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Undo with Paper Trail

#255 Undo with Paper Trail

Feb 28, 2011 | 13 minutes | Plugins
Undo and redo behavior is easy to add with a versioning gem such as Paper Trail. Learn how to add an undo link to any model's flash message.
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Resources

bash 
bundle
rails g paper_trail:install
rake db:migrate
rails g controller versions
Gemfile 
gem 'paper_trail'
models/product.rb 
has_paper_trail
products_controller.rb 
def undo_link
  view_context.link_to("undo", revert_version_path(@product.versions.scoped.last), :method => :post)
end
routes.rb 
post "versions/:id/revert" => "versions#revert", :as => "revert_version"
versions_controller.rb 
def revert
  @version = Version.find(params[:id])
  if @version.reify
    @version.reify.save!
  else
    @version.item.destroy
  end
  link_name = params[:redo] == "true" ? "undo" : "redo"
  link = view_context.link_to(link_name, revert_version_path(@version.next, :redo => !params[:redo]), :method => :post)
  redirect_to :back, :notice => "Undid #{@version.event}. #{link}"
end