Rails URL generator switch http / https

Question

Is there a way to put in links to external resources that automatically adds the protocol based on the current protocol?

For example I want to show images from Facebook's Graph API. I was hoping I could do something like:

image_tag url_for("/1234567/picture", :host => "graph.facebook.com")

So that the url_for just bases the protocol on the current request's protocol.

I know this works but I'm hoping there's a better way:

image_tag("#{request.protocol}://graph.facebook.com/1234567/picture")

Answer 1

You can add the protocol option to url_for.

image_tag url_for("/1234567/picture", :host => 'graph.facebook.com', :protocol => request.protocol)

or maybe a better way would be to create a helper (if you do this a lot) called url_for_same_protocol (or whatever you want):

class ApplicationHelper
  def url_for_same_protocol(url, options)
    options[:protocol] ||= request.protocol
    url_for url, options
  end
end

.. and then just replace your url_for call with url_for_same_protocol.