Guys, thank you very much for all your answers! I finally used Matt's solution because the Address model have an association. It works great.
On 25 jul, 14:36, Matt Jones <[email protected]> wrote: > You can also use the methods included from ActiveRecord::Dirty on the > foreign key fields; in your case, you'd have an after_save callback > like this (on Person): > > after_save :cleanup_addresses > > def cleanup_addresses > Address.destroy(shipping_address_id_was) if > shipping_address_id_changed? && shipping_address_id_was > Address.destroy(billing_address_id_was) if > billing_address_id_changed? && billing_address_id_was > end > > Some notes on this: > > - if you don't have any callbacks or observers on Address, you can > simplify the .destroy calls to .delete, and save instantiating some > Address objects. > - if your UI allows users to swap the addresses (ie, > shipping_address_id is swapped with billing_address_id, without any > new DB records), you'll need to have a better check in > cleanup_addresses; the current code will end up deleting both > addresses in that case. > > --Matt Jones > > On Jul 24, 6:33 pm, Emma <[email protected]> wrote: > > > I'm having trouble with this model: > > > class Person < AR::B > > belongs_to :shipping_address, :class_name => 'Address' > > belongs_to :billing_address, :class_name => 'Address' > > end > > > class Address < AR::B > > end > > > The problem is that I want Address to be a Value Object (as in DDD), > > and if I do this: > > p = Person.create :shipping_address => Address.new(...) > > > and later I change the address: > > p.shipping_address = Address.new(...) > > p.save > > > the first address object doesn't get deleted from the DB. It becomes > > an orphan. > > > I can inverse the association and use a has_one but then I have to put > > two foreign keys in the address table... and that could be a problem > > because there are other models that have addresses. > > > Another option could be to model both associations as composed_of but > > then I have to put all of the address table columns on the people > > table, and repeat this on the other models that have addresses too. > > > How can I solve this? Any suggestions? > > Thanks in advance. > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
