I've noticed a couple of people tripping up (myself included) on using the new nested model forms across has_one relationships. Because @parentModel.childModel returns nil (as opposed to [] for a has_many relationship) it is not possible to assign attributes to a new child model in a has_one relationship without running @parentModel.build_childModel first.
I've explained the exact error and the solution in more detail here : http://www.pixellatedvisions.com/2009/03/18/rails-2-3-nested-model-forms-and-nil-new-record Would it be possible to amend the rails guides and the documentation on the rails blog on nested model forms to clarify this extra step which is required for has_one relationships? The documentation as it stands gives the impression that has_many and has_one are interchangeable without any modification to your nested form code. Just a simple note on this extra build_ step could save users a lot of head scratching. Cheers Anton P.S The complex_form_examples were invaluable in helping me track down where I was going wrong in this instance. These are a great idea for when you are having problems getting your own code to work and you need a working example. Thank you to those responsible! --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Core" 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-core?hl=en -~----------~----~----~----~------~----~------~--~---
