Question

I have this chained LINQ query which MongoDB fails to execute:

RoleCollection.AsQueryable().Where(r => r.Users.Any(id => id == user.Id))
    .Select(r => r.Name).ToArray();

This results in the following error:

Any is only support for items that serialize into documents. The current serializer is ObjectIdSerializer and must implement IBsonDocumentSerializer for participation in Any queries. 

How can I translate the query into a native query which Mongo will support?

Answer 1

I got the following query working, although I’m not entirely certain as to its semantics yet:

RoleCollection.Find(new QueryDocument("Users", user.Id))
            .Select(r => r.Name).ToArray();