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Offload more work to database replica

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Raphael Michel
2019-05-05 16:57:54 +02:00
parent 74a6004613
commit 465a5b01b9
7 changed files with 53 additions and 27 deletions
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26
src/pretix/presale/views/event.py
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@@ -50,32 +50,34 @@ def item_group_by_category(items):
def get_grouped_items(event, subevent=None, voucher=None, channel='web'):
items = event.items.filter_available(channel=channel, voucher=voucher).select_related(
items = event.items.using(settings.DATABASE_REPLICA).filter_available(channel=channel, voucher=voucher).select_related(
'category', 'tax_rule', # for re-grouping
).prefetch_related(
Prefetch('quotas',
to_attr='_subevent_quotas',
queryset=event.quotas.filter(subevent=subevent)),
queryset=event.quotas.using(settings.DATABASE_REPLICA).filter(subevent=subevent)),
Prefetch('bundles',
queryset=ItemBundle.objects.prefetch_related(
queryset=ItemBundle.objects.using(settings.DATABASE_REPLICA).prefetch_related(
Prefetch('bundled_item',
queryset=event.items.select_related('tax_rule').prefetch_related(
queryset=event.items.using(settings.DATABASE_REPLICA).select_related('tax_rule').prefetch_related(
Prefetch('quotas',
to_attr='_subevent_quotas',
queryset=event.quotas.filter(subevent=subevent)),
queryset=event.quotas.using(settings.DATABASE_REPLICA).filter(subevent=subevent)),
)),
Prefetch('bundled_variation',
queryset=ItemVariation.objects.select_related('item', 'item__tax_rule').filter(item__event=event).prefetch_related(
queryset=ItemVariation.objects.using(
settings.DATABASE_REPLICA
).select_related('item', 'item__tax_rule').filter(item__event=event).prefetch_related(
Prefetch('quotas',
to_attr='_subevent_quotas',
queryset=event.quotas.filter(subevent=subevent)),
queryset=event.quotas.using(settings.DATABASE_REPLICA).filter(subevent=subevent)),
)),
)),
Prefetch('variations', to_attr='available_variations',
queryset=ItemVariation.objects.filter(active=True, quotas__isnull=False).prefetch_related(
queryset=ItemVariation.objects.using(settings.DATABASE_REPLICA).filter(active=True, quotas__isnull=False).prefetch_related(
Prefetch('quotas',
to_attr='_subevent_quotas',
queryset=event.quotas.filter(subevent=subevent))
queryset=event.quotas.using(settings.DATABASE_REPLICA).filter(subevent=subevent))
).distinct()),
).annotate(
quotac=Count('quotas'),
@@ -229,7 +231,7 @@ class EventIndex(EventViewMixin, EventListMixin, CartMixin, TemplateView):
if request.event.has_subevents:
if 'subevent' in kwargs:
self.subevent = request.event.subevents.filter(pk=kwargs['subevent'], active=True).first()
self.subevent = request.event.subevents.using(settings.DATABASE_REPLICA).filter(pk=kwargs['subevent'], active=True).first()
if not self.subevent:
raise Http404()
return super().get(request, *args, **kwargs)
@@ -287,7 +289,7 @@ class EventIndex(EventViewMixin, EventListMixin, CartMixin, TemplateView):
ebd = defaultdict(list)
add_subevents_for_days(
filter_qs_by_attr(self.request.event.subevents_annotated(self.request.sales_channel), self.request),
filter_qs_by_attr(self.request.event.subevents_annotated(self.request.sales_channel).using(settings.DATABASE_REPLICA), self.request),
before, after, ebd, set(), self.request.event,
kwargs.get('cart_namespace')
)
@@ -297,7 +299,7 @@ class EventIndex(EventViewMixin, EventListMixin, CartMixin, TemplateView):
context['years'] = range(now().year - 2, now().year + 3)
else:
context['subevent_list'] = self.request.event.subevents_sorted(
filter_qs_by_attr(self.request.event.subevents_annotated(self.request.sales_channel), self.request)
filter_qs_by_attr(self.request.event.subevents_annotated(self.request.sales_channel).using(settings.DATABASE_REPLICA), self.request)
)
context['show_cart'] = (