class TechnologyParentTechnology < ApplicationRecord
  include HasContentLinking

  belongs_to :user, optional: true
  belongs_to :technology
  belongs_to :parent_technology, class_name: Technology.name, optional: true

  after_create do
    this_object  = Technology.find_by(id: self.technology_id)
    other_object = Technology.find_by(id: self.parent_technology_id)

    other_object.technology_child_technologies.create(
      technology:       other_object,
      child_technology: this_object
    ) unless other_object.child_technologies.include?(this_object)
  end

  after_destroy do
    # This is a two-way relation, so we should also delete the reverse association
    this_object  = Technology.find_by(id: self.technology_id)
    other_object = Technology.find_by(id: self.parent_technology_id)

    other_object.child_technologies.delete(this_object) if other_object.present?
  end
end