How to get a legit ActionController with a nil @session para

A browser sends a request (/main/index) so ROR creates an instance of
main_controller and invokes the index action on it. main_controller has
registered audit" as a before_filter.audit" is called first before
``index". so far so good.

def audit() does this:

    // the login_controller handles the login page and
    // knows whether or not there's a valid login by
    // inspecting the session param in a certain way
    // which it encapsulates.
    //
    // remember: audit is a method inside main_controller
    c = AuthenticationController.new
    if c.valid_user == true  // if there's a valid login
       .  .  .

The problem: when c.valid_user (that is LoginController.valid_user via
the `c’ object) attempts to read from it’s @session param it is nil.

Conclusion: AuthenticationController.new creates a new controller but
its @session param is nil.
Implication: During the normal course of routing action calls, the ROR
framework creates your controller on your behalf via its class method
.new and, at a later time, also sets the session variable for your.

The design goal here is simple: delegation: I can have exactly one
class encapsulate all the authentication stuff. However my design is
broken because of the unexpected problem of not accessing the @session
pram

Comments?

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