ef code first mapping one table into some entities

Question

I try to solve following:

In the entities HRCard and BPCard I have properties

public int DefaultAddressId { get; set; }

[ForeignKey("DefaultAddressId")]
public AddressDetail Address { get; set; } // table AddressDetail

so far no problem, now my Problem: In BPCard i have additionally a property:

public virtual ICollection<AddressDetail> Addresses { get; set; } //table AddressDetail

following the complete Code:

public abstract class EntityBase : IEntityModel {
[Key]
public int EntityId { get; set; }

[Required]
[StringLength(50)]
public string EntityKey { get; set; }

//...
}

// table HRCards
public class HRCard : EntityBase {
//Id from base class
// working fine
//...

public int DefaultAddressId { get; set; }

[ForeignKey("DefaultAddressId")]
public AddressDetail Address { get; set; } // table AddressDetail
}

// table BPCards
public class BPCard : EntityBase {
//Id from base class
// working fine
//...
public int DefaultAddressId { get; set; }
public int DefaultContactId { get; set; }

//working fine
[ForeignKey("DefaultAddressId")]
public AddressDetail DefaultAddress { get; set; } //table AddressDetail

//how can i solve this??
// table AddressDetail
public virtual ICollection<AddressDetail> Addresses { get; set; } 
}

public class AddressDetail : EntityBase {
//Id from base class
// working fine
//...
public int ParentId { get; set; }
}

I have long time searched, but no result solve my problem really. My 1st solution was split the table into HRAddress and BPAddress this is working fine.

Edit: If I start enable migrations I get an error message:

"The property 'ParentId' cannot be configured as a navigation property. The property must be a valid entity type and the property should have a non-abstract getter and setter. For collection properties the type must implement ICollection where T is a valid entity type."

many thanks

PS: can I change the tags later for better mapping?

Answer 1

It depends on the expected relationship you want with the Address POCO

You can solve the relationship using the annotation with something like

public class AddressDetail : EntityBase {
//Id from base class

public virtual ICollection<BPCard> Addresses { get; set; } 
//public virtual BPCard Addresses { get; set; } 
public virtual ICollection<HRCard> Addresses { get; set; } 
//public virtual BPCard Addresses { get; set; } 
}

or directly on your model with something like

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
        //one-to-many
        modelBuilder.Entity<HRCard>()
                    .HasMany<AddressDetails>(s => s.Id)
                    .WithRequired(s => s.HRCard)
                    .HasForeignKey(s => s.AddressId);
}