Beginner/ How to add an email field

[fa00026]

Hello,
I am developing a forum, when a user registers himself he will enter a name, password and an email.

I just need some guidance regarding how to add the email field, of course including the validation.

this is my model
class User < ActiveRecord::Base

validates_presence_of :name
validates_uniqueness_of :name

attr_accessor :password_confirmation
validates_confirmation_of :password

validate :password_non_blank




def self.authenticate(name, password)
user = self.find_by_name(name)
if user
expected_password = encrypted_password(password, user.salt)
if user.hashed_password != expected_password
user = nil
end
end
user
end
# 'password' is a virtual attribute
def password
@password
end

def password=(pwd)
@password = pwd
return if pwd.blank?
create_new_salt
self.hashed_password = User.encrypted_password(self.password, self.salt)
end


private

def password_non_blank
errors.add(:password, "Missing password") if hashed_password.blank?
end

def create_new_salt
self.salt = self.object_id.to_s + rand.to_s
end

def self.encrypted_password(password, salt)
string_to_hash = password + "wibble" + salt
Digest::SHA1.hexdigest(string_to_hash)
end
end

This is my controller

class UsersController < ApplicationController
# GET /users
# GET /users.xml
def index
@users = User.find(:all, :order => :name)

respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => @users }
end
end

# GET /users/1
# GET /users/1.xml
def show
@user = User.find(params[:id])

respond_to do |format|
format.html # show.html.erb
format.xml { render :xml => @user }
end
end

# GET /users/new
# GET /users/new.xml
def new
@user = User.new

respond_to do |format|
format.html # new.html.erb
format.xml { render :xml => @user }
end
end

# GET /users/1/edit
def edit
@user = User.find(params[:id])
end

# POST /users
# POST /users.xml
def create
@user = User.new(params[:user])

respond_to do |format|
if @user.save
flash[:notice] = "User #{@user.name} was successfully created."
format.html { redirect_to(:action=>'index') }
format.xml { render :xml => @user, :status => :created, :location => @user }
else
format.html { render :action => "new" }
format.xml { render :xml => @user.errors, :status => :unprocessable_entity }
end
end
end

# PUT /users/1
# PUT /users/1.xml
def update
@user = User.find(params[:id])

respond_to do |format|
if @user.update_attributes(params[:user])
flash[:notice] = "User #{@user.name} was successfully updated."
format.html { redirect_to(:action=>'index') }
format.xml { head k }
else
format.html { render :action => "edit" }
format.xml { render :xml => @user.errors, :status => :unprocessable_entity }
end
end
end

# DELETE /users/1
# DELETE /users/1.xml
def destroy
@user = User.find(params[:id])
@user.destroy

respond_to do |format|
format.html { redirect_to(users_url) }
format.xml { head k }
end
end
end


this is the edit view[/u]

<h1>Editing users</h1>

<% form_for(@user) do |f| %>
<%= f.error_messages %>

<p>
<%= f.label :name %><br />
<%= f.text_field :name %>
</p>
<p>
<%= f.label :hashed_password %><br />
<%= f.text_field :hashed_password %>
</p>
<p>
<%= f.label :salt %><br />
<%= f.text_field :salt %>
</p>
<p>
<%= f.submit "Update" %>
</p>
<% end %>

This is the new view
<div class="depot-form">

<% form_for(@user) do |f| %>
<%= f.error_messages %>

<fieldset>
<legend>Enter Your Details Please</legend>

<div>
<%= f.label :name %>:
<%= f.text_field :name, :size =>40 %>
</div>

<div>
<%= f.label :user_password, 'Password' %>:
<%= f.password_field :password, :size => 40 %>
</div>

<div>
<%= f.label :user_password_confirmation, 'Confirm' %>:
<%= f.password_field :password_confirmation, :size =>40 %>
</div>

<div>
<%= f.submit "Register me", :class => "submit" %>
</div>

</fieldset>
<% end %>

</div>

And the show view

<p>
<b>Name:</b>
<%=h @user.name %>
</p>

<p>
<b>Hashed password:</b>
<%=h @user.hashed_password %>
</p>

<p>
<b>Salt:</b>
<%=h @user.salt %>
</p>


<%= link_to 'Edit', edit_user_path(@user) %> |
<%= link_to 'Back', users_path %>

What changes shall I add!
Thanks a lot