gistfile1.rb

def votes_date_range
    return unless check_format
    @version = params[:version]
    @format = params[:format]
    raise ActiveResource::BadRequest.new("Not available in this version") if @version == 'v2'
    ....
end

def bad_request(e)
    @message = e.message
    respond_to do |format|
      format.xml { render :file => "svc/400.xml", :status => 400, :content_type => 'application/xml' }
      format.json { render :file => "svc/400.json", :status => 400, :content_type => 'application/json' }
    end
end