Rails - Jul 2012 - Nested Forms with belongs_to association

tl;dr: nested attributes isn''t setting the belongs_to association

I have these two models right now:

class Organization < ActiveRecord::Base
  has_many :groups
  belongs_to :main_group, :class_name => Group.name, :foreign_key => 
:main_group_id, :autosave => true

  validates_presence_of :main_group

  accepts_nested_attributes_for :main_group, :allow_destroy => true
end

class Group < ActiveRecord::Base
  belongs_to :organization, :autosave => true

  validates_presence_of :organization
end

I want to create a nested form that will create a new User along with the 
Organization along with a new Group. My form code is the following:
<%= form_for(@user) do |f| %>
      <%= f.label :email, "Email Address" %>

      <%= fields_for :organization, @organization do |org_f| %>
        <%= org_f.label :name, "Organization Name" %>
        <%= org_f.text_field :name %>
        <% if org_f.object.new_record? %>
          <%= org_f.fields_for :main_group do |main_f| %>
            <%= main_f.label :name, "Your Org''s Main
Group" %>
            <%= main_f.text_field :name %>
          <% end %>
        <% end %>
      <% end %>
<% end %>

Here''s my Controller''s action code that''s giving me
errors:
  def create
    @user = User.new(params[:user])
    if !params[:secret].to_s.empty?
      @user.accept_invitation(params[:organization][:id], params[:secret])
      @organization = @user.organizations.first || Organization.new
    else
      @organization = 
@user.organizations.build(params[:organization].slice!(:id))
      @organization.main_group.organization = @organization
    end

  def create
    if !params[:secret].to_s.empty?
      @user.accept_invitation(params[:organization][:id], params[:secret])
      @organization = @user.organizations.first || Organization.new
    else
      @organization = 
@user.organizations.build(params[:organization].slice!(:id))
      # If I comment out the following line, it''ll break
      #  @organization.main_group.organization = @organization
    end
  end

My question is: is there a more elegant way to set the #main_group''s 
association to the organization than the commented line above?

Thanks everyone.

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