registrasion/views.py
def checkout(request, user_id=None):
    ''' Runs the checkout process for the current cart.

    If the query string contains ``fix_errors=true``, Registrasion will attempt
    to fix errors preventing the system from checking out, including by
    cancelling expired discounts and vouchers, and removing any unavailable
    products.

    Arguments:
        user_id (castable to int):
            If the requesting user is staff, then the user ID can be used to
            run checkout for another user.
    Returns:
        render or redirect:
            If the invoice is generated successfully, or there's already a
            valid invoice for the current cart, redirect to ``invoice``.
            If there are errors when generating the invoice, render
            ``registrasion/checkout_errors.html`` with the following data::

                {
                    "error_list", [str, ...]  # The errors to display.
                }

    '''

    if user_id is not None:
        if request.user.is_staff:
            user = User.objects.get(id=int(user_id))
        else:
            raise Http404()
    else:
        user = request.user

    current_cart = CartController.for_user(user)

    if "fix_errors" in request.GET and request.GET["fix_errors"] == "true":
        current_cart.fix_simple_errors()

    try:
        current_invoice = InvoiceController.for_cart(current_cart.cart)
    except ValidationError as ve:
        return _checkout_errors(request, ve)

    return redirect("invoice", current_invoice.invoice.id)
def checkout(request, user_id=None):
    ''' Runs the checkout process for the current cart.

    If the query string contains ``fix_errors=true``, Registrasion will attempt
    to fix errors preventing the system from checking out, including by
    cancelling expired discounts and vouchers, and removing any unavailable
    products.

    Arguments:
        user_id (castable to int):
            If the requesting user is staff, then the user ID can be used to
            run checkout for another user.
    Returns:
        render or redirect:
            If the invoice is generated successfully, or there's already a
            valid invoice for the current cart, redirect to ``invoice``.
            If there are errors when generating the invoice, render
            ``registrasion/checkout_errors.html`` with the following data::

                {
                    "error_list", [str, ...]  # The errors to display.
                }

    '''

    if user_id is not None:
        if request.user.is_staff:
            user = User.objects.get(id=int(user_id))
        else:
            raise Http404()
    else:
        user = request.user

    current_cart = CartController.for_user(user)

    if "fix_errors" in request.GET and request.GET["fix_errors"] == "true":
        current_cart.fix_simple_errors()

    try:
        current_invoice = InvoiceController.for_cart(current_cart.cart)
    except ValidationError as ve:
        return _checkout_errors(request, ve)

    return redirect("invoice", current_invoice.invoice.id)
Runs the checkout process for the current cart.

    If the query string contains ``fix_errors=true``, Registrasion will attempt
    to fix errors preventing the system from checking out, including by
    cancelling expired discounts and vouchers, and removing any unavailable
    products.

    Arguments:
        user_id (castable to int):
            If the requesting user is staff, then the user ID can be used to
            run checkout for another user.
    Returns:
        render or redirect:
            If the invoice is generated successfully, or there's already a
            valid invoice for the current cart, redirect to ``invoice``.
            If there are errors when generating the invoice, render
            ``registrasion/checkout_errors.html`` with the following data::

                {
                    "error_list", [str, ...]  # The errors to display.
                }