实体框架映射ID列表

Question

I am in a strange situation right now, I have two entities:

public class Proyect
{
    int id;
    List<int> stages;
}

public class Stage
{
    //PK, not FK to proyect
    int id;
}

I know that this is not the best way to model this kind of relation (n->1) but it was done this way and we can't change it.

Does someone know, how do I relate this entities (notation or overriding onModelCreation )?

We are using c#, ET4, VS2012, WS8.

Answer 1

I like to use Data Annotations for simple relationships. You must specify your key field on the Proyect table, and your foreign key on the Stage table. In the Proyect table, you should have a list of Stages, not ints, since you are relating to the Stage object. You can use the virtual keyword to use lazyloading on your related entities.

If you really need a list of type int, containing your stage Ids, just use an unmapped property.

public class Proyect{
    [Key]
    public int id { get; set;}
    public virtual List<Stage> stages { get; set;}
    [NotMapped]
    public virtual List<int> stageIds {
        get {
            return stages == null ? null : stages.Select(t => t.id).ToList();
        }
    }
}

public class Stage{
    public int id { get; set;}
    [ForeignKey("id")]
    public virtual Proyect Proyect { get; set;}
}