Double nested model forms - ruby-on-rails

Question

I am still having problems with nested forms. Here is my form code:
<%= form_for #account do |f| %>
<%= f.label :account_type %><br />
<%= f.text_field :account_type %><br />
<%= f.fields_for :organizations do |builder| %>
<%= builder.label :name %><br />
<%= builder.text_field :name %><br />
<%= builder.label :website %><br />
<%= builder.text_field :website %><br />
<%= f.fields_for :locations do |builder| %>
<%= builder.label :phone %><br />
<%= builder.text_field :phone %><br />
<%= builder.label :toll_free_phone %><br />
<%= builder.text_field :toll_free_phone %><br />
<%= builder.label :fax %><br />
<%= builder.text_field :fax %><br />
<% end %>
<% end %>
<%= f.submit "Add account" %>
<% end %>
The Account model:
class Account < ActiveRecord::Base
has_many :organizations
accepts_nested_attributes_for :organizations
end
The Organization model:
class Organization < ActiveRecord::Base
belongs_to :account
has_many :locations
accepts_nested_attributes_for :locations
end
And the Location model:
class Location < ActiveRecord::Base
belongs_to :organization
end
And lastly, the Accounts Controller:
class AccountsController < ApplicationController
def new
#account = Account.new
organization = #account.organizations.build
organization.locations.build
#header = "Create account"
end
def create
#account = Account.new(params[:account])
if #account.save
#handle success
else
render 'new'
end
end
end
Here is the error I am getting:
ActiveRecord::UnknownAttributeError in AccountsController#create
unknown attribute: locations
Rails.root: C:/Documents and Settings/Corey Quillen/My
Documents/rails_projects/shop_manager
Application Trace | Framework Trace | Full Trace
app/controllers/accounts_controller.rb:12:in `new'
app/controllers/accounts_controller.rb:12:in `create'
Request
Parameters:
{"utf8"=>"✓",
"authenticity_token"=>"xuZLSP+PSjdra3v51nIkJYZeXRM0X88iF135hPlp4sc=",
"account"=>{"account_type"=>"Company",
"organizations_attributes"=>{"0"=>{"name"=>"Atlas",
"website"=>"www.atlas.com"}},
"locations"=>{"phone"=>"555-555-5555",
"toll_free_phone"=>"800-555-5555",
"fax"=>"512-555-5555"}},
"commit"=>"Add account"}
Any help with this will be greatly appreciated. I have been looking at this now for a couple of hours.

Answer 1

You should use new builder in nested form for nested nested form :)) :
<%= form_for #account do |f| %>
<%= f.label :account_type %><br />
<%= f.text_field :account_type %><br />
<%= f.fields_for :organizations do |builder| %>
<%= builder.label :name %><br />
<%= builder.text_field :name %><br />
<%= builder.label :website %><br />
<%= builder.text_field :website %><br />
<%= builder.fields_for :locations do |lb| %>
<%= lb.label :phone %><br />
<%= lb.text_field :phone %><br />
<%= lb.label :toll_free_phone %><br />
<%= lb.text_field :toll_free_phone %><br />
<%= lb.label :fax %><br />
<%= lb.text_field :fax %><br />
<% end %>
<% end %>
<%= f.submit "Add account" %>
<% end %>

Answer 2

An even DRYer solution:
1) in your Gemfile, list nested_form as a dependency.
2) in your models do this:
class Account < ActiveRecord::Base
accepts_nested_attributes_for :organizations
end
class Organization < ActiveRecord::Base
accepts_nested_attributes_for :locations
end
3) create regular forms for Organization under ./app/view/organizations/
and for Location under./app/view/locations/`
4) in your Account form, do this: (it gets pretty short this way!)
<%= nested_form_for #account do |f| %>
<%= f.label :account_type %><br />
<%= f.text_field :account_type %><br />
<%= f.fields_for :organizations %>
<%= f.submit "Add account" %>
<% end %>
5) in your Organization form, do this: (also pretty short)
<%= nested_form_for #organization do |f| %>
<%= f.label :name %><br />
<%= f.text_field :name %><br />
<%= f.label :website %><br />
<%= f.text_field :website %><br />
<%= f.fields_for :locations %>
<%= f.submit "Add Organization" %>
<% end %>
Check these RailsCasts:
http://railscasts.com/episodes/196-nested-model-form-part-1
http://railscasts.com/episodes/197-nested-model-form-part-2