Nested Attributes in Rails 3

Question

can anyone please walk me through Nested Attributes in Rails 3?

I have two Models: Certificates and Custodians, related as follows:

Certificate Model:

<

Answer 1

accepts_nested_attributes_for should go on the side of one in the one-to-many relationship.

class Custodian < ActiveRecord::Base
  has_many :certificates
  accepts_nested_attributes_for :certificates
end

So, in your view, there should be no fields_for :custodian, it's on the wrong side. If you have to build a certificate from that view, you have to list custodians available, probably in a select box.

Answer 2

This line

<% f.fields_for :custodian do |custodian| -%>

should be

<%= f.fields_for :custodian do |custodian| -%>

Answer 3

With a belongs_to, it should be

@certificate.build_custodian