Rails - Jun 2012 - How to set custom type/format in controller's response_to?

Environment
==========
Rails 3.2.6
Ruby 1.9.3p194

What I found
===========
class ThemesController < ApplicationController
  def show
  end
end
This setting will always render the /views/themes/show.html.erb page no
matter what URL extension is. For example:

http://localhost/themes/1.json
http://localhost/themes/1.xxx
http://localhost/themes/1.custom_ext
...

Encounter
========
I want to run render :json=>@theme when extension is json, otherwise,
render the show.html.erb page, so I changed my code:

respond_to do |format|
  format.json { render :json => @theme}
  format.any {render}
end

It will correctly run `render :json=>@theme` when URL extension is
.json,
and render show.html.erb in .xml, .html, etc.

However, I got 406 Not Acceptable in .xxx, .ooo, .custom_ext, and I
found it is because only supported MIME type were allowed.

Temporary solution
=================
class ThemesController < ApplicationController
  def show
    if params[:format].present? && params[:format] == "json"
      render :json => @theme
    end
  end
end

It works fine, and when serving more then 2 formats, such as .xml,
.json, .yaml, etc:

class ThemesController < ApplicationController
  def show
    case params[:format]
    when "json" then render :json => @theme
    when "xml" then render :xml => @theme
    ...
    else render
    end
  end
end

It looks clean and not worse than respond_to style :D

Question
=======
1. I am wondering if there is another better solution?
2. If case statement can do every thing respond_to can do while
respond_to
can''t, why should I use respond_to?

-- 
Posted via http://www.ruby-forum.com/.

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.