accepts_nested_attributes_for stops my sub-form rendering?

I have an association between 2 models, Business and Address. where the business has a registered_address. I have done this as follows.

class Business < ActiveRecord::Base  
    has_one :registered_address, :class_name => "Address", :foreign_key => :business_registered_address_id
    accepts_nested_attributes_for :registered_address
end

class Address < ActiveRecord::Base
    belongs_to :business
end

This association works fine for my purposes. When I render the form using:

= form_for @business do |form|
  = form.inputs :name => "Registered address" do
    = form.fields_for :registered_address do |address|
  开发者_JS百科    = address.input :postcode
      = address.input :line_1
      = address.input :line_2
      = address.input :line_3
      = address.input :town
      = address.input :county

Nothing is displayed, just an empty fieldset.

When I comment out the accepts_nested_attributes_for line in Business model, it displays (but doesn't save) all the fields correctly.

Can anyone see what I'm doing wrong?

Thank you

Write in your controller for this action (new as I think)

def new
  @business = Business.new
  @business.build_registered_address
  ...
end

or in your form @business.registered_address.new

= form_for @business do |form|
  = form.inputs :name => "Registered address" do
    = form.fields_for :registered_address, @business.registered_address.new do |address|
      = address.input :postcode
      = address.input :line_1
      = address.input :line_2
      = address.input :line_3
      = address.input :town
      = address.input :county

form.fields_for renders its block for each object in @business.registered_adress. If your array is empty nothing in showed.

You can write, for example on your controller:

@bussines.registered_address.new

And then the app will display all the form

Hope this helps