In my Ruby on Rails 7 application I have a large Account model with various has_many associations (most of them are left out for brevity here):

class Account < ApplicationRecord

  has_one   :address,         :dependent => :destroy, :as => :addressable # Polymorphic!
  has_many  :articles,        :dependent => :destroy
  has_many  :bank_accounts,   :dependent => :destroy, :as => :bankable # Polymorphic!
  has_many  :clients,         :dependent => :destroy
  has_many  :invoices,        :dependent => :destroy
  has_many  :languages,       :dependent => :destroy
  has_many  :payments,        :dependent => :destroy
  has_many  :projects,        :dependent => :destroy
  has_many  :reminders,       :dependent => :destroy
  has_many  :tasks,           :dependent => :destroy
  has_many  :users,           :dependent => :destroy

end

Users may create a guest account and then later switch it over to a registered account.

I have created a Service object to achieve this task:

class Accounts::Move < ApplicationService

  def initialize(account)
    @account = account
    @guest_account = @account.guest_account
  end

  def call
    if @guest_account
      update_dependencies
      @guest_account.delete
      reset_guest_account_id
    end
  end

private

  def update_dependencies
    dependencies.each do |dependency|
      dependency.constantize.where(:account_id => @guest_account.id).update_all(:account_id => @account.id) # Not working with polymorphic associations!
    end
  end

  def dependencies
    Account.reflect_on_all_associations.map(&:class_name)
  end

  def reset_guest_account_id
    @account.update_column(:guest_account_id, nil)
  end

end

This works well for all associations that have an account_id column, however it doesn’t work for polymorphic associations such as address and bank_accounts.

How can I switch over those too without having to hardcode the column names of the foreign keys (addressable_id and bankable_id in this case, for example)?