Changed exceptions, added action for closing applications by applicant

SchengenVisaApi/Infrastructure/Database/VisaApplications/Repositories/VisaApplicationsRepository.cs

@@ -1,6 +1,7 @@
 using ApplicationLayer.Services.VisaApplications.NeededServices;
 using Domains.VisaApplicationDomain;
 using Infrastructure.Database.Generic;
+using Infrastructure.Database.VisaApplications.Repositories.Exceptions;
 using Microsoft.EntityFrameworkCore;
 
 namespace Infrastructure.Database.VisaApplications.Repositories;
@@ -16,4 +17,14 @@ public sealed class VisaApplicationsRepository(IGenericReader reader, IGenericWr
 
     async Task<List<VisaApplication>> IVisaApplicationsRepository.GetOfApplicantAsync(Guid applicantId, CancellationToken cancellationToken)
         => await LoadDomain().Where(va => va.ApplicantId == applicantId).ToListAsync(cancellationToken);
+
+    async Task<VisaApplication> IVisaApplicationsRepository.GetByApplicantAndApplicationIdAsync(
+        Guid applicantId,
+        Guid applicationId,
+        CancellationToken cancellationToken)
+    {
+        var result = await LoadDomain()
+            .SingleOrDefaultAsync(va => va.Id == applicationId && va.ApplicantId == applicantId, cancellationToken);
+        return result ?? throw new ApplicationNotFoundByApplicantAndApplicationIdException(applicationId);
+    }
 }