如何从外键获取值以使用关联值填充列表？

Question

I have the following list in my ViewModel:

public List<Objective> Objectives { get; set; }

I also have the following repository method:

public async Task<List<Objective>> GetAll()
{
    return await _context.Objective.ToListAsync();
}

Finally I have the following method in a service which returns a ViewModel:

public async Task<ObjectivesViewModel> GetViewModel()
{
    var viewModel = new ObjectivesViewModel()
    {
        Objectives = await _objectivesRepository.GetAll()
    };

    return viewModel;
}

All of this works as expected.

My Objective Model looks like this:

public string ReferenceCode { get; set; }
public int TeamId { get; set; }
public string Description { get; set; )

With the TeamId Model looking like this:

public int TeamId { get; set; }
public string TeamName { get; set; }

As it stands, the repository returns all, as it should, however what I'd like to do is to add the TeamName associated with the TeamId. How would I accomplish or approach this?

Answer 1

Make TeamId foreign key, and access team navigation property Objective model:

public string ReferenceCode { get; set; }
public int TeamId { get; set; }
[ForeignKey("TeamId ")]
public Team Team { set; get; }
public string Description { get; set; )

now you can access teamId or teamName

Objective obj = _context.Objective.FirstOrDefault();
obj.Team.TeamName