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$ rails new User_Auth -d mysql

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class CreateUsers < ActiveRecord::Migration
  def change
    create_table :users do |t|
      t.string :username 
      t.string :email
      t.string :encrypted_password 
      t.string :salt
      t.timestamps
    end
  end

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$ rake db:create
$ rake db:migrate

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gem 'bcrypt-ruby', :require => 'bcrypt' 

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$ rails cd ./User_Auth
$ rails g model user
$ rails g controller users new

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<% @page_title = "UserAuth | Signup" %>
<div class="Sign_Form">
  <h1>Sign Up</h1>
  <%= form_for(:user, :url => {:controller => 'users', :action => 'create'}) do |f| %>
    <p> Username:</br> <%= f.text_field :username%> </p>
    <p> Email:</br> <%= f.text_field :email%> </p>
    <p> Password:</br> <%= f.password_field :password%></p>
    <p> Password Confirmation:</br> <%= f.password_field :password_confirmation%> </p>
    <%= f.submit :Signup %>
  <% end %>

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require 'digest/sha1'
encrypted_password= Digest::SHA1.hexdigest(password)

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salt= Digest::SHA1.hexdigest("# We add {email} as unique value and #{Time.now} as random value")
encrypted_password= Digest::SHA1.hexdigest("Adding #{salt} to {password}")

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class User < ActiveRecord::Base
  attr_accessor :password
  EMAIL_REGEX = /^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i
  validates :username, :presence => true, :uniqueness => true, :length => { :in => 3..20 }
  validates :email, :presence => true, :uniqueness => true, :format => EMAIL_REGEX
  validates :password, :confirmation => true #password_confirmation attr
  validates_length_of :password, :in => 6..20, :on => :create
end

kelhusseiny

class UsersController < ApplicationController  
  def new
    @user = User.new 
  end
  def create
    @user = User.new(params[:user])
    if @user.save
      flash[:notice] = "You signed up successfully"
      flash[:color]= "valid"
    else