Collection: fix the slow performance when calculating stoken.
We were running a very expensive query instead of the much simpler and more efficient alternative we just introduced.
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@ -17,7 +17,7 @@ from pathlib import Path
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from django.db import models, transaction
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from django.conf import settings
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from django.core.validators import RegexValidator
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from django.db.models import Q
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from django.db.models import Max
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from django.utils.functional import cached_property
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from django.utils.crypto import get_random_string
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@ -56,18 +56,13 @@ class Collection(models.Model):
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@cached_property
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def stoken(self):
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stoken = (
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Stoken.objects.filter(
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Q(collectionitemrevision__item__collection=self) | Q(collectionmember__collection=self)
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)
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.order_by("id")
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.last()
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)
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if stoken is None:
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stoken1 = self.items.aggregate(stoken=Max("revisions__stoken"))["stoken"] or 0
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stoken2 = self.members.aggregate(stoken=Max("stoken"))["stoken"] or 0
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stoken_id = max(stoken1, stoken2)
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if stoken_id == 0:
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raise Exception("stoken is None. Should never happen")
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return stoken.uid
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return Stoken.objects.get(id=stoken_id).uid
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def validate_unique(self, exclude=None):
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super().validate_unique(exclude=exclude)
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