EF Core 2.0 Identity - Adding navigation properties

Question

In EF Core 2.0 Identity navigation properties are not included by default, so after upgrading, I added them. So for Many-To-Many relationship between User and Role, and One

Answer 1

I do not know why, there are not these useful navigation properties. I want to list users with their roles.

So I did the follow:

public class ApplicationUser : IdentityUser
{
    public virtual ICollection UserRoles { get; } = new List();
}

public class ApplicationUserRole : IdentityUserRole
{
    public virtual ApplicationUser User { get; set; }
    public virtual ApplicationRole Role { get; set; }
}

public class ApplicationRole : IdentityRole
{
    public ApplicationRole(){ }

    public ApplicationRole(string roleName)
        : base(roleName)
    {
    }

    public virtual ICollection UserRoles { get; } = new List();
}

This creates the navigation, but it creates additional columns like RoleId1 and Discriminator. So, I added the following according to Add IdentityUser POCO Navigation Properties.

protected override void OnModelCreating(ModelBuilder builder)
{
    base.OnModelCreating(builder);

    builder.Entity()
        .HasMany(e => e.UserRoles)
        .WithOne()
        .HasForeignKey(e => e.UserId)
        .IsRequired()
        .OnDelete(DeleteBehavior.Cascade);

    builder.Entity()
        .HasOne(e => e.User)
        .WithMany(e => e.UserRoles)
        .HasForeignKey(e => e.UserId);

    builder.Entity()
        .HasOne(e => e.Role)
        .WithMany(e => e.UserRoles)
        .HasForeignKey(e => e.RoleId);
}

But I still have both columns RoleId1 and Discriminator. After that, I replace with the new ApplicationRole class in ApplicationDbContext, DI configuration service and DB seed.

public class ApplicationDbContext : IdentityDbContext
    , ApplicationUserRole, IdentityUserLogin, IdentityRoleClaim, IdentityUserToken>
{
    ...
}

public void ConfigureServices(IServiceCollection services)
{
   ...
   services.AddIdentity()
            .AddEntityFrameworkStores()
            .AddDefaultTokenProviders();
   ...
}

public DbInitializer(
        ApplicationDbContext context,
        UserManager userManager,
        RoleManager roleManager)
    {
        _context = context;
        _userManager = userManager;
        _roleManager = roleManager;
    }

public async void Initialize()
    {
        _context.Database.EnsureCreated();

        if (!_context.Roles.Any(r => r.Name == SharedConstants.Role.ADMINISTRATOR))
            await _roleManager.CreateAsync(new ApplicationRole(SharedConstants.Role.ADMINISTRATOR));
    }            

Also, I could navigate and get the first name of role.

ctx.Users.Select(e => new
            {
                e.Id,
                e.UserName,
                e.Email,
                e.PhoneNumber,
                Roles = e.UserRoles.Select(i => i.Role.Name).ToList()
            }).ToList();

I hope this give you a clue for Claims navigation property.