The list game_classes page used to work, with sortable tables. It used a partial for the table body (header was in the index). Added pagination, better sortable tables, and a search field via several railscasts. I started to add ajaxification to all of the elements. Each intended change worked, so I am unsure where I introduced the error. Now th…

_game_class.html.erb

<table class="pretty">
<thead>
  <tr>
    <th><%= sortable "name" %></th>
    <th>Description</th>
    <th><%= sortable "game_id" %></th>
    <th></th>
    <th></th>
    <th></th>
    </tr>
</thead>
<tbody id="game_classes">
  <tr>
    <td><%= game_class.name %></td>
    <td><%= game_class.description %></td>
    <td><%= game_class.game_id %></td>
    <td><%= link_to 'Show', game_class %></td>
    <td><%= link_to 'Edit', edit_game_class_path(game_class) %></td>
    <td><%= link_to 'Destroy', game_class, method: :delete, data: { confirm: 'Are you sure?' } %></td>
  </tr>
</tbody>
</table>

<div id="paginator">
	<%= paginate @game_classes %>
</div> 

application_helper.rb

module ApplicationHelper
  
  def sortable(column, title = nil)
    title ||= column.titleize
    css_class = column == sort_column ? "current #{sort_direction}" : nil
    direction = column == sort_column && sort_direction == "asc" ? "desc" : "asc"
    link_to title, params.merge(:sort => column, :direction => direction, :page => nil), {:class => css_class}
  end
end

game_class.rb

class GameClass < ActiveRecord::Base
  attr_accessible :description, :name, :game_id
  belongs_to :game
  
  validates_presence_of :name
  validates_presence_of :description
  validates_presence_of :game_id
    
  validates :name, :uniqueness => { :scope => :game_id, :message => "of a class may not be duplicated within a game!!" }

  def self.search(search)
    if search
      where('name LIKE ?', "%#{search}%")
    else
      scoped  
    end
  end
end

game_classes_controller.rb

class GameClassesController < ApplicationController
  # GET /game_classes
  # GET /game_classes.json
  
  # added to allow controller to generate parameters if not present. railscast 228
  helper_method :sort_column, :sort_direction 
  
    def index
    @game_classes = GameClass.search(params[:search]).order(sort_column + ' ' + sort_direction).page(params[:page]).per(10)

    respond_to do |format|
      format.html # index.html.erb
      format.json { render json: @game_classes }
    end
  end
  
  # Methods to set sort peramiters securely (checking whats in the query string)
  private
  def sort_column
    GameClass.column_names.include?(params[:sort]) ? params[:sort] : "name"
  end
  
  def sort_direction
     %w[asc desc].include?(params[:direction]) ?  params[:direction] : "asc"
  end

index.html.erb

<h1>Listing game_classes</h1>

<%= form_tag game_classes_path, :method => 'get' do %>
  <p>
    <%= text_field_tag :search, params[:search] %>
  	<%= submit_tag "Search", :name => nil %>
  	<%= hidden_field_tag :direction, params[:direction] %>
  	<%= hidden_field_tag :sort, params[:sort] %>
  </p>
<%- end %>
foo
<div id="game_classes"><%= render @game_classes %></div>
bah
<p><%= link_to "New Class", new_game_class_path %></p>