I am trying to load a resource through cancancan. How ever they end up nil. Am I missing some thing?

ideas_controller.rb

class Management::Budgets::IdeasController < Management::BaseController

  load_resource :budget
  load_resource :investment, through: :budget, class: 'Budget::Investment'
  
  def index
    # @investments = nil
  end
  
  def new
    # @investment = nil
  end
end