ASP MVC4 + NHibernate objects in Session

Question

I need to save a hibernate object into session and then retrieve one of it's foreign key properties like this:

public ActionResult Login(LoginModel model, string returnUrl) {
    User usr = _userRepository.GetById(Convert.ToInt32(ModelState["User"].Value.AttemptedValue));
    Session["user"] = usr;

}

public ActionResult Index() {
     Customer customerActive = Session["user"].Customer.Active;
     // this line throws an error:
    // Initializing[Myproj.Models.Customer#3]-Could not initialize proxy - no Session.
}

As User.Customer is a foreign key and NHIbernate lazy loads it, the call fails. How could I prevent this "No session" failure?

For example try this reading: hackingon.net/post/…. MVC and NHibernate means, introduce session per request. Open at the begining, close at the end. All the Lazy loaded features will have access to Session... there is nothing surprising... — Radim Köhler
– Radim Köhler, Commented Mar 6, 2014 at 7:44
This would not work as transactions are in this case only committed at the end of each request, meaning only a generic error page can be shown instead of specific ones. — Rok
– Rok, Commented Mar 6, 2014 at 8:07
Youd should use the full power of the MVC. Use one request for Write operations... another for display (success or error). This could be done easily with RedirectTo... both controller/action will have their own full session access — Radim Köhler
– Radim Köhler, Commented Mar 6, 2014 at 8:09

dove · Accepted Answer · 2014-03-06 09:24:38Z

If you want to continue with existing approach you would want to make sure that Customer is initialized before it was put into the session, e.g.

var userId = Convert.ToInt32(ModelState["User"].Value.AttemptedValue);
User usr = _userRepository.GetById(userId);
NHibernateUtil.Initialize(usr.Customer);
Session["user"] = usr;

but...

as commentators have hinted there are probably various better approaches as the session is not a great place to store what might become large and complex objects which have to be serialized and stored remotely if you are in a web farm.

If passing the userId around and loading from the database each time is a performance hit for you there are several things you can do, e.g.

You could put some caching in front of the database call
Store some basic user data within a cookie (or local storage) to save any db hit -

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