CanCanCan ability delegator. Like alias_action but across model classes

cancancan_ability_delegator.rb

# frozen_string_literal: true

module Abilities
  module AbilityDelegator
    def self.included(klass)
      klass.class_eval do
        def delegate_action(action_or_actions, to:, traversal:, user:)
          actions = [*action_or_actions]
          can actions, model_class do |instance|
            delegate = traversal.reduce(instance, &:public_send)
            user_ability = "::Abilities::#{delegate.class.name}Ability".constantize.new(user)
            user_ability.can?(to, delegate)
          end
        end

        private

        def model_class
          self.class.name.sub('Abilities::', '').sub('Ability', '').constantize
        end
      end
    end
  end
end