I have been getting all kinds of conflicting information regarding this basic question, and the answer is pretty crucial to my current problems. So, very simply, in Rails 3, is it allowed or not allowed to use accepts_nested_attributes_for with a belongs_to relationship?
class User < ActiveRecord::Base
belongs_to :organization
accepts_nested_attributes_for :organization
end
class Organization < ActiveRecord::Base
has_many :users
end
In a view:
= form_for @user do |f|
f.label :name, "Name"
f.input :name
= f.fields_for :organization do |o|
o.label :city, "City"
o.input :city
f.submit "Submit"
Nested attributes appear to work fine for a belongs_to association as of Rails 4. It might have been changed in an earlier version of Rails, but I tested in 4.0.4 and it definitely works as expected.