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import datetime
from decimal import Decimal
from django.db.models import (
Avg,
Case,
Count,
Exists,
F,
Max,
OuterRef,
Q,
StdDev,
Subquery,
Sum,
Variance,
When,
)
from django.test import TestCase
from django.test.utils import Approximate
from .models import Author, Book, Publisher
class FilteredAggregateTests(TestCase):
@classmethod
def setUpTestData(cls):
cls.a1 = Author.objects.create(name="test", age=40)
cls.a2 = Author.objects.create(name="test2", age=60)
cls.a3 = Author.objects.create(name="test3", age=100)
cls.p1 = Publisher.objects.create(
name="Apress", num_awards=3, duration=datetime.timedelta(days=1)
)
cls.b1 = Book.objects.create(
isbn="159059725",
name="The Definitive Guide to Django: Web Development Done Right",
pages=447,
rating=4.5,
price=Decimal("30.00"),
contact=cls.a1,
publisher=cls.p1,
pubdate=datetime.date(2007, 12, 6),
)
cls.b2 = Book.objects.create(
isbn="067232959",
name="Sams Teach Yourself Django in 24 Hours",
pages=528,
rating=3.0,
price=Decimal("23.09"),
contact=cls.a2,
publisher=cls.p1,
pubdate=datetime.date(2008, 3, 3),
)
cls.b3 = Book.objects.create(
isbn="159059996",
name="Practical Django Projects",
pages=600,
rating=4.5,
price=Decimal("29.69"),
contact=cls.a3,
publisher=cls.p1,
pubdate=datetime.date(2008, 6, 23),
)
cls.a1.friends.add(cls.a2)
cls.a1.friends.add(cls.a3)
cls.b1.authors.add(cls.a1)
cls.b1.authors.add(cls.a3)
cls.b2.authors.add(cls.a2)
cls.b3.authors.add(cls.a3)
def test_filtered_aggregates(self):
agg = Sum("age", filter=Q(name__startswith="test"))
self.assertEqual(Author.objects.aggregate(age=agg)["age"], 200)
def test_filtered_numerical_aggregates(self):
for aggregate, expected_result in (
(Avg, Approximate(66.7, 1)),
(StdDev, Approximate(24.9, 1)),
(Variance, Approximate(622.2, 1)),
):
with self.subTest(aggregate=aggregate.__name__):
agg = aggregate("age", filter=Q(name__startswith="test"))
self.assertEqual(
Author.objects.aggregate(age=agg)["age"], expected_result
)
def test_double_filtered_aggregates(self):
agg = Sum("age", filter=Q(Q(name="test2") & ~Q(name="test")))
self.assertEqual(Author.objects.aggregate(age=agg)["age"], 60)
def test_excluded_aggregates(self):
agg = Sum("age", filter=~Q(name="test2"))
self.assertEqual(Author.objects.aggregate(age=agg)["age"], 140)
def test_related_aggregates_m2m(self):
agg = Sum("friends__age", filter=~Q(friends__name="test"))
self.assertEqual(
Author.objects.filter(name="test").aggregate(age=agg)["age"], 160
)
def test_related_aggregates_m2m_and_fk(self):
q = Q(friends__book__publisher__name="Apress") & ~Q(friends__name="test3")
agg = Sum("friends__book__pages", filter=q)
self.assertEqual(
Author.objects.filter(name="test").aggregate(pages=agg)["pages"], 528
)
def test_plain_annotate(self):
agg = Sum("book__pages", filter=Q(book__rating__gt=3))
qs = Author.objects.annotate(pages=agg).order_by("pk")
self.assertSequenceEqual([a.pages for a in qs], [447, None, 1047])
def test_filtered_aggregate_on_annotate(self):
pages_annotate = Sum("book__pages", filter=Q(book__rating__gt=3))
age_agg = Sum("age", filter=Q(total_pages__gte=400))
aggregated = Author.objects.annotate(total_pages=pages_annotate).aggregate(
summed_age=age_agg
)
self.assertEqual(aggregated, {"summed_age": 140})
def test_case_aggregate(self):
agg = Sum(
Case(When(friends__age=40, then=F("friends__age"))),
filter=Q(friends__name__startswith="test"),
)
self.assertEqual(Author.objects.aggregate(age=agg)["age"], 80)
def test_sum_star_exception(self):
msg = "Star cannot be used with filter. Please specify a field."
with self.assertRaisesMessage(ValueError, msg):
Count("*", filter=Q(age=40))
def test_filtered_reused_subquery(self):
qs = Author.objects.annotate(
older_friends_count=Count("friends", filter=Q(friends__age__gt=F("age"))),
).filter(
older_friends_count__gte=2,
)
self.assertEqual(qs.get(pk__in=qs.values("pk")), self.a1)
def test_filtered_aggregate_ref_annotation(self):
aggs = Author.objects.annotate(double_age=F("age") * 2).aggregate(
cnt=Count("pk", filter=Q(double_age__gt=100)),
)
self.assertEqual(aggs["cnt"], 2)
def test_filtered_aggregate_ref_subquery_annotation(self):
aggs = Author.objects.annotate(
earliest_book_year=Subquery(
Book.objects.filter(
contact__pk=OuterRef("pk"),
)
.order_by("pubdate")
.values("pubdate__year")[:1]
),
).aggregate(
cnt=Count("pk", filter=Q(earliest_book_year=2008)),
)
self.assertEqual(aggs["cnt"], 2)
def test_filtered_aggregate_ref_multiple_subquery_annotation(self):
aggregate = (
Book.objects.values("publisher")
.annotate(
has_authors=Exists(
Book.authors.through.objects.filter(book=OuterRef("pk")),
),
authors_have_other_books=Exists(
Book.objects.filter(
authors__in=Author.objects.filter(
book_contact_set=OuterRef(OuterRef("pk")),
)
).exclude(pk=OuterRef("pk")),
),
)
.aggregate(
max_rating=Max(
"rating",
filter=Q(has_authors=True, authors_have_other_books=False),
)
)
)
self.assertEqual(aggregate, {"max_rating": 4.5})
def test_filtered_aggregate_on_exists(self):
aggregate = Book.objects.values("publisher").aggregate(
max_rating=Max(
"rating",
filter=Exists(
Book.authors.through.objects.filter(book=OuterRef("pk")),
),
),
)
self.assertEqual(aggregate, {"max_rating": 4.5})
def test_filtered_aggregate_empty_condition(self):
book = Book.objects.annotate(
authors_count=Count(
"authors",
filter=Q(authors__in=[]),
),
).get(pk=self.b1.pk)
self.assertEqual(book.authors_count, 0)
aggregate = Book.objects.aggregate(
max_rating=Max("rating", filter=Q(rating__in=[]))
)
self.assertEqual(aggregate, {"max_rating": None})
def test_filtered_aggregate_full_condition(self):
book = Book.objects.annotate(
authors_count=Count(
"authors",
filter=~Q(authors__in=[]),
),
).get(pk=self.b1.pk)
self.assertEqual(book.authors_count, 2)
aggregate = Book.objects.aggregate(
max_rating=Max("rating", filter=~Q(rating__in=[]))
)
self.assertEqual(aggregate, {"max_rating": 4.5})
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