Entity Framework Code Only Relationship Not Being Read - entity-framework

Question

(This looks like a long question, but it's not really, honest!)
I am trying to get a simple proof of concept working with Entity Framework 4 and the CTP 3 version of Code Only. It feels like I'm missing something really obvious and simple.
I have this following test which is failing:
[TestFixture]
public class ParentChildTests
{
[Test]
public void ChildRead_DatabaseContainsRelatedObjects_ParentIsNotNull()
{
var ctx = GetMyObjectContext();
var child = ctx.Children.Where(c => c.Id == 1).Single();
var parent = child.ParentTable;
Assert.That(parent, Is.Not.Null);
}
// GetMyObjectContext etc...
}
The read of child works fine and I get back a ChildTable whose ParentTableId value is '1' as I would expect, but the ParentTable property is NULL. I do not expect this because my POCOs have all virtual properties (see below) and EF4 has lazy loading enabled by default.
What am I missing?
Database
create table parent_table
(
parent_table_id int identity(1,1) primary key,
parent_table_name varchar(50) not null,
display_name varchar(50)
)
create table child_table
(
child_table_id int identity(1,1) primary key,
child_table_name varchar(50) not null,
parent_table_id int not null
)
alter table child_table add constraint FK_child_table__parent_table
foreign key (parent_table_id) references parent_table(parent_table_id)
POCO Entities
public class ParentTable
{
public virtual int Id { get; set; }
public virtual string Name { get; set; }
public virtual string DisplayName { get; set; }
}
public class ChildTable
{
public virtual int Id { get; set; }
public virtual string Name { get; set; }
public virtual int ParentTableId { get; set; }
public virtual ParentTable ParentTable { get; set; }
}
Entity Configurations
public class ParentTableConfiguration : EntityConfiguration<ParentTable>
{
public ParentTableConfiguration()
{
MapSingleType(pt => new
{
parent_table_id = pt.Id,
parent_table_name = pt.Name,
display_name = pt.DisplayName,
})
.ToTable("dbo.parent_table");
Property( pt => pt.Id ).IsIdentity();
Property( pt => pt.Name ).IsRequired();
}
}
public class ChildTableConfiguration : EntityConfiguration<ChildTable>
{
public ChildTableConfiguration()
{
MapSingleType(ct => new
{
child_table_id = ct.Id,
child_table_name = ct.Name,
parent_table_id = ct.ParentTableId,
})
.ToTable("dbo.child_table");
Property( ct => ct.Id ).IsIdentity();
Property( ct => ct.Name ).IsRequired();
Relationship(ct => ct.ParentTable)
.HasConstraint((ct, pt) => ct.ParentTableId == pt.Id);
}
}
(Thanks for reading this far!)

Answer 1

As far as understand you just do not load this navigation property.
This will result in eager loading.
var child = ctx.Children.Include("ParentTable").Where(c => c.Id == 1).Single();
Or you could enable lazy loading by setting ctx.ContextOptions.LazyLoadingEnabled = true;