Entity Framework: How to avoid Discriminator column from table?

Question

I have the following table created using Entity Framework Code First approach.

1. How do I modify the C# code so that the unwanted Discriminato

Answer 1

TPH inheritance needs special column which is used to identify the type of entity. By default this column is called Discriminator and contains names of derived entities. You can use Fluent-API to define different column name and different values. You can also use your MyType column directly because it is actually a discriminator but in such case you cannot have that column in your entity (column can be mapped only once and if you use it as discriminator it is already considered as mapping).

The name of foreign key column can be again controlled with Fluent-API:

protected override void OnModelCreating(DbModelBuilder modelbuilder)
{
    modelbuilder.Conventions.Remove();

    // Example of controlling TPH iheritance:
    modelBuilder.Entity()
            .Map(m => m.Requires("MyType").HasValue("G"))
            .Map(m => m.Requires("MyType").HasValue("C"));

    // Example of controlling Foreign key:
    modelBuilder.Entity()
                .HasMany(p => p.PaymentComponents)
                .WithRequired()
                .Map(m => m.MapKey("PaymentId"));
}