[Rails] 3 models in a form.

Hello,

class Customer < ActiveRecord::Base
has_many :deliveries

class Delivery < ActiveRecord::Base
has_many :delivery_items
has_many :products, :through => :delivery_items
belongs_to :customer

class DeliveryItem < ActiveRecord::Base
belongs_to :delivery
belongs_to :product

I create a new delivery for customer x:

= simple_form_for @customer do |f|
= f.simple_fields_for :deliveries do |deliveries_f|
.block
.column.span-12
= deliveries_f.association :products, :multiple => true,
:selected => @products_selected_id,
:input_html => { :title => "-
Select product -" }, :label => false
= deliveries_f.input :notes

DeliveryItem has the extra attribute quantity.
In this form I have to set a quantity DeliveryItem attribute so that I
create a Delivery for customer x, associate one or more Product and
for a product set the quantity.
How can I do in the form?

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