respond_with

needs to be paired with respond_to

Needs to be paired with respond_to at the top of your class.

class MyController < ApplicationController
  respond_to :js, :html

Undocumented :location option

You can use undocumented :location option to override where respond_to sends if resource is valid, e.g. to redirect to products index page instead of a specific product’s page, use:

respond_with(@product, :location => products_url)  

RailsCast about Responders

See Ryan Bate’s excellent RailsCast #224 about Responders in Rails 3.x: http://asciicasts.com/episodes/224-controllers-in-rails-3

Alternitive to to add flash to respond with

This is a nice way to add flash if you don’t have a any logic that needs to go around your flash.

def destroy
  @current_user_session.destroy
  respond_with @current_user_session do |format|
    format.html {redirect_to login_path, notice: "You have been logged out"}
  end
end