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// Structure
rails g scaffold Article name:string approved:boolean

// routes
resources :articles do
  get 'toggle_approve', :on => :member
end

// Article Helper
def approve_link_text(approvable)
  approvable.approved? ? 'Un-approve' : 'Approve'
end

// Article View
<%= link_to approve_link_text(article), toggle_approve_article_path(article), 
  :remote => true %>
(OR)
<% @articles.each do |article| %>
  <%= article.name %>
  <%= link_to approve_link_text(@article), toggle_approve_article_path(@article), 
    :remote => true, 
    :id => "approve_link_#{@article.id}" %>
<% end %>    
  
  
// Article Controller
def toggle_approve  
  @a = Article.find(params[:id])  
  @a.toggle!(:approved)  
  render :nothing => true  
end

// toggle_approve.js.erb.
$("#approve_link_<%= @article.id %>")
  .text("<%= approve_link_text(@article) %>");

$("#article_<%= @article.id %>").effect("highlight");