Govor/Govor.Data/Configurations/AdminConfiguration.cs

using Govor.Core.Models;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Builders;

namespace Govor.Data.Configurations;

public class AdminConfiguration : IEntityTypeConfiguration<Admin>
{
    public void Configure(EntityTypeBuilder<Admin> builder)
    {
        builder.HasKey(a => a.UserId);

        builder.HasOne(a => a.User)
            .WithOne()
            .HasForeignKey<Admin>(a => a.UserId);
    }
}