How can I avoid ASP.NET Identity from adding this extra field? - ef-code-first

Question

I have a new MVC5 project with ASP.NET Identity 2.0 and EF 6.1.1.
I added my own ApplicationUser (based on built-in IdentityUser). This is how my DbContext is created.
public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
public ApplicationDbContext()
: base("DefaultConnection", throwIfV1Schema: false)
{
}
public static ApplicationDbContext Create()
{
return new ApplicationDbContext();
}
}
When the database is created I have tables like AspNetUsers, AspNetUserRoles, AspNetUserClaims, and AspNetUserLogins. Then I added OnModelCreating() with just the most basic statements.
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<IdentityUserLogin>().HasKey<string>(l => l.UserId);
modelBuilder.Entity<IdentityUserRole>().HasKey(r => new { r.RoleId, r.UserId });
}
As soon as I add OnModelCreating(), the identity tables are automatically renamed to ApplicationUsers, IdentityUserRoles, IdentityUserClaims, and IdentityUserLogins. That's fine with me (and I know how to rename them).
But what I don't like: All of a sudden, IdentityUserRoles, IdentityUserClaims, and IdentityUserLogins have an extra field called "ApplicationUser_Id". The original "AspNetXXX" tables didn't have such a field.
Why is that? And is there anything I can do in order to avoid this?

Answer 1

You need to call base.OnModelCreating. There are a number of additional things OnModelCreating does in IdentityDbContext that you may be missing without calling it - the default names of the tables being one of them.
Its best to call it first, then apply your own changes afterwards.

Answer 2

As mentioned by Matt Lassam-Jones
worked for me also and Thank You.
public class NebulaContext : IdentityDbContext<ApplicationUser>
{
public NebulaContext()
: base("Name=MyEntity", throwIfV1Schema: false)
{
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Conventions.Remove<PluralizingTableNameConvention>(); //Optional
modelBuilder.Conventions.Remove<ManyToManyCascadeDeleteConvention>();//Optional
modelBuilder.Conventions.Remove<OneToManyCascadeDeleteConvention>(); //Optional
base.OnModelCreating(modelBuilder);
}
}