Configure a one-to-one relation with some seed data for a owned type

[remus-corneliu]

Is it something that I'm missing in my configuraiton ?

I want to configure a one-to-one relation with some seed data for a owned type.

I've tried the following but with no success

Following is my code.

public class Beneficiary
{
    public long Id { get; set; }

    public string Name { get; set; }
}

public class BeneficiaryInvoice
{
    public string Number { get; set; }

    public DateTime IssueDate { get; set; }

    public BeneficiaryInvoice Invoice { get; set; }
}

    void IEntityTypeConfiguration<Beneficiary>.Configure(EntityTypeBuilder<Beneficiary> builder)
    {
        builder.HasKey(pk => pk.Id);

        builder.Property(pk => pk.Id)
            .UseIdentityColumn()
            .ValueGeneratedOnAdd();

        builder.Property(self => self.Name)
            .HasMaxLength(512)
            .IsRequired();

        builder
            .OwnsOne(self => self.Invoice,
                nav =>
                {
                    nav.ToTable("Invoices");
                    nav.Property(nav => nav.Number).HasMaxLength(16).IsRequired();
                    nav.Property(nav => nav.IssueDate).HasDefaultValueSql("getutcdate()");
                })
            .HasData(new
            {
                Id = (long)-1,
                IssueDate = DateTime.UtcNow,
                Number = "004"
            });

        builder
            .Navigation(self => self.Invoice)
            .IsRequired();

        builder.HasData(
            new Beneficiary
            {
                Id = -1,
                Name = "abc",                    
            });
    }

The seed entity for entity type 'Beneficiary' cannot be added because no value was provided for the required property 'Name'.

Whic I don't know why it complains about because I clearly set the name property value.

If however I make the name as optional by setting isRequired to false (but it needs to be required)

The seed entity for entity type 'Beneficiary' cannot be added because another seed entity with the key value 'Id:-1' has already been added.

I don't understand what I'm missing.

EF Core version: "5"

Database provider: SqlServer

PackageReferences:

• Microsoft.EntityFrameworkCore, version :5.0.9
• Microsoft.EntityFrameworkCore.SqlServer, version :5.0.9

Target: dotnet Core 5

Operating system: Windows

IDE: Visual Studio 2019