CanCan, Rolify and RailsAdmin took my baby away

ability.rb

 class Ability
  include CanCan::Ability

  def initialize(user)
    user ||= User.new

    if user.has_role?(:metadmin)
      can :manage, :all
      can :manage, Carousel, market_id: user.market_id
    elsif user.has_role?(:editor)
      can :access, :rails_admin
      can :dashboard

      # Here'll be dragons:
      #
      # What I'm trying to accomplish here?
      #
      # Provided a user with a role like :director, director_instance
      # (see Rolify README for more info on that matter), I want the
      # user to be able to edit only that director_instance (via
      # RailsAdmin)

      # Why I'm doing this like I am?
      #
      # Good question.
      # According to CanCan's documentation, when using blocks to
      # define abilities, we cannot fetch records if we do not provide
      # the WHERE clause (for the SQL which is going to retrive the
      # records) explictly.
      # https://github.com/ryanb/cancan/wiki/Defining-Abilities-with-Blocks
      can [:index, :edit], Director,[""] do |director|
        user.has_role? :director, director
      end
    end


    cannot :export, :all
    cannot :create, [Carousel, Location]
    cannot :edit, Location
    cannot :destroy, Director
  end
end