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

I am adding another answer now that we have updated to 3.2.X. Leaving the old answer as it was in case someone needs that one. But, I will edit it to direct people to this one for current versions.

The significant difference here is to make use of the "new" (since 3.1) availability of adding in custom path resolvers. Which does make the code shorter, as Jeroen suggested. But taken a little bit further. In particular the #find_templates is no longer private and it is expected that you will write a custom one.

# lib/fallback_resolver.rb
class FallbackResolver < ::ActionView::FileSystemResolver
  def initialize(path, fallbacks = nil)
    @fallback_list = fallbacks
    super(path)
  end

  def find_templates(name, prefix, partial, details)
    format = details[:formats].first

    return super unless @fallback_list && @fallback_list[format]

    formats = Array.wrap(@fallback_list[format])
    details_copy = details.dup
    details_copy[:formats] = formats
    path = Path.build(name, prefix, partial)
    query(path, details_copy, formats)
  end
end

# app/controllers/application_controller.rb
class ApplicationController < ActionController::Base
  append_view_path 'app/views', {
    mobile: [:sponsor_mobile, :mobile, :sponsor_html, :html],
    html: [:sponsor_html, :html]
  }
  respond_to :html, :mobile

# config/initializers/mime_types.rb
register_alias 'text/html', :mobile