belongs_to parent form with has_many nested form in Rails 3

Abbreviated models:

class Event < ActiveRecord::Base
  belongs_to :place
  accepts_nested_attributes_for :place  
end

class Place < ActiveRecord::Base
  has_many :events  
end

Abbreviated events controller:

  def new
    @event = Event.new
    @event.build_place

  def create
    @event = Event.new(params[:event])

    respond_to do |format|
      if @event.save

Abbreviated view:

<%= form_for(@event) do |f| %>
<%= fields_for @event.place do |place_f| %>

Given the above... I want a user to be able to create an event. When they create the event, they have the option of adding a place. The place may or may not exist in the database.

Right now, the place isn't associated or created on form submission, 开发者_如何学编程but it is definitely in the post parameters.

Any thoughts on what I'm doing wrong? This is for Rails 3.

---

If you dont want to let user fill place attributes, remove @event.build_place from your new action in controller like this

def new
  @event = Event.new
end

and remove <%= fields_for @event.place do |place_f| %> block from your view.