One to many with applicationuser - asp.net-mvc

Question

If this is a dupp, by all means direct me to the answer.
ASP.NET, MVC5, EF6
Each application user can have many TfsAccountCredentials
IdentityModel.cs has the following:
public class ApplicationUser : IdentityUser
{
public virtual ICollection<TfsAccountCredentials> TfsAccountCredentials { get; set; }
}
TfsAccountCredentials.cs has the following:
public class TfsAccountCredentials
{
public int Id { get; set; }
//other properties
[ForeignKey("ApplicationUserId")]
public virtual ApplicationUser ApplicationUser { get; set; }
public string ApplicationUserId { get; set; }
}
TfsAccountCredentialsDb has the following:
public class TfsAccountCredentialsDb : DbContext
{
public TfsAccountCredentialsDb() : base("DefaultConnection")
{
}
public DbSet<TfsAccountCredentials> TfsAccountCredentials { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.Entity<TfsAccountCredentials>()
.HasRequired(ac => ac.ApplicationUser)
.WithMany(ac => ac.TfsAccountCredentials)
.HasForeignKey(ac => ac.ApplicationUserId);
}
}
IdentityDb.cs has the following:
public class IdentityDb : IdentityDbContext<ApplicationUser>
{
public IdentityDb() : base("DefaultConnection")
{
}
}
Two things. First, when I add a migration using the Identity context, part of the script it generates adds the TfsAccountCredentials table, which already exists due to an earlier migration for the TfsAccountCredentials context.
Second, when I add a migration using the TfsAccountCredentials context, I get the following error:
TfsTeamStatus.Web.DataContexts.IdentityUserLogin: : EntityType 'IdentityUserLogin' has no key defined. Define the key for this EntityType.
TfsTeamStatus.Web.DataContexts.IdentityUserRole: : EntityType 'IdentityUserRole' has no key defined. Define the key for this EntityType.
IdentityUserLogins: EntityType: EntitySet 'IdentityUserLogins' is based on type 'IdentityUserLogin' that has no keys defined.
IdentityUserRoles: EntityType: EntitySet 'IdentityUserRoles' is based on type 'IdentityUserRole' that has no keys defined.
EDIT
My final solution:
IdentityModel.cs contains the following:
public class ApplicationUser : IdentityUser
{
public virtual ICollection<TfsAccountCredentials> TfsAccountCredentials { get; set; }
}
TfsAccountCredentials.cs contains the following:
public class TfsAccountCredentials
{
public int Id { get; set; }
//other properties
[ForeignKey("ApplicationUserId")]
public virtual ApplicationUser ApplicationUser { get; set; }
public string ApplicationUserId { get; set; }
}
ApplicationDb.cs contains the following:
public class ApplicationDb : IdentityDbContext<ApplicationUser>
{
public ApplicationDb() : base("DefaultConnection")
{
}
public DbSet<TfsAccountCredentials> TfsAccountCredentials { get; set; }
}
So TfsAccountCredentialsDb.cs and IdentityDb.cs got combined.

Answer 1

Why you are making to separate DB? I think you want make 2 table in same DB not different DB so remove your TfsAccountCredentialsDb and add your TfsAccountCredentials to IdentityDb:
public class IdentityDb : IdentityDbContext<ApplicationUser>
{
public IdentityDb() : base("DefaultConnection")
{
}
public DbSet<TfsAccountCredentials> TfsAccountCredentials { get; set; }
}

Answer 2

You don't need IdentityDb because IdentityDbContext<ApplicationUser> is the context that handles Identity issues. So then you can either:
A) Have TfsAccountCredentialsDb inherit from IdentityDbContext<ApplicationUser>. This will allow you to reference ApplicationUser in your models. The DbSet for ApplicationUser is in the base class you can't see.
B) If you want TfsAccountCredentialsDb to inherit from DbContext, then you will have to add a copy of ApplicationUser in that context along with it's DbSet that you can use to reference within your app's context.