User authentication, roles and permissions - servicestack

Question

In the AppHost module, I'm opening/creating an NHibernate based authentication repository (using the "ServiceStack.Authentication.NHibernate" module), and subsequently creating a default user:
HibernateFactory = RepoDatabaseFactory(typeof(ServiceStack.Authentication.NHibernate.UserAuthMap).Assembly);
NHSession = HibernateFactory.OpenSession();
container.Register(NHSession);
NHibernateUserAuthRepository UserRepository = new NHibernateUserAuthRepository(HibernateFactory);
container.Register(UserRepository);
CurrentSessionContext.Bind(NHSession);
var Authorization = UserRepository.GetUserAuthByUserName("miga");
if (Authorization == null)
{
UserRepository.CreateUserAuth(
new UserAuth
{
UserName = "miga",
FirstName = "xxxxxx",
LastName = "xxxxxx",
Address = "xxxxxxxxxxxx",
PostalCode = "xxxxxx",
City = "xxxxxx",
Country = "xxxxx",
Gender = "xxxxx",
PhoneNumber = "xxxxxx",
Email = "xxxxxxx",
Roles = new List<string> { RoleNames.Admin },
Culture = "xxxxx"
},
"xxxxxx");
}
container.Register<ICacheClient>(new MemoryCacheClient());
UserRepository.InitSchema();
where the RepoDatabaseFactory is:
public NHibernate.ISessionFactory RepoDatabaseFactory(Assembly AuthAssembly)
{
var Configuration = Fluently.Configure()
.Database(MsSqlConfiguration.MsSql2012.ConnectionString(ConnString).UseReflectionOptimizer()).Mappings(m =>
{
m.FluentMappings.AddFromAssembly(AuthAssembly);
})
.CurrentSessionContext("web")
.BuildConfiguration();
var Exporter = new SchemaExport(Configuration);
Exporter.Execute(false, false, false);
var SessionFactory = Configuration.BuildSessionFactory();
return (SessionFactory);
}
To a certain extent this works; i.e. the relevant tables are created ("UserAuth", "UserAuth_Permissions", "UserAuth_Roles", "UserOAuthProvider" and "UserOAuthProvider_Items"). When creating the user "miga" as above, you'll notice the line "Roles = new List { RoleNames.Admin }" in the "new UserAuth" statement. Subsequently, the user data above is in fact added to the "UserAuth" table, but the "Admin" role is not added to the "UserAuth_Roles" table as I would have expected. Inserting a new record in the "UserAuth_Roles" table manually (containing the user id of the "miga" user and the admin rolename - e.g. 1, "Admin") still - it appears - does not provide the "miga" user with an "Admin" role:
Using the following fragment:
var Client = new RestClient("http://localhost:42147/");
Client.Authenticator = new HttpBasicAuthenticator("miga", "xxxxxxxx");
var Request = new RestRequest("assignroles", Method.POST);
Request.RequestFormat = DataFormat.Json;
Request.AddBody(new { UserName = "Sally", Roles = "Write" });
var Response = Client.Post<AssignRoleResponse>(Request);
I get an authorization error with an "Invalid Role" message. So my question is basically how to get this working in an NHibernate context ?