edit.html.erb

From Devise views

<h2>Edit <%= resource_name.to_s.humanize %></h2>

<% form_for resource_name, resource, :url => registration_path(resource_name), :html => { :method => :put } do |f| -%>
  <%= f.error_messages %>

  <p><%= f.label :email %></p>
  <p><%= f.text_field :email %></p>

  <p><%= f.label :password %> <i>(leave blank if you don't want to change it)</i></p>
  <p><%= f.password_field :password %></p>

  <p><%= f.label :password_confirmation %></p>
  <p><%= f.password_field :password_confirmation %></p>

  <p><%= f.label :current_password %> <i>(we need your current password to confirm your changes)</i></p>
  <p><%= f.password_field :current_password %></p>

	<% f.fields_for :profile do |profile| %>
	  <p>
	    <%= profile.label :name %><br />
	    <%= profile.text_field :name %>
	  </p>
	  <p>
	    <%= profile.label :url %><br />
	    <%= profile.text_field :url %>
	  </p>
	  <p>
	    <%= profile.label :company %><br />
	    <%= profile.text_field :company %>
	  </p>
	  <p>
	    <%= profile.label :location %><br />
	    <%= profile.text_field :location %>
	  </p>
	<% end %>

  <p><%= f.submit "Update" %></p>
<% end -%>

<h3>Cancel my account</h3>

<p>Unhappy? <%= link_to "Cancel my account", registration_path(resource_name), :confirm => "Are you sure?", :method => :delete %>.</p>

<%= render :partial => "shared/devise_links" %>

gistfile4.txt

Profile had user_id for has one and belongs to association.

profile.rb

class Profile < ActiveRecord::Base
  belongs_to :user
  
  attr_accessible :user_id, :name, :url, :company, :location
end

User.rb

class User < ActiveRecord::Base
  has_one :profile, :dependent => :destroy
  
  
  # Include default devise modules. Others available are:
  # :http_authenticatable, :token_authenticatable, :confirmable, :lockable, :timeoutable and :activatable
  devise :registerable, :database_authenticatable, :recoverable,
         :rememberable, :trackable, :validatable

  # Setup accessible (or protected) attributes for your model
  attr_accessible :email, :password, :password_confirmation, :profile_attributes
  
  accepts_nested_attributes_for :profile
end