nested forms in rails 3

Question

I'm trying to setup a nested form and the main thing I can't get working is knowing when to do the build method. Here are my models:

class User < ActiveRecord::Base
  belongs_to :address
  accepts_nested_attributes_for :address
end

class Address < ActiveRecord::Base
  has_one :user
end

In all the examples I've found, which appear to be pre-rails 3, I see the following two methods:

user.address.empty?
user.address.build

I have managed to winnow out with my semi-asleep Google-Fu that the build has been replaced with:

user.build_address

What I'm trying to figure out is what's the replacement for empty? It doesn't appear to exist when I try things at the console, but user.build_address is wonderful.

Any ideas?

thanks...

er, maybe I'm overthinking this. user.address.nil?

user483040
– user483040

2011-08-07 12:40:54 +00:00
Commented Aug 7, 2011 at 12:40 — user483040
– user483040, Commented Aug 7, 2011 at 12:40

Hck · Accepted Answer · 2011-08-07 12:42:30Z

2

For the has_one relation build_address will create an empty address instance or will load already existing instance. So you don't need to call user.address.empty?.

answered Aug 7, 2011 at 12:42

Hck

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