Rails - Jan 2007 - Best way to force a respond_to format

I am playing around with the idea of adding to the HTTP_ACCEPT header
method and trying to utilize WURFL for detecting mobile devices by
USER_AGENT instead.  I''m thinking I will set up some kind of
before_filter in my controller, to intercept all requests and compare
the USER_AGENT to some data source.

If I detect that the USER_AGENT is a mobile device, then I''d like to
force a particular mime-type and format.  If I can''t find it, then I
may just fall through to the typical ACCEPT header.

I''m wondering what others thoughts are on the best way to do this.

I have found that I can simply set the params[:format] to what I want.

such as:

before_filter :typecheck
def typecheck
  somelogic...
  params[:format] = "xhtmlmp"
  or...
  params[:format] = "wml"
end


Then in my view, I will have a respond_to block something like.

respond_to do |format|
  format.html
  format.xml { :render :xml => @object.to_xml }
  format.xhtmlmp { render :template =>
''object/xhtmlmp-index'',
                                      :layout => ''xhtmlmp''
}
  format.wml { render :template => ''object/wml-index'',
                                :layout => ''wml'' }
end

I see I could also just set the request.env["HTTP_ACCEPT"] parameter
to
the appropriate mime-type that will give me the correct format as well.

Anyone have any suggestions?  Do you think this idea makes any sense?

Thanks for any tips or hints.


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