User in Entity type MVC5 EF6

I have created a class in MVC5, where I want a primary owner of the content and then I want to have some editors for the content:

public class Content
{
    public int ID { get; set; }
    public IdentityUser Owner { get; set; }
    public ICollection<IdentityUser> Editors { get; set; }
    public string Title{ get; set; }
    public string Body { get; set; }
}

In the database context I have the following code:

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    base.OnModelCreating(modelBuilder);

    modelBuilder.Entity<Content>()
        .HasOptional(c => c.Editors)
        .WithRequired()
        .WillCascadeOnDelete();

    modelBuilder.Entity<Content>()
        .HasRequired(c => c.Owner)
        .WithOptional()
        .WillCascadeOnDelete();
}

I would expect Microsoft to have implemented the IdentityUser object in such a way, that it can be used in other entity types, so I am probably doing something wrong, because when I try to make a controller for the Content entity type, I get the following error:

EntityType 'IdentityUserLogin' has no key defined
EntityType 'IdentityUserRole' has no key defined
EntityType: EntitySet 'IdentityUserLogins' is based on type 'IdentityUserLogin' that has no key defined
EntityType: EntitySet 'IdentityUserRoles' is based on type 'IdentityUserRole' that has no key defined

I have also tried to add the following code to the ApplicationDbContext as described in this question Map tables using fluent api in asp.net MVC5 EF6?:

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    base.OnModelCreating(modelBuilder);
    modelBuilder.Entity<IdentityUserLogin>().HasKey<string>(l => l.UserId);
    modelBuilder.Entity<IdentityRole>().HasKey<string>(r => r.Id);
    modelBuilder.Entity<IdentityUserRole>().HasKey(r => new { r.RoleId, r.UserId });
}

I must be doing something wrong. Please tell me how I can handle users in my Content EntityType.

Answers:

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Method 1

I had the same problem and I found that I had not called

 base.OnModelCreating(modelBuilder);

in my DbModel

Method 2

The following method, OnModelCreating, will create a working context. Not sure if it is the mapping you want though.

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    base.OnModelCreating(modelBuilder);

    modelBuilder.Entity<Content>()
        .HasMany(c => c.Editors)
        .WithOptional()
        .WillCascadeOnDelete(false);

    modelBuilder.Entity<Content>()
        .HasRequired(c => c.Owner)
        .WithOptional()
        .WillCascadeOnDelete(false);

    modelBuilder.Entity<IdentityUserLogin>().HasKey<string>(l => l.UserId);
    modelBuilder.Entity<IdentityRole>().HasKey<string>(r => r.Id);
    modelBuilder.Entity<IdentityUserRole>().HasKey(r => new { r.RoleId, r.UserId });
}

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