How to code Entity Framework programmable migrations

context.md

see https://www.industrialcuriosity.com/2017/04/how-to-code-entity-framework.html for context

MigrationsList.json

[
  "201704230706451_AutomaticMigration",
  "201704230705538_AutomaticMigration"
]

Migrator.cs

var configuration = new DbMigrationsConfiguration<Models.MyDBContext>();
configuration.ContextType = typeof(Models.MyDBContext);
configuration.ContextKey = "MyNamespace.Migrations.Configuration";
configuration.TargetDatabase = new DbConnectionInfo(connectionString, "System.Data.SqlClient");
configuration.AutomaticMigrationsEnabled = true;
configuration.AutomaticMigrationDataLossAllowed = true;

var migrator = new DbMigrator(configuration);
migrator.Update();

MigratorUpdateExample.cs

migrator.Update("201704230705538_AutomaticMigration");

MyDbContext.cs

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
  // allow db calls to work when db migrations not up to date
  Database.SetInitializer<MyDBContext>(null);

  base.OnModelCreating(modelBuilder);

  //...
 }

Seed.cs

public sealed partial class Configuration : DbMigrationsConfiguration<MyDBContext> {

  /// <summary>
  /// this method allows us to programmatically seed the database, use instead of
  ///       protected override void Seed(Models.MyDBContext context)
  /// which is for the update-database command (which we should never use)
  /// </summary>
  public void SeedProgrammatically(
  {
    Seed(context);
  }