ruby on rails - accepts_nested_attributes_for and second-order associations, nested forms -

i have following models associations:

class order < activerecord::base   has_many :guests   has_many :customers, :through => :guests   accepts_nested_attributes_for :customers end  class customer < activerecord::base    has_many :guests    has_many :orders, :through => :guests    has_many :slips    accepts_nested_attributes_for :slips end  class slip < activerecord::base    belongs_to :order    belongs_to :customer end  class guest < activerecord::base   belongs_to :order   belongs_to :customer end 

my nested form looks this:

<!-- general form --> <%= form_for(@order) |f| %>     <% f.fields_for :customers |builder| %>         <%= render "customer_fields", :f => builder %>     <% end %>     <%= f.submit %> <% end %>  <!-- partial customer_fields --> <p>     <%= f.label :name%><%= f.text_field :name %>     <% f.fields_for :slips |builder| %>         <%= render "slip_fields", :f => builder %>     <% end %> </p>  <!-- partial slip_fields --> <p><%= f.label :quantity%><%= f.text_field :quantity %></p> 

with setup saving order works expected, need order_id saved slip, have reference between order <-> slip. setup loose reference. can associated customers, i'll associated slips of customer related order or not.

---

here fields of models: order -> id
customer -> id
guest -> id, order_id, customer_id
slip -> id, order_id, customer_id

---

the result of order should this

• order
  
  1. customer
     • slip 1
     • slip 2
  2. customer b
     • slip 1
     • slip 2
  3. customer
     • slip 1
     • slip 2
     • slip 3

---

i've no idea how accomplish this.

as far can't return order_id order isn't exist can hook (i haven't test it, you'll maybe need fix it)

def create   customers = params[:order].delete :customers_attributes   @order = order.new params[:order]   if @order.save     customers.each{|c| c[:slips_attributes].each{|s| s[:order_id] = @order.id} }     @order.customers_attributes = customers     @order.save   end end  def update   @order = order.find params[:id]   params[:order][:customers_attributes].each{|c| c[:slips_attributes].each{|s| s[:order_id] = @order.id} }   @order = order.update_attributes params[:order]   @order.save end 

also you'd better remove logic model , can dry little. understanding approach.

upd id collisions. scetch again

def create   customers = params[:order].delete :customers_attributes   @order = order.new params[:order]   @order.customer_ids = customers.inject([]){|a,h| << h[:b] if h[:b]; a}   if @order.save     customers.each{|c| c[:slips_attributes].each{|s| s[:order_id] = @order.id} }     @order.customers_attributes = customers     @order.save   end end  def update   @order = order.find params[:id]   @order.customer_ids = params[:order][:customers_attributes].inject([]){|a,h| << h[:b] if h[:b]; a}   params[:order][:customers_attributes].each{|c| c[:slips_attributes].each{|s| s[:order_id] = @order.id} }   @order = order.update_attributes params[:order]   @order.save end