Rails 3.1 Authlogic authentication and validation with remote forms
class UsersController < ApplicationController
  before_filter :require_user
  respond_to :html, :js

  def index
    @users = User.all
  end

  def show
  end

  def create
    @user = User.new(params[:user])

      if @user.save
         respond_with @user, :location => users_url
      else
         flash[:notice]="not saved"
      end
  end

  def destroy
    @user = User.find(params[:id])
    @user.destroy

    respond_with @user, :location => users_url
  end

  def edit
    @user = User.find(params[:id])
    respond_with @user, :location => users_url
  end

  def update
    @user = User.find(params[:id])
    @user.update_attributes(params[:user])

    respond_with @user, :location => users_url
  end
end

<% title "Create New User for Ajax CRUD Test" %>
  <div id="users_count"><%= users_count %></div>
  <div id="users">
    <%= render @users %>
  </div>
  <h3> Add new user below </h3>
  <%= render :partial => 'form' %>

<div id=<%=dom_id(user)%> class="user">
    <strong><%= user.fname %> <%= user.lname %>, <%= user.email %> </strong><br />
    <em><%= user.created_at.strftime('%b %d, %Y at %I:%M %p') %></em>
    <%= link_to "Destroy", user,:remote => true,  :confirm => "Are You Sure?", :method => :delete %>
    <%= link_to "Edit",edit_user_path(user), :remote => true, :action => "edit"%> <br />
  <div id=<%=dom_id(user)%>edit></div>
    <h5>user ID: <%= user.id %></h5>
  </div>

<%= form_for User.new, :remote => true do |f| %>
    <p>
      <%= f.label :fname %><br />
      <%= f.text_field :fname %>
    </p>
    <p>
      <%= f.label :lname %><br />
      <%= f.text_field :lname %>
    </p>

    <p>
      <%= f.label :email %><br />
      <%= f.text_field :email %>
    </p>

    <p>
      <%= f.label :password %><br />
      <%= f.password_field :password %>
    </p>

    <p>
      <%= f.label :password_confirmation %><br />
      <%= f.password_field :password_confirmation %>
    </p>
    <p><%= f.submit %></p>
  <% end %>

$('<%= escape_javascript(render(:partial => @user))%>')
    .appendTo('#users')
    .hide()
    .fadeIn(200)

  $('#new_user')[0].reset()

  $('#users_count').html '<%= users_count %>'