Controller index view with pagination and AJAX search

controller.rb

def index
  @instance = Model.search(params[:search], :include => :associated_model).paginate(:page => params[:page])

  respond_to do |format|
    format.html
    format.js
  end
end

index.html.erb

<div class="searchbox">
  <label for="search">Search:</label><input id="search" type="search" name="search" placeholder="attr1, attr2 or attr3" value="<%= params[:search] %>"/>
  <%= observe_field :search, :url => { :action => :index }, :frequency => 2, :with => "search", :method => "get" %>
</div>

<%= render :partial => 'list_partial' %>

index.js.rjs

page.replace_html :id_of_element_to_replace, :partial => "list_partial"

model.rb

def self.search(search, options = {})
  if search
    words = search.gsub('%', '\\\\\%').split
      
    search_string = words.collect { |word| "(attr1 ILIKE '%#{word}%' OR attr2 ILIKE '%#{word}%' OR attr3 ILIKE '%#{word}%')" }.join " AND "
      
    all(options.merge({ :conditions => sanitize_sql_for_conditions(search_string) }))
  else
    all(options)
  end
end