EF5 CodeFirst + Relationships between non-key columns - entity-framework

Question

In have two classes;
public class Item
{
[Key]
public int Id { get; set; }
[Required]
public string Name { get; set; }
public virtual BinCard BinCard { get; set; }
}
and
public class BinCard
{
[Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int Id { get; set; }
[Required]
public int ItemId { get; set; }
[Required]
public DateTime Date { get; set; }
[Required]
public double Qty { get; set; }
public ObservableCollection<Item> Item { get; set; }
}
The BinCard.Id is the PK and auto increments.
I want the relationship between two tables using Item.Id and BinCard.ItemId using*FluentAPI*.
Please help me to create this relationship correctly.

Answer 1

EF does not support non-PK principal Ids because it doesn't support unique keys other than PKs yet. To make this work you will have to create relationship based on BinCard.Id and BinCardId to Item entity - btw. it looks like the correct way to build relationship in your model. Your current model looks really strange.

Answer 2

Thanks for all replies. This is the solution for my question.
public class BinCard
{
[Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int Id { get; set; }
[Required]
public int ItemId { get; set; }
[Required]
public DateTime Date { get; set; }
[Required]
public double Qty { get; set; }
public virtual Drug Drug { get; set; }
}
public class Item
{
[Key]
public int Id { get; set; }
[Required]
public string Name { get; set; }
public ObservableCollection<BinCard> BinCard { get; set; }
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Drug>()
.HasRequired(s => s.Stock)
.WithRequiredPrincipal(s => s.Drug);
}