Rails nested forms with has_one through relations

Question

I'm really struggling to understand how to create a nested form with a model connected by a second model. I've looked up a number of posts on SO, and tried many approaches, but can't figure it out, though I think I'm almost there.

I'm trying to create a subscription, customer and the customer's address in the one form but so far I've only managed to create the subscription and customer. I'm having problems with the address.

A customer can have many subscriptions, but only the one address (for the time being, anyway)

My (abbreviated) code looks like the following:

subscription.rb

class Subscription < ActiveRecord::Base

  belongs_to :customer
  has_one :address, through: :customer

  accepts_nested_attributes_for :customer, :address
  attr_accessible :customer_attributes, :address_attributes

customer.rb

class Customer < ActiveRecord::Base

  has_one :address
  has_many :subscriptions

  accepts_nested_attributes_for :address
  attr_accessible :address_attributes

address.rb

class Address < ActiveRecord::Base

  belongs_to :customer
  has_many :subscriptions, through: :customer

subscriptions_controller.rb

def new
  @subscription = Subscription.new    
  customer = @subscription.build_customer
  address = customer.build_address
  subscription_line_items = @subscription.subscription_line_items.build
end

subscriptions/_form.html.erb

<%= form_for(@subscription) do |subscription_form| %>
  <% if @subscription.errors.any? %>
    <!-- Error stuff -->
  <% end %>

  <div class="field">
    <%= subscription_form.label :start_date %><br />
    <%= subscription_form.text_field :start_date %>
  </div>

  ...

  <h2>Customer Details</h2>
  <%= subscription_form.fields_for :customer do |customer_fields| %>
    <%= customer_fields.label :first_name %><br /> 
    <%= customer_fields.text_field :first_name %>
    ...
  <% end %>

  <h2>Address</h2>
  <%= subscription_form.fields_for :address do |address_fields| %>
    <%= address_fields.label :address_1 %><br /> 
    <%= address_fields.text_field :address_1 %>
    ...
  <% end %>

  <div class="actions">
    <%= subscription_form.submit %>
  </div>
<% end %>

I know that my controller code is working, as when I try it directly in the console, I get an empty address object, but this isn't being rendered in the form, which leads me to believe my model code still isn't correct.

The only variable from your controller that will be passed through to your view will be the @subscription variable. You need to make the others instance variables too. — JosephL
– JosephL, Commented Feb 28, 2013 at 22:55
If I change to instance variables in the controller and in the fields_for in the view I get an error upon submitting Can't mass-assign protected attributes: customer, address — purpletonic
– purpletonic, Commented Mar 1, 2013 at 8:23

Hugo · Accepted Answer · 2013-03-10 04:50:24Z

1

Purpletonic, looking your latest problem about:

Can't mass-assign protected attributes: customer, address

you need to add those attributes in your model like:

attr_accessible :customer, :address

answered Mar 10, 2013 at 4:50

Hugo

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