Can a mobile mime type fall back to “html” in Rails?

Question

I\'m using this code (taken from here) in ApplicationController to detect iPhone, iPod Touch and iPad requests:

before_filter :detect_mobile_request, :detec         


        

Answer 1

Here's a simpler solution:

class ApplicationController
    ...
    def formats=(values)
        values << :html if values == [:mobile]
        super(values)
    end
    ...
end

It turns out Rails (3.2.11) adds an :html fallback for requests with the :js format. Here's how it works:

• ActionController::Rendering#process_action assigns the formats array from the request (see action_controller/metal/rendering.rb)
• ActionView::LookupContext#formats= gets called with the result

Here's ActionView::LookupContext#formats=,

# Override formats= to expand ["*/*"] values and automatically
# add :html as fallback to :js.
def formats=(values)
  if values
    values.concat(default_formats) if values.delete "*/*"
    values << :html if values == [:js]
  end
  super(values)
end

This solution is gross but I don't know a better way to get Rails to interpret a request MIME type of "mobile" as formatters [:mobile, :html] - and Rails already does it this way.