refactor: attachment associations

src/core/Application/ITMO.Dev.ASAP.Application.Handlers/Users/UpdateUserUniversityIdHandler.cs

@@ -28,7 +28,7 @@ public async Task Handle(Command request, CancellationToken cancellationToken)
 
         if (association is null)
         {
-            association = new IsuUserAssociation(Guid.NewGuid(), user, request.UniversityId);
+            association = IsuUserAssociation.CreateAndAttach(Guid.NewGuid(), user, request.UniversityId);
             _context.UserAssociations.Add(association);
         }
         else

src/core/Domain/ITMO.Dev.ASAP.Domain/UserAssociations/IsuUserAssociation.cs

@@ -4,10 +4,18 @@ namespace ITMO.Dev.ASAP.Domain.UserAssociations;
 
 public partial class IsuUserAssociation : UserAssociation
 {
-    public IsuUserAssociation(Guid id, User user, int universityId) : base(id, user)
+    private IsuUserAssociation(Guid id, User user, int universityId) : base(id, user)
     {
         UniversityId = universityId;
     }
 
     public int UniversityId { get; set; }
+
+    public static IsuUserAssociation CreateAndAttach(Guid id, User user, int universityId)
+    {
+        IsuUserAssociation association = new(id, user, universityId);
+        association.AttachAssociation();
+
+        return association;
+    }
 }

src/core/Domain/ITMO.Dev.ASAP.Domain/UserAssociations/UserAssociation.cs

@@ -8,8 +8,12 @@ public abstract partial class UserAssociation : IEntity<Guid>
     protected UserAssociation(Guid id, User user) : this(id)
     {
         User = user;
-        user.AddAssociation(this);
     }
 
     public virtual User User { get; protected init; }
+
+    protected void AttachAssociation()
+    {
+        User.AddAssociation(this);
+    }
 }

src/core/Infrastructure/ITMO.Dev.ASAP.Seeding/EntityGenerators/UserAssociations/IsuUserAssociationGenerator.cs

@@ -42,7 +42,7 @@ protected override IsuUserAssociation Generate(int index)
         }
 
         int id = _faker.Random.Int(MinIsuNumber, MaxIsuNumber);
-        var association = new IsuUserAssociation(_faker.Random.Guid(), user, id);
+        var association = IsuUserAssociation.CreateAndAttach(_faker.Random.Guid(), user, id);
 
         return association;
     }