optional_session_store.rb

class OptionalSessionStore < SqlSessionStore

  cattr_accessor :enabled_session_class  
  cattr_accessor :disabled

  class << self
    def disabled=(v)
      if self.disabled != v
        @@disabled = v
        self.toggle_session_class
      end
    end

    def toggle_session_class
      if self.disabled
        SqlSessionStore.session_class = NoSession
      else
        SqlSessionStore.session_class = self.enabled_session_class
      end
    end  
  end
  
  def call(env)
    # Make sure our disabled state is current
    self.class.toggle_session_class
    super(env)
  end
end