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 is another example of how to do it, inspired by Simon's code, but a bit shorter and a bit less hacky:

# application_controller.rb
class ApplicationController < ActionController::Base
  # ...

  # When the format is iphone have it also fallback on :html
  append_view_path ExtensionFallbackResolver.new("app/views", :iphone => :html)

  # ...
end

and somewhere in an autoload_path or explicitly required:

# extension_fallback_resolver.rb
class ExtensionFallbackResolver < ActionView::FileSystemResolver

  attr_reader :format_fallbacks

  # In controller do append_view_path ExtensionFallbackResolver.new("app/views", :iphone => :html)
  def initialize(path, format_fallbacks = {})
    super(path)
    @format_fallbacks = format_fallbacks
  end

  private

    def find_templates(name, prefix, partial, details)
      fallback_details = details.dup
      fallback_details[:formats] = Array(format_fallbacks[details[:formats].first])

      path = build_path(name, prefix, partial, details)
      query(path, EXTENSION_ORDER.map { |ext| fallback_details[ext] }, details[:formats])
    end

end

The above is still a hack because it is using a private API, but possibly less fragile as Simon's original proposal.

Note that you need to take care of the layout seperately. You will need to implement a method that chooses the layout based on the user agent or something similar. The will only take care of the fallback for the normal templates.