错误：无法确定类型的组合主键顺序

Question

I try to scaffold a controller for my ClientModel and it gives me an error called:

There was an error running the selected code generator: 'Unable to retrieve metadata for '/////.ClientModel'. Unable to determine composite primary key for ordering for type '/////.ClientModel'. Use the ColumnAttribute (link) or the HasKey method (link) to specify an order for composite primary keys.

I have three classes with all of them an One-To-One relationship with my Client class.

This is my ClientModel:

[Table("Client")]
public class ClientModel : PersonModel
{
    [Key(), DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public Guid ClientId { get; set; }
    [Required]
    public string FirstName { get; set; }
    public string Initials { get; set; }
    [Required]
    public string LastName { get; set; }
    //... snip ...
    [Required]
    public long ClientIdentificationNumber { get; set; }
    public virtual PassportDetailsModel Passport { get; set; }
    public virtual MembershipClientValidationModel Membership { get; set; }
    public virtual AccountClientModel Account { get; set; }
}

Passport class:

[Table("Passport")]
public class PassportDetailsModel
{
    [Key(), DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public Guid PassportDetailsId { get; set; }
    [Required]
    public string IssuingCountry { get; set; }
    [Required]
    public DateTime Issued { get; set; }
    [Required]
    public DateTime ExpirationDate { get; set; }
    public virtual ClientModel Client { get; set; }
}

Account class:

  [Table("AccountClient")]
public class AccountClientModel
{
    [Key(), DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public Guid AccountId { get; set; }
    [Required]
    public string Username { get; set; }
    [Required]
    public string Password { get; set; }
    public virtual ClientModel Client { get; set; }
}

Membership class:

[Table("MembershipClientValidation")]
public class MembershipClientValidationModel
{
    [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public Guid MembershipClientValidationId { get; set; }
    public DateTime MembershipStartDate { get; set; }
    public DateTime MembershipExpiryDate { get; set; }
    public bool IsMembershipValid { get; set; }
    [Required]
    public virtual ClientModel Client { get; set; }
}

I don't understand how to fix the 'unable to retrieve metadata for <class> error. How do I link classes with composite keys?

---

21-09-2015 After reading some comments I deleted the

DatabaseGenerated.DatabaseOption.Identity

In my primary key's in the other classes (Passport, Membership and Account). So I added some properties to my ClientModel:

        [ForeignKey("Passport")]
    public Guid PassportDetailsId { get; set; }
    public virtual PassportDetailsModel Passport { get; set; }

    [ForeignKey("Membership")]
    public Guid MembershipClientValidationId { get; set; }
    public virtual MembershipClientValidationModel Membership { get; set; }

    [ForeignKey("Account")]
    public Guid AccountClientId { get; set; }
    public virtual AccountClientModel Account { get; set; }

It still gives me the same error as it gave me above.

Answer 1

I fixed this problem by doing some simple changes.

I removed my three [ForeignKey("//")] in my ClientModel. I added the Foreign keys to my Primary keys in my other 3 models with reference to my ClientModel.

What I did next was the major fix. I added [Required] above the public ClientModel Client { get; set; } public ClientModel Client { get; set; } public ClientModel Client { get; set; } in my other three models.

Now it works and scaffolds my ClientController without error(s). So to show an example of one of the other three models:

public class MembershipClientValidationModel
{
    [Key]
    [ForeignKey("Client")]
    public Guid ClientId { get; set; }
    public DateTime MembershipStartDate { get; set; }
    public DateTime MembershipExpiryDate { get; set; }
    public bool IsMembershipValid { get; set; }
    [Required]
    public virtual ClientModel Client { get; set; }
}

It just works.