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Add clever handling of plus button in cart with voucher (#2893)

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This commit is contained in:
Raphael Michel
2022-11-14 16:55:39 +01:00
committed by GitHub
parent 5b8228bea0
commit e32e7e2a50
4 changed files with 63 additions and 4 deletions
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30
src/pretix/base/services/cart.py
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@@ -195,7 +195,7 @@ class CartManager:
AddOperation = namedtuple('AddOperation', ('count', 'item', 'variation', 'voucher', 'quotas',
'addon_to', 'subevent', 'bundled', 'seat', 'listed_price',
'price_after_voucher', 'custom_price_input',
'custom_price_input_is_net'))
'custom_price_input_is_net', 'voucher_ignored'))
RemoveOperation = namedtuple('RemoveOperation', ('position',))
VoucherOperation = namedtuple('VoucherOperation', ('position', 'voucher', 'price_after_voucher'))
ExtendOperation = namedtuple('ExtendOperation', ('position', 'count', 'item', 'variation', 'voucher',
@@ -330,12 +330,16 @@ class CartManager:
(isinstance(op, self.ExtendOperation) and op.position.is_bundled)
):
if op.item.require_voucher and op.voucher is None:
if getattr(op, 'voucher_ignored', False):
raise CartError(error_messages['voucher_redeemed'])
raise CartError(error_messages['voucher_required'])
if (
(op.item.hide_without_voucher or (op.variation and op.variation.hide_without_voucher)) and
(op.voucher is None or not op.voucher.show_hidden_items)
):
if getattr(op, 'voucher_ignored', False):
raise CartError(error_messages['voucher_redeemed'])
raise CartError(error_messages['voucher_required'])
if not op.item.is_available() or (op.variation and not op.variation.is_available()):
@@ -480,7 +484,7 @@ class CartManager:
self._check_item_constraints(op)
if cp.voucher:
self._voucher_use_diff[cp.voucher] += 1
self._voucher_use_diff[cp.voucher] += 2
self._operations.append(op)
return err
@@ -586,6 +590,7 @@ class CartManager:
item = self._items_cache[i['item']]
variation = self._variations_cache[i['variation']] if i['variation'] is not None else None
voucher = None
voucher_ignored = False
if i.get('voucher'):
try:
@@ -595,6 +600,24 @@ class CartManager:
else:
voucher_use_diff[voucher] += i['count']
if i.get('voucher_ignore_if_redeemed', False):
# This is a special case handling for when a user clicks "+" on an existing line in their cart
# that has a voucher attached. If the voucher still has redemptions left, we'll add another line
# with the same voucher, but if it does not we silently continue as if there was no voucher,
# leading to either a higher-priced ticket or an error. Still, this leads to less error cases
# than either of the possible default assumptions.
predicted_redeemed_after = (
voucher.redeemed +
CartPosition.objects.filter(voucher=voucher, expires__gte=self.now_dt).count() +
self._voucher_use_diff[voucher] +
voucher_use_diff[voucher]
)
if predicted_redeemed_after > voucher.max_usages:
i.pop('voucher')
voucher_ignored = True
voucher = None
voucher_use_diff[voucher] -= i['count']
# Fetch all quotas. If there are no quotas, this item is not allowed to be sold.
quotas = list(item.quotas.filter(subevent=subevent)
if variation is None else variation.quotas.filter(subevent=subevent))
@@ -641,6 +664,7 @@ class CartManager:
price_after_voucher=bundle.designated_price,
custom_price_input=None,
custom_price_input_is_net=False,
voucher_ignored=False,
)
self._check_item_constraints(bop, operations)
bundled.append(bop)
@@ -670,6 +694,7 @@ class CartManager:
price_after_voucher=price_after_voucher,
custom_price_input=custom_price,
custom_price_input_is_net=self.event.settings.display_net_prices,
voucher_ignored=voucher_ignored,
)
self._check_item_constraints(op, operations)
operations.append(op)
@@ -801,6 +826,7 @@ class CartManager:
price_after_voucher=listed_price,
custom_price_input=custom_price,
custom_price_input_is_net=self.event.settings.display_net_prices,
voucher_ignored=False,
)
self._check_item_constraints(op, operations)
operations.append(op)