Devise: User belongs_to organization

I am using devise for authentication, and on the Sign Up page I have a text field for 'organization' so when the user signs up, they will create an organization, and I want the user to be associated with that organization (user model has organization_id attribute). I have created the devise views, and added a fields_for for the organization name. In my models I have User belongs_to :organization and Organization has_many :users (there will be more than one user associated to organizations). I have been down every path I could find trying to do this without modifying the controller, but have had no luck. Please don't suggest doing this without modifying the controller unless you have a sample app where you have implemented it that you can point to.

I have created a registrations controller as is laid out here: Override devise registrations controller

I just threw a few puts statements in the controller, and I don't see those being displayed on the console, so it looks like I am not getting to this controller.

I also copied my views from app/view/devise/registrations to app/views/registrations after which my views seem to come from outer space! The organization field I created no longer is displayed, and I can't seem to tell where the view is loaded from.

Sorry for not being more succinct, but I'm not sure where to go with this.

You can use accepts_nested_attributes_for in your User model (documentation)

It should look like:

class User < ActiveRecord::Base
  belongs_to :organization
  accepts_nested_attributes_for :organization
end

class Organization < ActiveRecord::Base
  has_many :users
end

In views you could use Rails helper or create field by hand:

<input type="text" name="user[organization_attributes][name]">

<% user = User.new(organization => Organization.new) %>
<%= form_for user do |form| %>
  <%= form.fields_for user.organization do |organization_form| %>
    <%= organization_form.text_field :name %>
  <% end %>
<% end %>

EDIT: Your devise view should look like:

<h2>Sign up</h2>
<% resource.organization ||= Organization.new %>
<%= form_for(resource, :as => resource_name, :url => registration_path(resource_name)) do |f| %>
  <%= devise_error_messages! %>
  <div><%= f.label :email %><br />
  <%= f.email_field :email %></div>

  <%= f.fields_for resource.organization do |organization_form| %> 
    <div><%= organization_form.label :name %><br />
    <%= organization_form.text_field :name %></div>
  <% end %>

  <div><%= f.label :password %><br />
  <%= f.password_field :password %></div>
  <div><%= f.label :password_confirmation %><br />
  <%= f.password_field :password_confirmation %></div>
  <div><%= f.submit "Sign up" %></div>
<% end %>
<%= render :partial => "devise/shared/links" %>