EF6: How to make Custom Entity from Multiple Tables - entity-framework

Question

Using the Northwind database, I have generated all of the entities from that table using EF6.
Now I would like to create an additional custom entity, which is not an existing table, but it pulls data from three existing tables. The custom entity is "OrderCustomized".
public class OrderCustomized
{
public int OrderID { get; set; }
public DateTime? OrderDate { get; set; }
public string CustomerID { get; set; }
public string CustomerContactName { get; set; }
public string CustomerPhone { get; set; }
public int? EmployeeID { get; set; }
public string EmployeeLastName { get; set; }
public string EmployeeFirstName { get; set; }
}
public partial class NorthwindEntities : DbContext
{
public NorthwindEntities()
: base("name=NorthwindEntities")
{
this.Configuration.LazyLoadingEnabled = false;
this.Configuration.ProxyCreationEnabled = false;
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
//throw new UnintentionalCodeFirstException();
modelBuilder.Entity<OrderCustomized>()
.Map(m =>
{
m.Properties(o => new { o.OrderID, o.OrderDate, o.CustomerID, o.EmployeeID });
m.ToTable("Order");
})
.Map(m =>
{
m.Properties(c => new { c.CustomerID, c.CustomerContactName, c.CustomerPhone });
m.ToTable("Customer");
})
.Map(m =>
{
m.Properties(e => new { e.EmployeeID, e.EmployeeLastName, e.EmployeeFirstName });
m.ToTable("Employee");
})
;
base.OnModelCreating(modelBuilder);
}
public virtual DbSet<Category> Categories { get; set; }
public virtual DbSet<Contact> Contacts { get; set; }
public virtual DbSet<CustomerDemographic> CustomerDemographics { get; set; }
public virtual DbSet<Customer> Customers { get; set; }
public virtual DbSet<Employee> Employees { get; set; }
public virtual DbSet<Order_Detail> Order_Details { get; set; }
public virtual DbSet<Order> Orders { get; set; }
public virtual DbSet<Product> Products { get; set; }
public virtual DbSet<Region> Regions { get; set; }
public virtual DbSet<Shipper> Shippers { get; set; }
public virtual DbSet<Supplier> Suppliers { get; set; }
public virtual DbSet<Territory> Territories { get; set; }
public virtual DbSet<OrderCustomized> OrdersCustomized { get; set; }
}
I keep getting the error "The entity type OrderCustomized is not part of the model for the current context."
How do I made OrderCustomized part of the model for the current context?
I would really appreciate any sample code, as I cannot find any when searching the internet.
Thanks,
Kellie

Answer 1

Remember to update T4 file (.tt extension). Let me know does it work after that operation.