How to include existing tables into MVC5 IdentityModeld.cs ApplicationDbContext and disable migrations?

Question

Bellow my MVC5 App IdentityModeld.cs:

public class ApplicationUser : IdentityUser {
    public int StaffId { get; set; }
}

//public class ApplicationDbContext : 
//IdentityDbContext<User, UserClaim, UserSecret, UserLogin, Role, UserRole> {
//original: http://www.briankeating.net/?tag=/IdentityDbContext
public class ApplicationDbContext : IdentityDbContext<ApplicationUser> {

    public ApplicationDbContext() : base("DefaultConnection") {
        //Database.SetInitializer<ApplicationDbContext>(null);
        //Configuration.AutoDetectChangesEnabled = false;
    }

    protected override void OnModelCreating(DbModelBuilder modelBuilder) {
        //modelBuilder.Ignore<Staff>();
        //base.OnModelCreating(modelBuilder);
    }

    // dublicate from another DbContext
    //public DbSet<Staff> Person { get; set; }
} 

Commented lines cause error:

The model backing the 'ApplicationDbContext' context has changed since the database was created...

I don't need migrations. There are no changes in my database or models. Can I add to existing ApplicationDbContext existing table from database as is? There is no __MigrationHistory table in my database.

Answer 1

You need to update the shema stored "inside EF" to the current one by adding an empty migration.
Execute the following in the Package Manager Console:

Add-Migration Initial -IgnoreChanges

This should create a new migration with the updated shema for EF, but an empty Up and Down method.