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Raphael Michel
2015-02-14 11:01:59 +01:00
parent 5d2af48732
commit 7f84069f4d
1 changed files with 23 additions and 5 deletions
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src/pretixpresale/views/cart.py
+23 -5
View File
@@ -61,7 +61,7 @@ class CartAdd(EventViewMixin, CartActionMixin, View):
messages.error(self.request, _('Please enter numbers only.'))
return False
if len(items) == 0:
messages.error(self.request, _('You did not select any items.'))
messages.warning(self.request, _('You did not select any items.'))
return False
return items
@@ -71,7 +71,7 @@ class CartAdd(EventViewMixin, CartActionMixin, View):
return redirect(self.get_failure_url())
if sum(i[2] for i in items) > self.request.event.max_items_per_order:
# TODO: Plurals
# TODO: i18n plurals
messages.error(self.request,
_("You cannot select more than %d items per order") % self.event.max_items_per_order)
return redirect(self.get_failure_url())
@@ -81,27 +81,34 @@ class CartAdd(EventViewMixin, CartActionMixin, View):
i.identity: i for i
in Item.objects.filter(
event=self.request.event,
id__in=[i[0] for i in items]
identity__in=[i[0] for i in items]
).prefetch_related("quotas")
}
variations_cache = {
v.identity: v for v
in ItemVariation.objects.filter(
item__event=self.request.event,
id__in=[i[1] for i in items if i[1] is not None]
identity__in=[i[1] for i in items if i[1] is not None]
).select_related("item", "item__event").prefetch_related("quotas", "values", "values__prop")
}
# Process the request itself
msg_some_unavailable = False
for i in items:
# Check whether the specified items are part of what we just fetched from the database
# If they are not, the user supplied item IDs which either do not exist or belong to
# a different event
if i[0] not in items_cache or (i[1] is not None and i[1] not in variations_cache):
messages.error(self.request, _('You selected an item which is not available for sale.'))
return redirect(self.get_failure_url())
item = items_cache[i[0]]
variation = variations_cache[i[1]] if i[1] is not None else None
price = item.check_restrictions() if variation is None else variation.check_restrictions()
# Execute restriction plugins to check whether they (a) change the price or
# (b) make the item/variation unavailable. If neither is the case, check_restriction
# will correctly return the default price
price = item.check_restrictions() if variation is None else variation.check_restrictions()
if price is False:
if not msg_some_unavailable:
msg_some_unavailable = True
@@ -110,6 +117,7 @@ class CartAdd(EventViewMixin, CartActionMixin, View):
'Please see below for details.'))
continue
# Fetch all quotas. If there are no quotas, this item is not allowed to be sold.
quotas = list(item.quotas.all()) if variation is None else list(variation.quotas.all())
if len(quotas) == 0:
if not msg_some_unavailable:
@@ -119,12 +127,16 @@ class CartAdd(EventViewMixin, CartActionMixin, View):
'Please see below for details.'))
continue
# Assume that all quotas allow us to buy i[2] instances of the object
quota_ok = i[2]
try:
for quota in quotas:
# Lock the quota, so no other thread is allowed to perform sales covered by this
# quota while we're doing so.
quota.lock()
avail = quota.availability()
if avail[0] != Quota.AVAILABILITY_OK:
# This quota is sold out/currently unavailable, so do not sell this at all
if not msg_some_unavailable:
msg_some_unavailable = True
messages.error(self.request,
@@ -133,6 +145,8 @@ class CartAdd(EventViewMixin, CartActionMixin, View):
quota_ok = 0
break
elif avail[1] < i[2]:
# This quota is available, but with less than i[2] items left, so we have to
# reduce the number of bought items
if not msg_some_unavailable:
msg_some_unavailable = True
messages.error(self.request,
@@ -140,6 +154,7 @@ class CartAdd(EventViewMixin, CartActionMixin, View):
'the quantity you selected. Please see below for details.'))
quota_ok = min(quota_ok, avail[1])
# Create a CartPosition for as much items as we can
for k in range(quota_ok):
CartPosition.objects.create(
event=self.request.event,
@@ -151,12 +166,15 @@ class CartAdd(EventViewMixin, CartActionMixin, View):
expires=now() + timedelta(minutes=30)
)
except Quota.LockTimeoutException:
# Is raised when there are too many threads asking for quota locks and we were
# unaible to get one
if not msg_some_unavailable:
msg_some_unavailable = True
messages.error(self.request,
_('We were not able to process your request completely as the '
'server was too busy. Please try again.'))
finally:
# Release the locks. This is important ;)
for quota in quotas:
quota.release()