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paperwork: Use window functions for CertificationVersion is_current/is_latest

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This should be a lot more efficient, and is much cleaner code too
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Adam Goldsmith 2023-12-01 13:05:27 -05:00
parent caf8c2cf45
commit a50112c534
1 changed files with 19 additions and 13 deletions
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30
paperwork/models.py
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@ -4,7 +4,8 @@ from typing import TypedDict, TYPE_CHECKING, Optional
from semver import VersionInfo from semver import VersionInfo
from django.db import models from django.db import models
from django.db.models import OuterRef, Q, ExpressionWrapper, Subquery from django.db.models import Q, Window
from django.db.models.functions import FirstValue
from django.conf import settings from django.conf import settings
from django.core.validators import RegexValidator from django.core.validators import RegexValidator
from django_stubs_ext import WithAnnotations from django_stubs_ext import WithAnnotations
@ -139,18 +140,23 @@ class CertificationVersionAnnotations(TypedDict):
class CertificationVersionManager(models.Manager["CertificationVersion"]): class CertificationVersionManager(models.Manager["CertificationVersion"]):
def get_queryset(self) -> models.QuerySet["CertificationVersion"]: def get_queryset(self) -> models.QuerySet["CertificationVersion"]:
qs = super().get_queryset() window = {
latest = qs.filter(definition__pk=OuterRef("definition__pk")).reverse() "partition_by": "definition",
return qs.annotate( "order_by": [
is_latest=ExpressionWrapper( "-major",
Q(pk=Subquery(latest.values("pk")[:1])), "-minor",
output_field=models.BooleanField(), "-patch",
), "-prerelease",
],
}
return (
super()
.get_queryset()
.annotate(
is_latest=Q(pk=Window(FirstValue("pk"), **window)),
# TODO: should do a more correct comparison than just major version # TODO: should do a more correct comparison than just major version
is_current=ExpressionWrapper( is_current=Q(major=Window(FirstValue("major"), **window)),
Q(major=Subquery(latest.values("major")[:1])), )
output_field=models.BooleanField(),
),
) )