How to handle class inheritance in LiteDB with custom IDs

Question

I would like to persist a class which implements an interface and can have various subclasses. I am just trying to understand how LiteDB handles this setup.

In particular I have a code structure like so:

public interface IItem
{
   string UniqueKey { get; set;
   string OtherProperties { get; set; }
}

public class Item : IItem
{
   public string UniqueKey { get; set; }
   public string OtherProperties { get; set; }
}

public class ItemOne : Item
{
   public string ItemOneProperty { get; set; }
}

public class ItemTwo : Item
{
   public string ItemTwoProperty { get; set; }
}

public class Main
{
   public void Init()
   {
      // Can this apply to all interface implementations?
      BsonMapper.Global.Entity<IItem>().Id(oid => oid.UniqueKey);

      // This will apply to Item but not ItemOne or ItemTwo 
      BsonMapper.Global.Entity<Item>().Id(oid => oid.UniqueKey);

   }
}

For reasons of wanting to keep the class structure clean, I do not want to use [BsonId] on the key. This means I need to use the BsonMapper to declare the ID. However, it looks like even though the mapper defines the ID on the base interface, it does not apply to any of the concrete classes.

Ideally, I do not want to declare the ID for every subclass in BsonMapper as - aside from there being many subclasses - it would create an unwanted dependency.

Does anyone know the best approach to solve this issue?

How to handle class inheritance in LiteDB with custom IDs

0 Answers0