def print_invoice(request, invoice_id):
invoice_objects = Invoice.objects.prefetch_related('invoiceitem_set')
invoice = get_object_or_404(invoice_objects, pk=invoice_id)
file = 'invoice_' + str(invoice.company) + invoice.period.display
filename = 'filename={}.pdf'.format(
file.replace(".", "").replace(',', '').replace(' ', '_'))
response = HttpResponse(content_type='application/pdf')
response['Content-Disposition'] = filename
doc = SimpleDocTemplate(response,
rightMargin=.6 * cm,
leftMargin=2 * cm,
topMargin=2.75 * cm,
bottomMargin=3 * cm,
pagesize=letter)
elements = invoice.print_invoice_data()
doc.firstname = request.user.first_name
doc.lastname = request.user.last_name
doc.total_amount = invoice.total_amount
doc.build(elements, onFirstPage=footer)
return response
