Point me to a Rails 4 example with Facebook canvas

Question

I only find examples of old Rails usage of the Facebook canvas app. Especially with the latest changes Facebook made to the API's.

I am a little bit stuck with that. Does anyone now a gem + example or any other information how to use it properly in Rails 4?

Answer 1

I successfully made it running with Koala gem. It provides you special method for parsing signed requests, so you can easily implement fetching data.

Koala::Facebook::OAuth.new('someapp','your_secret).parse_signed_request(params[:signed_request])

Find more info & usage here: https://github.com/arsduo/koala/wiki/OAuth

You may also need to enable iframe for your controllers which can be done like this:

class MyController < ApplicationController
  after_filter :allow_iframe

  private

  def allow_iframe
    response.headers.except! 'X-Frame-Options'
  end
end