Can't access to foreign key properties using Entity Framework in Razor Pages project - entity-framework-core

Question

I'm trying to display foreign key properties values using class that should have access to it:
#foreach (var item in Model.UserIssues)
{
<div class="card scroll" style="width:22rem;">
<div class="card-header p-4">
<div class="d-flex justify-content-between">
<div>
<p class="card-label mb-0"></p>
<h5>#Html.DisplayFor(i => item.Case.CaseNumber)</h5>
</div>
<div>
<a class="btn button-idle-add" data-bs-toggle="tooltip" data-bs-title="Dodaj Pracownię" asp-route-id="#item.Id" asp-page="/Cases/AddLaboratory"><i class="fa-solid fa-plus"></i></a>
</div>
</div>
<div class="d-flex justify-content-between mt-3">
<div>
<p class="card-input">#Html.DisplayFor(e => item.Case.Principal)</p>
</div>
<div>
<p class="card-input">#Html.DisplayFor(e => item.Case.Date)</p>
</div>
</div>
</div>
<div class="card-body">
<div class="m-1 p-3 card-lab">
<div class="d-flex justify-content-between align-items-center">
<p>#Html.DisplayFor(e => item.IssueNumber)</p>
<p class="pe-3 ps-3" style="border-radius:15px; background-color: palegreen;"></p>
</div>
<p>#Html.DisplayFor(e => item.Specialist.Laboratory)</p>
<p>#Html.DisplayFor(e => item.Specialist.FullName)</p>
</div>
</div>
</div>
}
public class IndexModel : PageModel
{
private readonly IRepository<Issue> issueRepository;
private readonly IRepository<Specialist> specialistRepository;
public IndexModel(IRepository<Issue> issueRepository, IRepository<Specialist> specialistRepository)
{
this.issueRepository = issueRepository;
this.specialistRepository = specialistRepository;
}
public List<Issue> AllIssues { get; set; }
public async Task<IActionResult> OnGetAsync()
{
var loggedUser = specialistRepository.GetAll().FirstOrDefault(u => u.Login == User.Identity.Name);
UserIssues = issueRepository.GetAll().Where(i => i.Specialist.Id == loggedUser.Id).ToList();
return Page();
}
}
So for Specialist it works just fine:
#Html.DisplayFor(e => item.Specialist.FullName)
But for the Case it doesn't work, nothing is displayed:
#Html.DisplayFor(i => item.Case.CaseNumber)
Here are my models for Entity Framework setup:
public class Case
{
[Key]
public int Id { get; set; }
[Required(ErrorMessage = "Uzupełnij pole")]
public string CaseNumber { get; set; }
[Required(ErrorMessage = "Uzupełnij pole")]
public string Principal { get; set; }
[Required(ErrorMessage = "Uzupełnij pole")]
public string Description { get; set; }
[Required(ErrorMessage = "Uzupełnij pole")]
public string Date { get; set; }
public ICollection<Issue> Issues { get; set; }
}
public class Issue
{
[Key]
public int Id { get; set; }
public string Comment { get; set; }
[Required(ErrorMessage = "Uzupełnij pole")]
public string IssueNumber { get; set; }
public Case Case { get; set; }
public Specialist Specialist { get; set; }
}
public class Specialist : IdentityUser
{
[Required]
public string Login { get; set; }
[Required]
public string FirstName { get; set; }
[Required]
public string LastName { get; set; }
[Required]
public string Laboratory { get; set; }
public string FullName
{
get
{
return FirstName + " " + LastName;
}
}
public ICollection<Issue> Issues { get; set; }
}
Is my Entity Framework setup wrong? How can I display property values for the Case entity?

Answer 1

Using Entity Framework in case you want to get a specialist with id e775704b-5298-4173-82c8-c15d884e0695 and include the issues for this specialist you can use the include method in order to get the associated data.
Specialist? specialist = context.Specialists.Where(m => m.Id == "e775704b-5298-4173-82c8-c15d884e0695").Include(m => m.Issues).FirstOrDefault();
if (specialist != null)
{
foreach (var issue in specialist.Issues)
{
string issueNumber = issue.IssueNumber;
}
}
You can do the same thing for the entire list like this.
List<Specialist> specialists = context.Specialists.Include(m => m.Issues).ToList();
foreach (var specialist in specialists)
{
foreach (var issue in specialist.Issues)
{
string issueNumber = issue.IssueNumber;
}
}