Used to login user from cache manifest enabled page

reports_controller.rb

  def login_from_cached_page
    current_user_id = params[:current_user_id]
    # don't login based on parameter from offline page unless there is NO current user
    if current_user.nil?
      cu = User.find(current_user_id)
      sign_in :user, cu
      message = "current user not logged in"
    else
      message = "current user already logged in"
    end
    respond_to do |format|
      format.json  { render :json => {:message => message, :head => :ok} }
    end
  end