Creating excel file with ruby on rails

[Nick Brutyn]

hey,

i want to create a excel file with ruby on rails and send that file to the 
browser (excel file must be supporting all versions)

this is what i have so fare, i cant send it to the server, anyone any 
sollutions

def export_excel
	if @request.env['HTTP_USER_AGENT'] =~ /msie/i
		@headers['Pragma'] = ''
		@headers['Cache-Control'] = ''
	else
		@headers['Pragma'] = 'no-cache'
		@headers['Cache-Control'] = 'no-cache, must-revalidate'
	end

	@employee_id = @params["employee_id"]
	@geotag_id = @params["geotag_id"]
	firm_id = @session[:user].id
	corrected_server_date = (Time.now).strftime('%Y-%m-%d 00:00:00')
	@time_entries = TimeEntry.find(:all, :conditions =>["time_entries.firm_id = 
? AND employee_id like ? and geotag_id like ?", firm_id, 
"%#{@employee_id}%", "%#{@geotag_id}%"], :order => "time_entries.start_time 
DESC", :include=>[:employee,:geotag])


	wb = Excel.new("test/timesheets.xls")
	version = Excel::VERSION

	# Preferred way to add a format
	f1 = wb.add_format(:color=>"black",:bold=>1,:italic=>true)

	f4 = Format.new(:num_format => "d mmm yyyy")
	f5 = Format.new(:num_format => 0x0f)
	wb.add_format(f4)
	wb.add_format(f5)

	ws1 = wb.add_worksheet("timesheets")
	#headers
	@header = ['Employee','Address','Zip','City','Duration','Start','Stop']
	#headers afprinten op de 1ste rij
	0.upto(@header.length - 1) do |i|
		ws1.write(0,i, at header[i], f1)
	end

	rij = 1 #de gegevens worden getoond vanaf de 2de rij
	#time entries afprinten
	 for time_entry in @time_entries
		ws1.write(rij,0,time_entry.employee.last_name + " " + 
time_entry.employee.first_name)
		ws1.write(rij,1,time_entry.geotag.address1)
		ws1.write(rij,2,time_entry.geotag.zip)
		ws1.write(rij,3,time_entry.geotag.city)

		if time_entry.stop_time.nil?
			ws1.write(rij,4,"")
			ws1.write(rij,5,time_entry.start_time.strftime("%d/%m/%Y %H:%M"))
			ws1.write(rij,6,"")
		else
			ws1.write(rij,4,time_entry.duration)
			ws1.write(rij,5,time_entry.start_time.strftime("%d/%m/%Y %H:%M"))
			ws1.write(rij,6,time_entry.stop_time.strftime("%d/%m/%Y %H:%M"))
		end

		rij = rij + 1
	 end
	ws1.format_column(0..1,20,f1)
	ws1.format_column(2,5,f1)
	ws1.format_column(3..4,10,f1)
	ws1.format_column(5..6,15,f1)
	wb.close

	redirect_to :action=>"list_times"
end