The latest 4.1 and 4.2 adapters have built in support for Rails UUID support. Since this commit, we fully support GUID as primary keys. It is easy to get back GUID's for existing records as your ...
On SQL Server, when a Guid property is value-generated, we use the special SequentialGuidValueGenerator; but when a string property is value-generated, we fall back to the core ValueGeneratorSelector, ...