class AccountController < ApplicationController
  def index
    unless logged_in?
      redirect_to :controller => :splash, :action => :index
    end
    @user = User.find(self.current_user.id)
  end

  def edit
    @user = User.find(self.current_user.id)
  end

  def update
    @user = User.find(self.current_user.id)
    if @user.update_attributes(params[:user])
      flash[:notice] = 'User was successfully updated.'
      redirect_to :action => 'index'
    else
      render :action => 'index'
    end
  end
end



<p>Edit your details</p>
<%= start_form_tag :action => 'update' %>
    <%= render :partial => 'userForm' %>
    <%= submit_tag 'Edit' %>
<%= end_form_tag %>


_userForm.rhtml

<%= error_messages_for 'user' %>
<!--[form:user]-->
<!-- all custom fields here -->
<p><label for="user_login">Username</label><br/>
<%= text_field 'user', 'login'  %></p>

<p><label for="user_password">Password</label><br/>
<%= password_field 'user', 'password'  %></p>

<p><label for="user_password_confirmation">Password Confirmation</label><br/>
<%= password_field 'user', 'password_confirmation'  %></p>

<p><label for="user_email">Email Address</label><br/>
<%= text_field 'user', 'email'  %></p>
<!--[eoform:user]-->




require 'digest/sha1'
class User < ActiveRecord::Base
  # Virtual attribute for the unencrypted password
  attr_accessor :password

  validates_presence_of     :login, :email
  validates_presence_of     :password,                   :if => :password_required?
  validates_presence_of     :password_confirmation,      :if => :password_required?
  validates_length_of       :password, :within => 4..40, :if => :password_required?
  validates_confirmation_of :password,                   :if => :password_required?
  validates_length_of       :login,    :within => 3..40
  validates_length_of       :email,    :within => 3..100
  validates_uniqueness_of   :login, :email, :case_sensitive => false
  before_save :encrypt_password

  # Authenticates a user by their login name and unencrypted password.  Returns the user or nil.
  def self.authenticate(login, password)
    u = find_by_login(login) # need to get the salt
    u && u.authenticated?(password) ? u : nil
  end

  # Encrypts some data with the salt.
  def self.encrypt(password, salt)
    Digest::SHA1.hexdigest("--#{salt}--#{password}--")
  end

  # Encrypts the password with the user salt
  def encrypt(password)
    self.class.encrypt(password, salt)
  end

  def authenticated?(password)
    crypted_password == encrypt(password)
  end

  def remember_token?
    remember_token_expires_at && Time.now.utc < remember_token_expires_at
  end

  # These create and unset the fields required for remembering users between browser closes
  def remember_me
    self.remember_token_expires_at = 2.weeks.from_now.utc
    self.remember_token            = encrypt("#{email}--#{remember_token_expires_at}")
    save(false)
  end

  def forget_me
    self.remember_token_expires_at = nil
    self.remember_token            = nil
    save(false)
  end

  protected
    # before filter
    def encrypt_password
      return if password.blank?
      self.salt = Digest::SHA1.hexdigest("--#{Time.now.to_s}--#{login}--") if new_record?
      self.crypted_password = encrypt(password)
    end

    def password_required?
      crypted_password.blank? || !password.blank?
    end
end