CGM_Public/pretix_original
2
0
Fork 1
mirror of https://github.com/pretix/pretix.git synced 2026-05-10 16:04:02 +00:00
Code Issues Packages Projects Releases Wiki Activity

Reduce number of redundant SQL queries

Browse Source
This commit is contained in:
Raphael Michel
2016-11-06 19:59:19 +01:00
parent 5aa3ff0616
commit 7b48a17b51
9 changed files with 161 additions and 145 deletions
Download Patch File Download Diff File Expand all files Collapse all files

84
src/pretix/presale/views/event.py
View File

@@ -1,9 +1,11 @@
import sys
from django.db.models import Count, Q
from django.db.models import Count, Prefetch, Q
from django.utils.timezone import now
from django.views.generic import TemplateView
from pretix.base.models import ItemVariation
from . import CartMixin, EventViewMixin
@@ -21,48 +23,56 @@ def item_group_by_category(items):
)
def get_grouped_items(event):
items = event.items.all().filter(
Q(active=True)
& Q(Q(available_from__isnull=True) | Q(available_from__lte=now()))
& Q(Q(available_until__isnull=True) | Q(available_until__gte=now()))
& Q(hide_without_voucher=False)
).select_related(
'category', # for re-grouping
).prefetch_related(
'quotas', 'variations__quotas', 'quotas__event', # for .availability()
Prefetch('variations', to_attr='available_variations',
queryset=ItemVariation.objects.filter(active=True, quotas__isnull=False).distinct()),
).annotate(
quotac=Count('quotas'),
has_variations=Count('variations')
).filter(
quotac__gt=0
).order_by('category__position', 'category_id', 'position', 'name')
display_add_to_cart = False
for item in items:
if not item.has_variations:
item.cached_availability = list(item.check_quotas())
item.order_max = min(item.cached_availability[1]
if item.cached_availability[1] is not None else sys.maxsize,
int(event.settings.max_items_per_order))
item.price = item.default_price
display_add_to_cart = display_add_to_cart or item.order_max > 0
else:
for var in item.available_variations:
var.cached_availability = list(var.check_quotas())
var.order_max = min(var.cached_availability[1]
if var.cached_availability[1] is not None else sys.maxsize,
int(event.settings.max_items_per_order))
display_add_to_cart = display_add_to_cart or var.order_max > 0
var.price = var.default_price if var.default_price is not None else item.default_price
if len(item.available_variations) > 0:
item.min_price = min([v.price for v in item.available_variations])
item.max_price = max([v.price for v in item.available_variations])
items = [item for item in items if len(item.available_variations) > 0 or not item.has_variations]
return items, display_add_to_cart
class EventIndex(EventViewMixin, CartMixin, TemplateView):
template_name = "pretixpresale/event/index.html"
def get_context_data(self, **kwargs):
context = super().get_context_data(**kwargs)
# Fetch all items
items = self.request.event.items.all().filter(
Q(active=True)
& Q(Q(available_from__isnull=True) | Q(available_from__lte=now()))
& Q(Q(available_until__isnull=True) | Q(available_until__gte=now()))
& Q(hide_without_voucher=False)
).select_related(
'category', # for re-grouping
).prefetch_related(
'quotas', 'variations__quotas', 'quotas__event' # for .availability()
).annotate(quotac=Count('quotas')).filter(
quotac__gt=0
).order_by('category__position', 'category_id', 'position', 'name')
display_add_to_cart = False
for item in items:
item.available_variations = list(item.variations.filter(active=True, quotas__isnull=False).distinct())
item.has_variations = item.variations.exists()
if not item.has_variations:
item.cached_availability = list(item.check_quotas())
item.order_max = min(item.cached_availability[1]
if item.cached_availability[1] is not None else sys.maxsize,
int(self.request.event.settings.max_items_per_order))
item.price = item.default_price
display_add_to_cart = display_add_to_cart or item.order_max > 0
else:
for var in item.available_variations:
var.cached_availability = list(var.check_quotas())
var.order_max = min(var.cached_availability[1]
if var.cached_availability[1] is not None else sys.maxsize,
int(self.request.event.settings.max_items_per_order))
display_add_to_cart = display_add_to_cart or var.order_max > 0
var.price = var.default_price if var.default_price is not None else item.default_price
if len(item.available_variations) > 0:
item.min_price = min([v.price for v in item.available_variations])
item.max_price = max([v.price for v in item.available_variations])
items = [item for item in items if len(item.available_variations) > 0 or not item.has_variations]
items, display_add_to_cart = get_grouped_items(self.request.event)
# Regroup those by category
context['items_by_category'] = item_group_by_category(items)