How to GroupBy Virtual Column - asp.net-mvc

Question

Hello I have problems Table for Reeves and I am trying to check which reeve creates most problem. So here is my Problem Model;
public int Id { get; set; }
public string Name { get; set; }
public string Text { get; set; }
public short Sira { get; set; }
public DateTime Created { get; set; }
public virtual Topic Topic { get; set; }
public virtual Member WhoIs { get; set; }
public virtual Province Province { get; set; }
public virtual Town Town { get; set; }
public virtual District District { get; set; }
public virtual Reeve Reeve { get; set; }
As you see I have Reeve as a virtual table.When I create table I get Reeve_Id and Trying to .GroupBy(m => m.Reeve.Id) So here is the code ;
public ActionResult GroupByReeve()
{
var model = new ProblemModel
{
ProblemsList = Db.Problems.GroupBy(m => m.Reeve.Id)
.Select(s => new ProblemModel.ProblemForView
{
Id = s.FirstOrDefault().Id,
CountItem = s.Count(),
AllItem = Db.Problems.Count(),
ReeveName=s.FirstOrDefault().Reeve.Name
})
};
return View(model);
}
So I can groupby problems by their Id not by ReeveId.The view returns 4 items(4 problems) But they are belong to only 2 Reeves So it must show 2 items not 4 items. How can I do it ?

Answer 1

I'm not sure, why your code doesn't work (it looks like it should), but here is how you use GroupBy properly:
ProblemsList = Db.Problems.GroupBy(m => m.Reeve.Id,
s => new ProblemModel.ProblemForView
{
Id = s.FirstOrDefault().Id,
CountItem = s.Count(),
AllItem = Db.Problems.Count(),
ReeveName=s.FirstOrDefault().Reeve.Name
});