views.py 文件源码

def print_qr_code(request, user_id, product_id):
    item = Item.objects.get(pk=signer.unsign(product_id))
    qr_filename = str(item.pk) + ".png"
    save = False
    if item.qr_code is None: #new item!
        save = True
        url = "/users/" + str(user_id) + "/found/" + str(product_id)
        uri = request.build_absolute_uri(url)
        item.qr_code = uri
        item.save()
    url = item.qr_code
    qr = QRCode(version=20, error_correction=ERROR_CORRECT_M)
    qr.add_data(url)
    qr.make()
    img = qr.make_image()
    if save:
        img.save(settings.MEDIA_ROOT + qr_filename) #TODO: In production, we have to check where the QR image is being saved
    template_url = settings.MEDIA_URL +  qr_filename
    return render(request, 'lostnfound/qr_code.html', {'qr_url': template_url , 'item': item})

#A user wants to change an item's settings