autosave no longer a valid option for belongs_to?

rubyonrails-talk
1

The Rails API doc (api.rubyonrails.org) says that :autosave is still a valid option for belongs_to in the latest version of Rails. However, a look at the activerecord/lib/active_record/associations.rb (line 1590) reveals that it is not in the @@valid_keys_for_belongs_to_association array. I also noticed that it's not in the ActiveRecord API doc (ar.rubyonrails.org).

Does anyone have any more information on this? What is the current best practice for persisting your child objects when saving a parent object? Here's an example:

class PaymentMethod < ActiveRecord::Base   belongs_to :billing_address, :class_name => "Address" end class Address < ActiveRecord::Base   validates_presence_of :line_one end class PaymentMethodsController < ActionController::Base   def update     @pm = PaymentMethod.find(params[:id])     @pm.billing_address.line_one = params[:billing_address][:line_one]     # ...     if @pm.save       # ...     end   end end

Thanks in advance.

Jason