Flatten/expand columns of Navigation Property for ViewModel?
class Employee
{
  [Key]
  public int EmployeeKey {get;set;}

  public string EmployeeName { get; set; }

  public int CurrentEmployeeChangeKey { get; set; }
  [ForeignKey("CurrentEmployeeChangeKey")]
  public virtual EmployeeChange CurrentEmployeeChange {
    get { return EmployeeChanges.FirstOrDefault() ; } /*set;*/ }

  public virtual ICollection<EmployeeChange> EmployeeChanges { get; set; }
}

class EmployeeChange
{
   [Key]
   public int EmployeeChangeKey { get; set; }

   public int EmployeeKey { get; set; }
   [ForeignKey("EmployeeKey")]
   public virtual Employee Employee { get; set; }


   public string EmployeeStreet { get; set; }
   public string EmployeeCity { get; set; }
   public string Etc { get; set; }

   public DateTime ChangeEffective { get; set; }

}

class EmployeeCurrentChange
{
   public string EmployeeName { get; set; }
   public string EmployeeStreet { get; set; }
   public string EmployeeCity { get; set; }
   public string Etc { get; set; }

   public DateTime ChangeEffective { get; set; }

//I don't need the below properties in the result, but if they
//happen to be there I don't mind.
   public int EmployeeKey { get; set; }
   [ForeignKey("EmployeeKey")]
   public virtual Employee Employee { get; set; }

   [Key]
   public int EmployeeKey {get;set;}

   public int CurrentEmployeeChangeKey { get; set; }
   [ForeignKey("CurrentEmployeeChangeKey")]
   public virtual EmployeeChange CurrentEmployeeChange {
     get { return EmployeeChanges.FirstOrDefault() ; } /*set;*/ }

   public virtual ICollection<EmployeeChange> EmployeeChanges { get; set; }

   [Key]
   public int EmployeeChangeKey { get; set; }

}