Cannot mass-assignment 问题

class User < ActiveRecord::Base
	has_one :profile, :dependent => :destroy
	attr_accessible :login, :email, :password, :password_confirmation, :identity_url
end

class Profile < ActiveRecord::Base
  belongs_to :user
  attr_accessible :name, :gender, :birthday, :place, :about_me  
end

class ProfilesController < ApplicationController
  before_filter :login_required
  
  def edit
    @user = User.find(current_user)
    @profile = @user.profile
  end
  
  def update
    @user = User.find(current_user)
    @profile = @user.profile   
    respond_to do |format|
      if @profile.update_attributes(@user.profile.attributes) 
# 如果我在这里使用这个if @profile.update_attributes(params[:profile])，在更新是，log会报错说是：undefined method `stringify_keys!' 
        flash[:notice] = 'Your profile was successfully updated.'
        format.html { redirect_to user_url(@user) }
        format.xml  { head :ok }
      else
        format.html { render :action => "edit" }
        format.xml  { render :xml => @profile.errors, :status => :unprocessable_entity }
      end
    end
  end  
end

<h2>Edit Your Profile</h2>
<%= error_messages_for :profile %> 

<% form_for (:profile, :url => user_profile_path(@user), :html => {:method => :put}, :index => nil) do |f|%>
	 <p>
	   Name: 

	   <%= f.text_field :name %>
	 </p>
     
	 <p>
	   Gender: 

	   <%= f.text_field :gender %>
	 </p>
	 <p>
	   My Place: 

	   <%= f.text_field :place %>
	 </p>
	 <p>
	   My Birthday: 

	   <%= f.text_field :birthday %>
	 </p>
	 <p>
	   About Me

	   <%= f.text_area :about_me %>
	 </p>
<%= submit_tag 'Update' %>
	<% end %>

 map.resources :users do |users|
    users.resource :profile, :controller => 'profiles', :action => 'edit'
  end