Looks like I am having a breaking change in 1.9 up from 1.8.3.

I have an abstract base class with an “Id” property:
public abstract string Id

{ get; set; }

In my standard model, that string is given an ObjectId string representation. However, if I have a model that implements IScenario that Id stays as a unique string representation.

In 1.9, this abstract Id column does not appear in my concrete type’s DeclaredMemberMaps.

Example:

[TestClass]
public class ModelMapTests
{
public abstract class MyBase { public abstract string Id { get; set; }

}
public class MyConcrete : MyBase { public override string Id

{ get; set; }

}

public class AbstractColumnConvention : IClassMapConvention
{
public void Apply(BsonClassMap classMap)
{
if(classMap.ClassType == typeof(MyConcrete))

{ Assert.IsTrue(classMap.DeclaredMemberMaps.Any(m => m.MemberName == "Id")); }

}

public string Name
{
get

{ return "Abstract Column Convention"; }

}

}

[TestMethod]
public void ConcreteTypeHasAbstractFields()
{
var conventions = new ConventionPack();
conventions.Add(new AbstractColumnConvention());

ConventionRegistry.Register("My Conventions", conventions, t =>

{ return t.IsAssignableFrom(typeof(MyConcrete)); }

);

BsonClassMap.LookupClassMap(typeof(MyConcrete));
}
}

In 1.8.3 Id was found when mapping MyConcrete. In 1.9 it is not found in MyConcrete, which prevents me from mapping things properly (i.e. how I mapped them under 1.8.3).