使用StringObjectIdGenerator映射的ID在数据库中生成字符串_id

Question

I'm moving over my code to the new 2.0 driver, and having an issue with ObjectIds.

Previously I had decorated string Id properties with BsonId and BsonRepresentation attributes.

Now i'm using class maps

BsonClassMap.RegisterClassMap<Model>(cm =>
       {
           cm.MapIdMember(p => p.Id).SetIdGenerator(StringObjectIdGenerator.Instance);
           cm.SetIgnoreExtraElements(true);
           cm.AutoMap();

       });

model is really simple in this example

public class Model
{
   public string Id { get; set; }
   public DateTime UpdatedTs { get; set; }
} 

however after inserting, I get the object id back as string, but it's also a string on the server.

Image of MongoVue objectid is string

Is there something I'm missing?

Thanks Sam

Answer 1

Ok, thanks to some feedback from Craig on the mongodb driver team, the solution I got working was:

cm.MapIdMember(p => p.Id)
                .SetIdGenerator(StringObjectIdGenerator.Instance)
                .SetSerializer(new StringSerializer(BsonType.ObjectId));   

Like when decorating the properties of the Id property, you need to set the Representation which in v 2.0 you do by SetSerializer

HTH