Empty assosiated entities in EF 6.0 Fluent Api - sql

Question

I try to implement 1..0 relations with Entity Framework 6. I use instance associsaltion. I try to repeat the examples from web and forums but somehow it doesn't work for me. Please, help.
Entities:
public class CustomerWithFk : Item // Item contains Id
{
public string Name { get; protected set; }
public virtual City City { get; set; } // relation property. Can be 1 or 0
public virtual Product Product { get; set; }
public decimal Money { get; protected set; }
}
public class City : Item
{
public string Name { get; protected set; }
}
Mappings:
public CityMap()
{
ToTable("Cities");
HasKey(c => c.Id);
}
public CustomerFkAssosiationMap()
{
ToTable("Customers");
HasKey(c => c.Id);
HasRequired(g => g.City)
.WithRequiredDependent();
HasRequired(g => g.Product)
.WithRequiredDependent()
.Map(x => x.MapKey("ProductId"));
}
Database tables:
SQL Profiler gives me enxt SQL request:
SELECT
1 AS [C1],
[Extent1].[Id] AS [Id],
[Extent1].[Name] AS [Name],
[Extent1].[Money] AS [Money],
[Extent1].[CityId] AS [CityId],
[Extent1].[ProductId] AS [ProductId]
FROM [dbo].[Customers] AS [Extent1]
So, I don't see any joins here to load data from Cities or Products.
And the result is Null:
I tried different mapping options, like: HasOptional, WithRequiredPrincipal, tried to add Customers proeprty to City (while it's incorrect and City doesn't have to know something about customers)
Nothing helps. The assosiated entities are always null.
Where am I wrong?

Answer 1

The problem is that you are not including the related objects. Try something like this using Include:
var list = context.CustomerWithFk
.Include("City")
.Include("Product");
That tells Entity Framework that you want to pull back the customer along with the city and product. Here is some further reading if you are interested: http://msdn.microsoft.com/en-us/data/jj574232.aspx.
EDIT: You could also enable lazy loading (based on your comment I believe it is what you are after) by adding this to your context:
context.ContextOptions.LazyLoadingEnabled = true;
Read more about lazy loading here: http://msdn.microsoft.com/en-us/library/vstudio/dd456846(v=vs.100).aspx.