Question

We’ve been using a complex type CreditCardTransaction associated with our purchase orders. It really should have been it’s own entity, and I am trying to fix this now.

How would you write a migration from this:

[ComplexType()]
public class CreditCardTransaction
{
    public String SomeTransactionData { get; set; }
}

into this entity:

public class CreditCardTransaction
{
    public int Id { get; set; }
    public String SomeTransactionData { get; set; }
}

This is what is generated for me. Can I easily move the data in the original table to the other table?

public partial class test : DbMigration
{
    public override void Up()
    {
        CreateTable(
            "CreditCardTransactions",
            c => new
                {
                    Id = c.Int(nullable: false, identity: true),
                    SomeTransactionData = c.String()
                })
            .PrimaryKey(t => t.Id);

        AddColumn("PurchaseOrder", "Transaction_Id", c => c.Int());
        AddForeignKey("PurchaseOrder", "Transaction_Id", "CreditCardTransactions", "Id");
        CreateIndex("PurchaseOrders", "Transaction_Id");
        DropColumn("PurchaseOrders", "Transaction_SomeTransactionData");
    }

    // Down() snipped
}

Answer 1

I believe you can. Modify your Up method and prior to call DropColumn use Sql method with custom SQL transferring data from PurchaseOrders to CreditTransactions and fixing FK relationships.