su.Student.Id == student.Id).FirstOrDefaultAsync();
}
/// <summary>
/// Creates a view-model for the given WorkItem
/// </summary>
/// <param name="workItem">Model after which the view-model is created</param>
public WorkItemViewModel(WorkItem workItem)
{
if(workItem != null)
{
Id = workItem.Id;
Title = workItem.Title;
Description = workItem.Description;
DueDate = workItem.DueDate;
MaxPoints = workItem.MaxPoints;
Type = workItem.Type;
Class = new ClassViewModel(workItem.Class);
}
}
