Entity Framework 4.1 : The navigation property 'BusinessUser' declared on type 'Login' has been configured with conflicting multiplicities - entity-framework

Question

I am having two entities
BusinessUser { Id(PK), Name,...}
Login { BusinessUserID(PK, FK), Email, Password, etc...}
Relationship between BusinessUser and Login is one-to-zero/one.
I am having following configurations
In BusinessUser EF configuration class
this.HasOptional(bu => bu.LoginInfo)
.WithOptionalPrincipal(l => l.BusinessUser);
In Login EF configuration class
this.HasRequired(l => l.BusinessUser)
.WithOptional(bu => bu.LoginInfo);
I am getting following exception
The navigation property 'BusinessUser' declared on type 'Login' has been configured
with conflicting multiplicities.
Where I am wrong with my one-to-one/zero configuration in EF 4.1 code first.
Update 1 : Following are my class structure
public class BusinessUser {
public virtual int ID { get; set; }
public virtual int BusinessID { get; set; }
public virtual Business Business { get; set; }
public Login LoginInfo { get; set; }
}
public class Login {
public virtual int BusinessUserID { get; set; }
public virtual string Email { get; set; }
public virtual string Password { get; set; }
public BUsinessUser BusinessUserInfo { get; set; }
}
Also I am looking for bi-directional.

Answer 1

Your BusinessUser must have relation configured as:
this.HasOptional(bu => bu.LoginInfo)
.WithRequired(l => l.BusinessUser);
Both configuration must be same (actually only one is needed) and the first configuration is incorrect because it is trying to define 0..1 - 0..1 relation.

Answer 2

How have you structured your classes ? Here's a sample with a relationship one-to-one/zero defined.
The result is :
BusinessUser { Id(PK), Name,...}
Login { BusinessUserID(PK, FK), Email, Password, etc...}
public class BusinessUser
{
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int Id { get; set; }
public string Name { get; set; }
public string Email { get; set; }
public virtual LoginInfo LoginInfo { get; set; }
}
public class LoginInfo
{
public int BusinessUserId { get; set; }
public virtual BusinessUser BusinessUser { get; set; }
public string Username { get; set; }
public string Password { get; set; }
}
Here is the DbContext and the Initializer
public class MyContext : DbContext
{
public DbSet<BusinessUser> BusinessUsers { get; set; }
public DbSet<LoginInfo> LoginInfos { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
//We define the key for the LoginInfo table
modelBuilder.Entity<LoginInfo>().HasKey(x => x.BusinessUserId);
modelBuilder.Entity<LoginInfo>().HasRequired(bu => bu.BusinessUser);
}
}
public class MyInitializer : DropCreateDatabaseIfModelChanges<MyContext>
{
protected override void Seed(MyContext context)
{
var businessUser = new BusinessUser();
businessUser.Email = "mymail#email.com";
businessUser.Name = "My Name";
businessUser.LoginInfo = new LoginInfo(){Username = "myusername", Password ="mypassword"};
context.BusinessUsers.Add(businessUser);
context.SaveChanges();
}
}