class CreateUsers < ActiveRecord::Migration
       def change
          create_table :users do |t|
             t.string :name
             t.string :email
             t.string :password

             t.timestamps null: false
          end
       end
    end

class User < ActiveRecord::Base
       begin
           attr_accessor :name, :email, :password, :password_confirmation
       end
       validates :name, :presence => true, :uniqueness => true, :length => { :in => 3..20 }
       validates :email, :presence => true, :uniqueness => true
       validates :password, :confirmation => true #password_confirmation attr
       validates_length_of :password, :in => 3..20, :on => :create
   end

class UsersController < ApplicationController
       def login

       end

       def create
           flash[:notice] = ''
           @user=User.new(user_params)
           if @user.valid?
               @user.save
               flash[:notice] = "You signed up successfully"
               render 'users/login'
           else
               flash[:error] = "Form is invalid"
               render 'users/signup'
           end

       end


       def signup
           @user = User.new
           flash[:notice]=''
           flash[:error]=''
       end

   private
       def user_params
             params.require(:user).permit(:name, :email, :password, :password_confirmation)
       end

   end

<div class = "content">
       <h1>Sign Up</h1>
       <p>Maecenas nisi nunc, vulputate ac tempus eget, suscipit ut sapien. Aenean fringilla ultricies ultricies.
Mauris aliquet nunc in velit posuere, in convallis purus ullamcorper.
Nam imperdiet lacus lacus, quis finibus diam dapibus a. Nullam quis accumsan libero. </p>

       <div class = "form_data">
             <%= form_for(:user, :url => {:controller => 'users', :action => 'create'}) do |f| %>
                 <table>
                     <tbody>
                        <tr>
                           <td> Name : </td>
                           <td> <%= f.text_field :name %> </td>
                        </tr>
                        <tr>
                           <td> Email : </td>
                           <td> <%= f.text_field :email %> </td>
                        </tr>
                        <tr>
                           <td> Password : </td>
                           <td> <%= f.password_field :password %> </td>
                        </tr>
                        <tr>
                           <td> Re-type Password : </td>
                           <td> <%= f.password_field :password_confirmation %> </td>
                        </tr>
                        <tr>
                           <td> </td>
                           <td> <%= f.submit :signup %> </td>
                        </tr>

                    </tbody>
                 </table>
             <% end %>

        </div>
        <% flash.each do |name, msg| %>
            <%= content_tag :div, msg, :id => "flash_#{name}" %>
        <% end %>

   </div>