Primary Key Violation: Inheritance using EF Code First

Question

I have following EF code first code. I am getting the following exception:

\'GiftCouponPayment\' does not contain an identity column.

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Answer 1

You are not specifying the ID field for your TPC / TPT mappings. Even with inheritance you need to do this when not running a TPH mappings. (To note, I'm also not sure on the MapInheritedProperties() call... This is generally used for TPH... not TPT)

 //Fluent API - Table per Concrete Type (TPC)
 modelbuilder.Entity()
      .HasKey(x => x.PaymentComponentID)
      .Map(m =>
      {
          m.MapInheritedProperties();
          m.ToTable("GiftCouponPayment");
      })
      .Property(x => x.PaymentComponentID)
      .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);

This needs to be on each and every class mapping from the concrete type. If it were me I would go with TPH mapping where GiftCoupon as well as the other inheritance mapping so you end up with 1 table to represent the entire tree of objects using a discriminator column.

Regardless... The other thing you are missing in your base class is:

public byte[] Version { get; set; }

And the associated mapping for:

Property(x => x.Version).IsConcurrencyToken()

Which allows for optimistic concurrency.

Hopefully this helps a bit, let me know if you need further assistance or clarification.