How to set up these associations and nested form

Rails
1

Hi!

I’m creating a simple signup form where people can sign up for a camp.
They
should be able to add a contact person and also sign up other people
(such
as family members).

Two models:
Application
has_many :participants
accepts_nested_attributes_for :participants

Participant
belongs_to :application

I have some trouble with the contact person, which is also a
participant. I
guess I should add something like this:

Application
has_many :participants
belongs_to :contact_person, :class_name => “Participant”, :foreign_key
=>
“contact_person_id”
accepts_nested_attributes_for :participants, :contact_person

Ok, so then I try to set up my nested form. In my
ApplicationsController#new method I do this:

def new
@application = Application.new
2.times { @application.participants.build }
1.times { @application.contact_person.build }
end

But that gives me an error: “undefined method `build’ for nil:NilClass”.
The error comes from: “@application.contact_person.build”, so
contact_person is nil.

So, any ideas what I have done wrong? It was a while ago I fiddled with
nested forms like this…

Thanks!

2

On Sat, Mar 31, 2012 at 7:59 PM, Linus P.
[email protected] wrote:

accepts_nested_attributes_for :participants, :contact_person
But that gives me an error: “undefined method `build’ for nil:NilClass”.The
error comes from: “@application.contact_person.build”, so contact_person is
nil.

The correct wording is (somewhat confusingly)

@application.build_contact_person

Check these tables for the exact names of the singular and plural
associations:

HTH,

Peter