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Reduce quota calculations on front page

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This commit is contained in:
Raphael Michel
2016-11-08 14:14:10 +01:00
parent 059e6bace5
commit 368d04ae72
2 changed files with 16 additions and 7 deletions
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18
src/pretix/base/models/items.py
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@@ -230,7 +230,7 @@ class Item(LoggedModel):
return False
return True
def check_quotas(self, ignored_quotas=None):
def check_quotas(self, ignored_quotas=None, _cache=None):
"""
This method is used to determine whether this Item is currently available
for sale.
@@ -252,7 +252,7 @@ class Item(LoggedModel):
if self.variations.count() > 0: # NOQA
raise ValueError('Do not call this directly on items which have variations '
'but call this on their ItemVariation objects')
return min([q.availability() for q in check_quotas],
return min([q.availability(_cache=_cache) for q in check_quotas],
key=lambda s: (s[0], s[1] if s[1] is not None else sys.maxsize))
@cached_property
@@ -314,7 +314,7 @@ class ItemVariation(models.Model):
if self.item:
self.item.event.get_cache().clear()
def check_quotas(self, ignored_quotas=None) -> Tuple[int, int]:
def check_quotas(self, ignored_quotas=None, _cache=None) -> Tuple[int, int]:
"""
This method is used to determine whether this ItemVariation is currently
available for sale in terms of quotas.
@@ -330,7 +330,7 @@ class ItemVariation(models.Model):
check_quotas -= set(ignored_quotas)
if not check_quotas:
return Quota.AVAILABILITY_OK, sys.maxsize
return min([q.availability() for q in check_quotas],
return min([q.availability(_cache=_cache) for q in check_quotas],
key=lambda s: (s[0], s[1] if s[1] is not None else sys.maxsize))
def __lt__(self, other):
@@ -533,7 +533,7 @@ class Quota(LoggedModel):
if self.event:
self.event.get_cache().clear()
def availability(self, now_dt: datetime=None) -> Tuple[int, int]:
def availability(self, now_dt: datetime=None, _cache=None) -> Tuple[int, int]:
"""
This method is used to determine whether Items or ItemVariations belonging
to this quota should currently be available for sale.
@@ -541,6 +541,14 @@ class Quota(LoggedModel):
:returns: a tuple where the first entry is one of the ``Quota.AVAILABILITY_`` constants
and the second is the number of available tickets.
"""
if _cache is not None and self.pk in _cache:
return _cache[self.pk]
res = self._availability(now_dt)
if _cache is not None:
_cache[self.pk] = res
return res
def _availability(self, now_dt: datetime=None):
now_dt = now_dt or now()
size_left = self.size
if size_left is None: