Rails - Mar 2012 - How to set up these associations and nested form

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!

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On Sat, Mar 31, 2012 at 7:59 PM, Linus Pettersson
<linus.pettersson-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> 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.
The correct wording is (somewhat confusingly)

@application.build_contact_person

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

http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html

HTH,

Peter

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