Violation of PRIMARY KEY constraint 'PK_Currencies'. Cannot insert duplicate key in object - sql-server

Question

I am working on blazor server. I have the following class structure for my project.
I have for this error three classes.
ApplicationUser class:
public class ApplicationUser
{
public Guid ApplicationUserID { get; set; }
[Required (ErrorMessage = "Name is required")]
public string Name { get; set; } = null!;
[Required(ErrorMessage = "Surname is required")]
public string Surname { get; set; } = null!;
[Required(ErrorMessage = "Email is required")]
public string Email { get; set; } = null!;
[Required(ErrorMessage = "Password is required")]
public string Password { get; set; } = null!;
[Required(ErrorMessage = "Salary pay date is required")]
public DateTime? SalaryPaymentDate { get; set; }
[Required(ErrorMessage = "Salary amount is required")]
public Decimal? SalaryAmount { get; set; }
[Required (ErrorMessage = "Currency is required")]
public Guid? CurrencyID { get; set; }
public Currency? Currency { get; set; }
public List<CreditCard>? CreditCards { get; set;}
public List<Saving>? Savings { get; set;}
public List<Expense>? Expenses { get; set;}
}
Currency class:
public class Currency
{
public Guid CurrencyID { get; set; }
public string CurrencyName { get; set; } = null!;
public string CurrencyAbbreviation { get; set; } = null!;
public string? CurrencySymbol { get; set; }
public List<ApplicationUser>? ApplicationUsers { get; set; }
}
I seeded the currency class with three values namely:
- USD
- ZAR
- Euro
`Savings` class:
public class Saving
{
public Guid SavingID { get; set; }
public List<Goal>? Goals { get; set; }
public Guid? ApplicationUserID { get; set; }
public ApplicationUser? ApplicationUser { get; set; }
}
So what I am trying to do is when you open the savings view for the first time and the Get method returns 0 values I create a new SavingObject.
In this SavingObject, I assign the CurrentUser which is passed as a cascading parameter and it does have a value.
Then I run my AddMethod to create the saving object. Here is the method:
[CascadingParameter]
public ApplicationUser? CurrentUser { get; set; }
protected override async Task OnInitializedAsync()
{
Savings = await savingsservice.Get();
if (Savings?.Count > 0)
SavingObject = Savings.FirstOrDefault();
else
{
SavingObject = new Saving();
SavingObject.ApplicationUser = CurrentUser!;
SavingObject.ApplicationUserID = CurrentUser!.ApplicationUserID;
await savingsservice.Add(SavingObject);
DataChanged();
}
Goals = await goalsservice.Get();
}
But it then crashes with the following message once the add method is run:
Microsoft.EntityFrameworkCore.DbUpdateException: An error occurred while saving the entity changes. See the inner exception for details.
Microsoft.Data.SqlClient.SqlException (0x80131904): Violation of PRIMARY KEY constraint 'PK_Currencies'. Cannot insert duplicate key in object 'dbo.Currencies'. The duplicate key value is (c80b1fe5-7d94-4fc5-8328-706db7f29a18).
Violation of PRIMARY KEY constraint 'PK_ApplicationUsers'. Cannot insert duplicate key in object 'dbo.ApplicationUsers'. The duplicate key value is (1d03c731-3034-498b-fef5-08db0eaad3f6).
I understand that it states cannot insert duplicate key for the user and currency but why does it want to insert a duplicate key I don't understand because I am assigning the user so it already has the ID and the CurrencyID?
Also my Savings table is empty and I only have one applicationUser in my table which has one Currency.
Can someone please assist as I can't find any answer online.
I have googled the problem but I can't find my specific problem online therefore I am creating a question.
I have also setup the dbcontext as I thought this might have been the problem.
modelBuilder.Entity<ApplicationUser>()
.HasMany(a => a.Savings)
.WithOne(a => a.ApplicationUser)
.HasForeignKey(a => a.ApplicationUserID)
.OnDelete(DeleteBehavior.Cascade);
modelBuilder.Entity<ApplicationUser>()
.HasMany(a => a.CreditCards)
.WithOne(a => a.ApplicationUser)
.HasForeignKey(a => a.ApplicationUserID)
.OnDelete(DeleteBehavior.Cascade);
modelBuilder.Entity<ApplicationUser>()
.HasMany(a => a.Expenses)
.WithOne(a => a.ApplicationUser)
.HasForeignKey(a => a.ApplicationUserID)
.OnDelete(DeleteBehavior.Cascade);
Here is my Savings.cs service:
namespace MoneyTracker.Services
{
public interface ISavingsService
{
Task<List<Saving>> Get();
Task<Saving> Get(Guid id);
Task<Saving> Add(Saving Saving);
Task<Saving> Update(Saving Saving);
Task<Saving> Delete(Guid id);
void DetachEntity(Saving Saving);
}
public class SavingsService : ISavingsService
{
private readonly ApplicationDbContext _context;
public SavingsService(ApplicationDbContext context)
{
_context = context;
}
public async Task<List<Saving>> Get()
{
return await _context.Savings
.Include(a => a.Goals)
.AsSplitQuery()
.ToListAsync();
}
public async Task<Saving> Get(Guid id)
{
var Saving = await _context.Savings.FindAsync(id);
return Saving;
}
public async Task<Saving> Add(Saving Saving)
{
_context.Savings.Add(Saving);
await _context.SaveChangesAsync();
return Saving;
}
public async Task<Saving> Update(Saving Saving)
{
_context.Entry(Saving).State = EntityState.Modified;
await _context.SaveChangesAsync();
return Saving;
}
public async Task<Saving> Delete(Guid id)
{
var Saving = await _context.Savings.FindAsync(id);
_context.Savings.Remove(Saving);
await _context.SaveChangesAsync();
return Saving;
}
public void DetachEntity(Saving Saving)
{
_context.Entry(Saving).State = EntityState.Detached;
}
}
}