Relationships (One to One) in EF 4.0

Question

Hello,

i hava a question about relationships in Beta 2 with Code Only Model. How to specify a one to one
relationship? E.g. i have two tables / classes "Person" and "PersonAddress".

public class Person
{
  public PersonId { get; set; }
  public string FirstName { get; set; }
  public string LastName { get; set; }
  public PersonAddress Address { get; set; }
}

public class PersonAddress
{
  public PersonAddressId { get; set; }
  public string Street { get; set ; }
  // ...
}

The "PersonAddress" is nullable in "Person".
So, how to specify the mapping for the class "Person"?

public PersonMap()
{
   MapSingleType(p => new
      {
        PersonID = p.PersonId,
        FirstName = p.FirstName,
        LastName = p.LastName,
        PersonAddressID = // p.Address?? or p.Address.PersonAddressId??
      }).ToTable("dbo.Persons");

    HasKey(p => p.PersonId);
           
    Relationship(//???
}

Can someone give an advise?

Answer 1

You want PersonAddressID = p.Address.PersonAddressId.

This may be useful:
http://blogs.msdn.com/efdesign/archive/2009/08/03/code-only-enhancements.aspx

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