[Rails] Nested Attributes in Rails 3

Hello All,

I am stuck in nested attributes:-

here is my code :-

User.rb :-

has_one :address

accepts_nested_attributes_for :address

Address.rb :-

belongs_to :user

_form.html.erb:-

<%= simple_form_for @user ,:validate => true do |f| %>

           <%= f.fields_for :address do |d| %>

         <%= d.input :first_name %>

         <%= d.input :last_name %>

          <% end %>

          <%= f.input :email %>

 <% end %>

in user_controller.rb:-

In new as well as create method I tried with:-

@user = User.new

@user.build_profile

But still I am getting the error as :-

Can't mass-assign protected attributes: address_attributes

Any Suggestions ??

Thanks....

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