import datetime import math import re from decimal import Decimal from django.core.exceptions import FieldError from django.db import connection from django.db.models import ( Avg, Case, Count, DateField, DateTimeField, DecimalField, DurationField, Exists, F, FloatField, IntegerField, Max, Min, OuterRef, Q, StdDev, Subquery, Sum, TimeField, Value, Variance, When, ) from django.db.models.expressions import Func, RawSQL from django.db.models.functions import ( Cast, Coalesce, Greatest, Now, Pi, TruncDate, TruncHour, ) from django.test import TestCase from django.test.testcases import skipUnlessDBFeature from django.test.utils import Approximate, CaptureQueriesContext from django.utils import timezone from .models import Author, Book, Publisher, Store class NowUTC(Now): template = 'CURRENT_TIMESTAMP' output_field = DateTimeField() def as_sql(self, compiler, connection, **extra_context): if connection.features.test_now_utc_template: extra_context['template'] = connection.features.test_now_utc_template return super().as_sql(compiler, connection, **extra_context) class AggregateTestCase(TestCase): @classmethod def setUpTestData(cls): cls.a1 = Author.objects.create(name='Adrian Holovaty', age=34) cls.a2 = Author.objects.create(name='Jacob Kaplan-Moss', age=35) cls.a3 = Author.objects.create(name='Brad Dayley', age=45) cls.a4 = Author.objects.create(name='James Bennett', age=29) cls.a5 = Author.objects.create(name='Jeffrey Forcier', age=37) cls.a6 = Author.objects.create(name='Paul Bissex', age=29) cls.a7 = Author.objects.create(name='Wesley J. Chun', age=25) cls.a8 = Author.objects.create(name='Peter Norvig', age=57) cls.a9 = Author.objects.create(name='Stuart Russell', age=46) cls.a1.friends.add(cls.a2, cls.a4) cls.a2.friends.add(cls.a1, cls.a7) cls.a4.friends.add(cls.a1) cls.a5.friends.add(cls.a6, cls.a7) cls.a6.friends.add(cls.a5, cls.a7) cls.a7.friends.add(cls.a2, cls.a5, cls.a6) cls.a8.friends.add(cls.a9) cls.a9.friends.add(cls.a8) cls.p1 = Publisher.objects.create(name='Apress', num_awards=3, duration=datetime.timedelta(days=1)) cls.p2 = Publisher.objects.create(name='Sams', num_awards=1, duration=datetime.timedelta(days=2)) cls.p3 = Publisher.objects.create(name='Prentice Hall', num_awards=7) cls.p4 = Publisher.objects.create(name='Morgan Kaufmann', num_awards=9) cls.p5 = Publisher.objects.create(name="Jonno's House of Books", num_awards=0) 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.a3, publisher=cls.p2, pubdate=datetime.date(2008, 3, 3) ) cls.b3 = Book.objects.create( isbn='159059996', name='Practical Django Projects', pages=300, rating=4.0, price=Decimal('29.69'), contact=cls.a4, publisher=cls.p1, pubdate=datetime.date(2008, 6, 23) ) cls.b4 = Book.objects.create( isbn='013235613', name='Python Web Development with Django', pages=350, rating=4.0, price=Decimal('29.69'), contact=cls.a5, publisher=cls.p3, pubdate=datetime.date(2008, 11, 3) ) cls.b5 = Book.objects.create( isbn='013790395', name='Artificial Intelligence: A Modern Approach', pages=1132, rating=4.0, price=Decimal('82.80'), contact=cls.a8, publisher=cls.p3, pubdate=datetime.date(1995, 1, 15) ) cls.b6 = Book.objects.create( isbn='155860191', name='Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp', pages=946, rating=5.0, price=Decimal('75.00'), contact=cls.a8, publisher=cls.p4, pubdate=datetime.date(1991, 10, 15) ) cls.b1.authors.add(cls.a1, cls.a2) cls.b2.authors.add(cls.a3) cls.b3.authors.add(cls.a4) cls.b4.authors.add(cls.a5, cls.a6, cls.a7) cls.b5.authors.add(cls.a8, cls.a9) cls.b6.authors.add(cls.a8) s1 = Store.objects.create( name='Amazon.com', original_opening=datetime.datetime(1994, 4, 23, 9, 17, 42), friday_night_closing=datetime.time(23, 59, 59) ) s2 = Store.objects.create( name='Books.com', original_opening=datetime.datetime(2001, 3, 15, 11, 23, 37), friday_night_closing=datetime.time(23, 59, 59) ) s3 = Store.objects.create( name="Mamma and Pappa's Books", original_opening=datetime.datetime(1945, 4, 25, 16, 24, 14), friday_night_closing=datetime.time(21, 30) ) s1.books.add(cls.b1, cls.b2, cls.b3, cls.b4, cls.b5, cls.b6) s2.books.add(cls.b1, cls.b3, cls.b5, cls.b6) s3.books.add(cls.b3, cls.b4, cls.b6) def test_empty_aggregate(self): self.assertEqual(Author.objects.all().aggregate(), {}) def test_aggregate_in_order_by(self): msg = ( 'Using an aggregate in order_by() without also including it in ' 'annotate() is not allowed: Avg(F(book__rating)' ) with self.assertRaisesMessage(FieldError, msg): Author.objects.values('age').order_by(Avg('book__rating')) def test_single_aggregate(self): vals = Author.objects.aggregate(Avg("age")) self.assertEqual(vals, {"age__avg": Approximate(37.4, places=1)}) def test_multiple_aggregates(self): vals = Author.objects.aggregate(Sum("age"), Avg("age")) self.assertEqual(vals, {"age__sum": 337, "age__avg": Approximate(37.4, places=1)}) def test_filter_aggregate(self): vals = Author.objects.filter(age__gt=29).aggregate(Sum("age")) self.assertEqual(vals, {'age__sum': 254}) def test_related_aggregate(self): vals = Author.objects.aggregate(Avg("friends__age")) self.assertEqual(vals, {'friends__age__avg': Approximate(34.07, places=2)}) vals = Book.objects.filter(rating__lt=4.5).aggregate(Avg("authors__age")) self.assertEqual(vals, {'authors__age__avg': Approximate(38.2857, places=2)}) vals = Author.objects.all().filter(name__contains="a").aggregate(Avg("book__rating")) self.assertEqual(vals, {'book__rating__avg': 4.0}) vals = Book.objects.aggregate(Sum("publisher__num_awards")) self.assertEqual(vals, {'publisher__num_awards__sum': 30}) vals = Publisher.objects.aggregate(Sum("book__price")) self.assertEqual(vals, {'book__price__sum': Decimal('270.27')}) def test_aggregate_multi_join(self): vals = Store.objects.aggregate(Max("books__authors__age")) self.assertEqual(vals, {'books__authors__age__max': 57}) vals = Author.objects.aggregate(Min("book__publisher__num_awards")) self.assertEqual(vals, {'book__publisher__num_awards__min': 1}) def test_aggregate_alias(self): vals = Store.objects.filter(name="Amazon.com").aggregate(amazon_mean=Avg("books__rating")) self.assertEqual(vals, {'amazon_mean': Approximate(4.08, places=2)}) def test_aggregate_transform(self): vals = Store.objects.aggregate(min_month=Min('original_opening__month')) self.assertEqual(vals, {'min_month': 3}) def test_aggregate_join_transform(self): vals = Publisher.objects.aggregate(min_year=Min('book__pubdate__year')) self.assertEqual(vals, {'min_year': 1991}) def test_annotate_basic(self): self.assertQuerysetEqual( Book.objects.annotate().order_by('pk'), [ "The Definitive Guide to Django: Web Development Done Right", "Sams Teach Yourself Django in 24 Hours", "Practical Django Projects", "Python Web Development with Django", "Artificial Intelligence: A Modern Approach", "Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp" ], lambda b: b.name ) books = Book.objects.annotate(mean_age=Avg("authors__age")) b = books.get(pk=self.b1.pk) self.assertEqual( b.name, 'The Definitive Guide to Django: Web Development Done Right' ) self.assertEqual(b.mean_age, 34.5) def test_annotate_defer(self): qs = Book.objects.annotate( page_sum=Sum("pages")).defer('name').filter(pk=self.b1.pk) rows = [ (self.b1.id, "159059725", 447, "The Definitive Guide to Django: Web Development Done Right") ] self.assertQuerysetEqual( qs.order_by('pk'), rows, lambda r: (r.id, r.isbn, r.page_sum, r.name) ) def test_annotate_defer_select_related(self): qs = Book.objects.select_related('contact').annotate( page_sum=Sum("pages")).defer('name').filter(pk=self.b1.pk) rows = [ (self.b1.id, "159059725", 447, "Adrian Holovaty", "The Definitive Guide to Django: Web Development Done Right") ] self.assertQuerysetEqual( qs.order_by('pk'), rows, lambda r: (r.id, r.isbn, r.page_sum, r.contact.name, r.name) ) def test_annotate_m2m(self): books = Book.objects.filter(rating__lt=4.5).annotate(Avg("authors__age")).order_by("name") self.assertQuerysetEqual( books, [ ('Artificial Intelligence: A Modern Approach', 51.5), ('Practical Django Projects', 29.0), ('Python Web Development with Django', Approximate(30.3, places=1)), ('Sams Teach Yourself Django in 24 Hours', 45.0) ], lambda b: (b.name, b.authors__age__avg), ) books = Book.objects.annotate(num_authors=Count("authors")).order_by("name") self.assertQuerysetEqual( books, [ ('Artificial Intelligence: A Modern Approach', 2), ('Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp', 1), ('Practical Django Projects', 1), ('Python Web Development with Django', 3), ('Sams Teach Yourself Django in 24 Hours', 1), ('The Definitive Guide to Django: Web Development Done Right', 2) ], lambda b: (b.name, b.num_authors) ) def test_backwards_m2m_annotate(self): authors = Author.objects.filter(name__contains="a").annotate(Avg("book__rating")).order_by("name") self.assertQuerysetEqual( authors, [ ('Adrian Holovaty', 4.5), ('Brad Dayley', 3.0), ('Jacob Kaplan-Moss', 4.5), ('James Bennett', 4.0), ('Paul Bissex', 4.0), ('Stuart Russell', 4.0) ], lambda a: (a.name, a.book__rating__avg) ) authors = Author.objects.annotate(num_books=Count("book")).order_by("name") self.assertQuerysetEqual( authors, [ ('Adrian Holovaty', 1), ('Brad Dayley', 1), ('Jacob Kaplan-Moss', 1), ('James Bennett', 1), ('Jeffrey Forcier', 1), ('Paul Bissex', 1), ('Peter Norvig', 2), ('Stuart Russell', 1), ('Wesley J. Chun', 1) ], lambda a: (a.name, a.num_books) ) def test_reverse_fkey_annotate(self): books = Book.objects.annotate(Sum("publisher__num_awards")).order_by("name") self.assertQuerysetEqual( books, [ ('Artificial Intelligence: A Modern Approach', 7), ('Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp', 9), ('Practical Django Projects', 3), ('Python Web Development with Django', 7), ('Sams Teach Yourself Django in 24 Hours', 1), ('The Definitive Guide to Django: Web Development Done Right', 3) ], lambda b: (b.name, b.publisher__num_awards__sum) ) publishers = Publisher.objects.annotate(Sum("book__price")).order_by("name") self.assertQuerysetEqual( publishers, [ ('Apress', Decimal("59.69")), ("Jonno's House of Books", None), ('Morgan Kaufmann', Decimal("75.00")), ('Prentice Hall', Decimal("112.49")), ('Sams', Decimal("23.09")) ], lambda p: (p.name, p.book__price__sum) ) def test_annotate_values(self): books = list(Book.objects.filter(pk=self.b1.pk).annotate(mean_age=Avg("authors__age")).values()) self.assertEqual( books, [ { "contact_id": self.a1.id, "id": self.b1.id, "isbn": "159059725", "mean_age": 34.5, "name": "The Definitive Guide to Django: Web Development Done Right", "pages": 447, "price": Approximate(Decimal("30")), "pubdate": datetime.date(2007, 12, 6), "publisher_id": self.p1.id, "rating": 4.5, } ] ) books = ( Book.objects .filter(pk=self.b1.pk) .annotate(mean_age=Avg('authors__age')) .values('pk', 'isbn', 'mean_age') ) self.assertEqual( list(books), [ { "pk": self.b1.pk, "isbn": "159059725", "mean_age": 34.5, } ] ) books = Book.objects.filter(pk=self.b1.pk).annotate(mean_age=Avg("authors__age")).values("name") self.assertEqual( list(books), [{'name': 'The Definitive Guide to Django: Web Development Done Right'}], ) books = Book.objects.filter(pk=self.b1.pk).values().annotate(mean_age=Avg('authors__age')) self.assertEqual( list(books), [ { "contact_id": self.a1.id, "id": self.b1.id, "isbn": "159059725", "mean_age": 34.5, "name": "The Definitive Guide to Django: Web Development Done Right", "pages": 447, "price": Approximate(Decimal("30")), "pubdate": datetime.date(2007, 12, 6), "publisher_id": self.p1.id, "rating": 4.5, } ] ) books = ( Book.objects .values("rating") .annotate(n_authors=Count("authors__id"), mean_age=Avg("authors__age")) .order_by("rating") ) self.assertEqual( list(books), [ { "rating": 3.0, "n_authors": 1, "mean_age": 45.0, }, { "rating": 4.0, "n_authors": 6, "mean_age": Approximate(37.16, places=1) }, { "rating": 4.5, "n_authors": 2, "mean_age": 34.5, }, { "rating": 5.0, "n_authors": 1, "mean_age": 57.0, } ] ) authors = Author.objects.annotate(Avg("friends__age")).order_by("name") self.assertQuerysetEqual( authors, [ ('Adrian Holovaty', 32.0), ('Brad Dayley', None), ('Jacob Kaplan-Moss', 29.5), ('James Bennett', 34.0), ('Jeffrey Forcier', 27.0), ('Paul Bissex', 31.0), ('Peter Norvig', 46.0), ('Stuart Russell', 57.0), ('Wesley J. Chun', Approximate(33.66, places=1)) ], lambda a: (a.name, a.friends__age__avg) ) def test_count(self): vals = Book.objects.aggregate(Count("rating")) self.assertEqual(vals, {"rating__count": 6}) def test_count_star(self): with self.assertNumQueries(1) as ctx: Book.objects.aggregate(n=Count("*")) sql = ctx.captured_queries[0]['sql'] self.assertIn('SELECT COUNT(*) ', sql) def test_count_distinct_expression(self): aggs = Book.objects.aggregate( distinct_ratings=Count(Case(When(pages__gt=300, then='rating')), distinct=True), ) self.assertEqual(aggs['distinct_ratings'], 4) def test_distinct_on_aggregate(self): for aggregate, expected_result in ( (Avg, 4.125), (Count, 4), (Sum, 16.5), ): with self.subTest(aggregate=aggregate.__name__): books = Book.objects.aggregate(ratings=aggregate('rating', distinct=True)) self.assertEqual(books['ratings'], expected_result) def test_non_grouped_annotation_not_in_group_by(self): """ An annotation not included in values() before an aggregate should be excluded from the group by clause. """ qs = ( Book.objects.annotate(xprice=F('price')).filter(rating=4.0).values('rating') .annotate(count=Count('publisher_id', distinct=True)).values('count', 'rating').order_by('count') ) self.assertEqual(list(qs), [{'rating': 4.0, 'count': 2}]) def test_grouped_annotation_in_group_by(self): """ An annotation included in values() before an aggregate should be included in the group by clause. """ qs = ( Book.objects.annotate(xprice=F('price')).filter(rating=4.0).values('rating', 'xprice') .annotate(count=Count('publisher_id', distinct=True)).values('count', 'rating').order_by('count') ) self.assertEqual( list(qs), [ {'rating': 4.0, 'count': 1}, {'rating': 4.0, 'count': 2}, ] ) def test_fkey_aggregate(self): explicit = list(Author.objects.annotate(Count('book__id'))) implicit = list(Author.objects.annotate(Count('book'))) self.assertCountEqual(explicit, implicit) def test_annotate_ordering(self): books = Book.objects.values('rating').annotate(oldest=Max('authors__age')).order_by('oldest', 'rating') self.assertEqual( list(books), [ {'rating': 4.5, 'oldest': 35}, {'rating': 3.0, 'oldest': 45}, {'rating': 4.0, 'oldest': 57}, {'rating': 5.0, 'oldest': 57}, ] ) books = Book.objects.values("rating").annotate(oldest=Max("authors__age")).order_by("-oldest", "-rating") self.assertEqual( list(books), [ {'rating': 5.0, 'oldest': 57}, {'rating': 4.0, 'oldest': 57}, {'rating': 3.0, 'oldest': 45}, {'rating': 4.5, 'oldest': 35}, ] ) def test_aggregate_annotation(self): vals = Book.objects.annotate(num_authors=Count("authors__id")).aggregate(Avg("num_authors")) self.assertEqual(vals, {"num_authors__avg": Approximate(1.66, places=1)}) def test_avg_duration_field(self): # Explicit `output_field`. self.assertEqual( Publisher.objects.aggregate(Avg('duration', output_field=DurationField())), {'duration__avg': datetime.timedelta(days=1, hours=12)} ) # Implicit `output_field`. self.assertEqual( Publisher.objects.aggregate(Avg('duration')), {'duration__avg': datetime.timedelta(days=1, hours=12)} ) def test_sum_duration_field(self): self.assertEqual( Publisher.objects.aggregate(Sum('duration', output_field=DurationField())), {'duration__sum': datetime.timedelta(days=3)} ) def test_sum_distinct_aggregate(self): """ Sum on a distinct() QuerySet should aggregate only the distinct items. """ authors = Author.objects.filter(book__in=[self.b5, self.b6]) self.assertEqual(authors.count(), 3) distinct_authors = authors.distinct() self.assertEqual(distinct_authors.count(), 2) # Selected author ages are 57 and 46 age_sum = distinct_authors.aggregate(Sum('age')) self.assertEqual(age_sum['age__sum'], 103) def test_filtering(self): p = Publisher.objects.create(name='Expensive Publisher', num_awards=0) Book.objects.create( name='ExpensiveBook1', pages=1, isbn='111', rating=3.5, price=Decimal("1000"), publisher=p, contact_id=self.a1.id, pubdate=datetime.date(2008, 12, 1) ) Book.objects.create( name='ExpensiveBook2', pages=1, isbn='222', rating=4.0, price=Decimal("1000"), publisher=p, contact_id=self.a1.id, pubdate=datetime.date(2008, 12, 2) ) Book.objects.create( name='ExpensiveBook3', pages=1, isbn='333', rating=4.5, price=Decimal("35"), publisher=p, contact_id=self.a1.id, pubdate=datetime.date(2008, 12, 3) ) publishers = Publisher.objects.annotate(num_books=Count("book__id")).filter(num_books__gt=1).order_by("pk") self.assertQuerysetEqual( publishers, ['Apress', 'Prentice Hall', 'Expensive Publisher'], lambda p: p.name, ) publishers = Publisher.objects.filter(book__price__lt=Decimal("40.0")).order_by("pk") self.assertQuerysetEqual( publishers, [ "Apress", "Apress", "Sams", "Prentice Hall", "Expensive Publisher", ], lambda p: p.name ) publishers = ( Publisher.objects .annotate(num_books=Count("book__id")) .filter(num_books__gt=1, book__price__lt=Decimal("40.0")) .order_by("pk") ) self.assertQuerysetEqual( publishers, ['Apress', 'Prentice Hall', 'Expensive Publisher'], lambda p: p.name, ) publishers = ( Publisher.objects .filter(book__price__lt=Decimal("40.0")) .annotate(num_books=Count("book__id")) .filter(num_books__gt=1) .order_by("pk") ) self.assertQuerysetEqual(publishers, ['Apress'], lambda p: p.name) publishers = Publisher.objects.annotate(num_books=Count("book")).filter(num_books__range=[1, 3]).order_by("pk") self.assertQuerysetEqual( publishers, [ "Apress", "Sams", "Prentice Hall", "Morgan Kaufmann", "Expensive Publisher", ], lambda p: p.name ) publishers = Publisher.objects.annotate(num_books=Count("book")).filter(num_books__range=[1, 2]).order_by("pk") self.assertQuerysetEqual( publishers, ['Apress', 'Sams', 'Prentice Hall', 'Morgan Kaufmann'], lambda p: p.name ) publishers = Publisher.objects.annotate(num_books=Count("book")).filter(num_books__in=[1, 3]).order_by("pk") self.assertQuerysetEqual( publishers, ['Sams', 'Morgan Kaufmann', 'Expensive Publisher'], lambda p: p.name, ) publishers = Publisher.objects.annotate(num_books=Count("book")).filter(num_books__isnull=True) self.assertEqual(len(publishers), 0) def test_annotation(self): vals = Author.objects.filter(pk=self.a1.pk).aggregate(Count("friends__id")) self.assertEqual(vals, {"friends__id__count": 2}) books = Book.objects.annotate(num_authors=Count("authors__name")).filter(num_authors__exact=2).order_by("pk") self.assertQuerysetEqual( books, [ "The Definitive Guide to Django: Web Development Done Right", "Artificial Intelligence: A Modern Approach", ], lambda b: b.name ) authors = ( Author.objects .annotate(num_friends=Count("friends__id", distinct=True)) .filter(num_friends=0) .order_by("pk") ) self.assertQuerysetEqual(authors, ['Brad Dayley'], lambda a: a.name) publishers = Publisher.objects.annotate(num_books=Count("book__id")).filter(num_books__gt=1).order_by("pk") self.assertQuerysetEqual(publishers, ['Apress', 'Prentice Hall'], lambda p: p.name) publishers = ( Publisher.objects .filter(book__price__lt=Decimal("40.0")) .annotate(num_books=Count("book__id")) .filter(num_books__gt=1) ) self.assertQuerysetEqual(publishers, ['Apress'], lambda p: p.name) books = ( Book.objects .annotate(num_authors=Count("authors__id")) .filter(authors__name__contains="Norvig", num_authors__gt=1) ) self.assertQuerysetEqual( books, ['Artificial Intelligence: A Modern Approach'], lambda b: b.name ) def test_more_aggregation(self): a = Author.objects.get(name__contains='Norvig') b = Book.objects.get(name__contains='Done Right') b.authors.add(a) b.save() vals = ( Book.objects .annotate(num_authors=Count("authors__id")) .filter(authors__name__contains="Norvig", num_authors__gt=1) .aggregate(Avg("rating")) ) self.assertEqual(vals, {"rating__avg": 4.25}) def test_even_more_aggregate(self): publishers = Publisher.objects.annotate( earliest_book=Min("book__pubdate"), ).exclude(earliest_book=None).order_by("earliest_book").values( 'earliest_book', 'num_awards', 'id', 'name', ) self.assertEqual( list(publishers), [ { 'earliest_book': datetime.date(1991, 10, 15), 'num_awards': 9, 'id': self.p4.id, 'name': 'Morgan Kaufmann' }, { 'earliest_book': datetime.date(1995, 1, 15), 'num_awards': 7, 'id': self.p3.id, 'name': 'Prentice Hall' }, { 'earliest_book': datetime.date(2007, 12, 6), 'num_awards': 3, 'id': self.p1.id, 'name': 'Apress' }, { 'earliest_book': datetime.date(2008, 3, 3), 'num_awards': 1, 'id': self.p2.id, 'name': 'Sams' } ] ) vals = Store.objects.aggregate(Max("friday_night_closing"), Min("original_opening")) self.assertEqual( vals, { "friday_night_closing__max": datetime.time(23, 59, 59), "original_opening__min": datetime.datetime(1945, 4, 25, 16, 24, 14), } ) def test_annotate_values_list(self): books = ( Book.objects .filter(pk=self.b1.pk) .annotate(mean_age=Avg("authors__age")) .values_list("pk", "isbn", "mean_age") ) self.assertEqual(list(books), [(self.b1.id, '159059725', 34.5)]) books = Book.objects.filter(pk=self.b1.pk).annotate(mean_age=Avg("authors__age")).values_list("isbn") self.assertEqual(list(books), [('159059725',)]) books = Book.objects.filter(pk=self.b1.pk).annotate(mean_age=Avg("authors__age")).values_list("mean_age") self.assertEqual(list(books), [(34.5,)]) books = ( Book.objects .filter(pk=self.b1.pk) .annotate(mean_age=Avg("authors__age")) .values_list("mean_age", flat=True) ) self.assertEqual(list(books), [34.5]) books = Book.objects.values_list("price").annotate(count=Count("price")).order_by("-count", "price") self.assertEqual( list(books), [ (Decimal("29.69"), 2), (Decimal('23.09'), 1), (Decimal('30'), 1), (Decimal('75'), 1), (Decimal('82.8'), 1), ] ) def test_dates_with_aggregation(self): """ .dates() returns a distinct set of dates when applied to a QuerySet with aggregation. Refs #18056. Previously, .dates() would return distinct (date_kind, aggregation) sets, in this case (year, num_authors), so 2008 would be returned twice because there are books from 2008 with a different number of authors. """ dates = Book.objects.annotate(num_authors=Count("authors")).dates('pubdate', 'year') self.assertSequenceEqual( dates, [ datetime.date(1991, 1, 1), datetime.date(1995, 1, 1), datetime.date(2007, 1, 1), datetime.date(2008, 1, 1), ], ) def test_values_aggregation(self): # Refs #20782 max_rating = Book.objects.values('rating').aggregate(max_rating=Max('rating')) self.assertEqual(max_rating['max_rating'], 5) max_books_per_rating = Book.objects.values('rating').annotate( books_per_rating=Count('id') ).aggregate(Max('books_per_rating')) self.assertEqual( max_books_per_rating, {'books_per_rating__max': 3}) def test_ticket17424(self): """ Doing exclude() on a foreign model after annotate() doesn't crash. """ all_books = list(Book.objects.values_list('pk', flat=True).order_by('pk')) annotated_books = Book.objects.order_by('pk').annotate(one=Count("id")) # The value doesn't matter, we just need any negative # constraint on a related model that's a noop. excluded_books = annotated_books.exclude(publisher__name="__UNLIKELY_VALUE__") # Try to generate query tree str(excluded_books.query) self.assertQuerysetEqual(excluded_books, all_books, lambda x: x.pk) # Check internal state self.assertIsNone(annotated_books.query.alias_map["aggregation_book"].join_type) self.assertIsNone(excluded_books.query.alias_map["aggregation_book"].join_type) def test_ticket12886(self): """ Aggregation over sliced queryset works correctly. """ qs = Book.objects.all().order_by('-rating')[0:3] vals = qs.aggregate(average_top3_rating=Avg('rating'))['average_top3_rating'] self.assertAlmostEqual(vals, 4.5, places=2) def test_ticket11881(self): """ Subqueries do not needlessly contain ORDER BY, SELECT FOR UPDATE or select_related() stuff. """ qs = Book.objects.all().select_for_update().order_by( 'pk').select_related('publisher').annotate(max_pk=Max('pk')) with CaptureQueriesContext(connection) as captured_queries: qs.aggregate(avg_pk=Avg('max_pk')) self.assertEqual(len(captured_queries), 1) qstr = captured_queries[0]['sql'].lower() self.assertNotIn('for update', qstr) forced_ordering = connection.ops.force_no_ordering() if forced_ordering: # If the backend needs to force an ordering we make sure it's # the only "ORDER BY" clause present in the query. self.assertEqual( re.findall(r'order by (\w+)', qstr), [', '.join(f[1][0] for f in forced_ordering).lower()] ) else: self.assertNotIn('order by', qstr) self.assertEqual(qstr.count(' join '), 0) def test_decimal_max_digits_has_no_effect(self): Book.objects.all().delete() a1 = Author.objects.first() p1 = Publisher.objects.first() thedate = timezone.now() for i in range(10): Book.objects.create( isbn="abcde{}".format(i), name="none", pages=10, rating=4.0, price=9999.98, contact=a1, publisher=p1, pubdate=thedate) book = Book.objects.aggregate(price_sum=Sum('price')) self.assertEqual(book['price_sum'], Decimal("99999.80")) def test_nonaggregate_aggregation_throws(self): with self.assertRaisesMessage(TypeError, 'fail is not an aggregate expression'): Book.objects.aggregate(fail=F('price')) def test_nonfield_annotation(self): book = Book.objects.annotate(val=Max(Value(2))).first() self.assertEqual(book.val, 2) book = Book.objects.annotate(val=Max(Value(2), output_field=IntegerField())).first() self.assertEqual(book.val, 2) book = Book.objects.annotate(val=Max(2, output_field=IntegerField())).first() self.assertEqual(book.val, 2) def test_annotation_expressions(self): authors = Author.objects.annotate(combined_ages=Sum(F('age') + F('friends__age'))).order_by('name') authors2 = Author.objects.annotate(combined_ages=Sum('age') + Sum('friends__age')).order_by('name') for qs in (authors, authors2): self.assertQuerysetEqual( qs, [ ('Adrian Holovaty', 132), ('Brad Dayley', None), ('Jacob Kaplan-Moss', 129), ('James Bennett', 63), ('Jeffrey Forcier', 128), ('Paul Bissex', 120), ('Peter Norvig', 103), ('Stuart Russell', 103), ('Wesley J. Chun', 176) ], lambda a: (a.name, a.combined_ages) ) def test_aggregation_expressions(self): a1 = Author.objects.aggregate(av_age=Sum('age') / Count('*')) a2 = Author.objects.aggregate(av_age=Sum('age') / Count('age')) a3 = Author.objects.aggregate(av_age=Avg('age')) self.assertEqual(a1, {'av_age': 37}) self.assertEqual(a2, {'av_age': 37}) self.assertEqual(a3, {'av_age': Approximate(37.4, places=1)}) def test_avg_decimal_field(self): v = Book.objects.filter(rating=4).aggregate(avg_price=(Avg('price')))['avg_price'] self.assertIsInstance(v, Decimal) self.assertEqual(v, Approximate(Decimal('47.39'), places=2)) def test_order_of_precedence(self): p1 = Book.objects.filter(rating=4).aggregate(avg_price=(Avg('price') + 2) * 3) self.assertEqual(p1, {'avg_price': Approximate(Decimal('148.18'), places=2)}) p2 = Book.objects.filter(rating=4).aggregate(avg_price=Avg('price') + 2 * 3) self.assertEqual(p2, {'avg_price': Approximate(Decimal('53.39'), places=2)}) def test_combine_different_types(self): msg = ( 'Expression contains mixed types: FloatField, DecimalField. ' 'You must set output_field.' ) qs = Book.objects.annotate(sums=Sum('rating') + Sum('pages') + Sum('price')) with self.assertRaisesMessage(FieldError, msg): qs.first() with self.assertRaisesMessage(FieldError, msg): qs.first() b1 = Book.objects.annotate(sums=Sum(F('rating') + F('pages') + F('price'), output_field=IntegerField())).get(pk=self.b4.pk) self.assertEqual(b1.sums, 383) b2 = Book.objects.annotate(sums=Sum(F('rating') + F('pages') + F('price'), output_field=FloatField())).get(pk=self.b4.pk) self.assertEqual(b2.sums, 383.69) b3 = Book.objects.annotate(sums=Sum(F('rating') + F('pages') + F('price'), output_field=DecimalField())).get(pk=self.b4.pk) self.assertEqual(b3.sums, Approximate(Decimal("383.69"), places=2)) def test_complex_aggregations_require_kwarg(self): with self.assertRaisesMessage(TypeError, 'Complex annotations require an alias'): Author.objects.annotate(Sum(F('age') + F('friends__age'))) with self.assertRaisesMessage(TypeError, 'Complex aggregates require an alias'): Author.objects.aggregate(Sum('age') / Count('age')) with self.assertRaisesMessage(TypeError, 'Complex aggregates require an alias'): Author.objects.aggregate(Sum(1)) def test_aggregate_over_complex_annotation(self): qs = Author.objects.annotate( combined_ages=Sum(F('age') + F('friends__age'))) age = qs.aggregate(max_combined_age=Max('combined_ages')) self.assertEqual(age['max_combined_age'], 176) age = qs.aggregate(max_combined_age_doubled=Max('combined_ages') * 2) self.assertEqual(age['max_combined_age_doubled'], 176 * 2) age = qs.aggregate( max_combined_age_doubled=Max('combined_ages') + Max('combined_ages')) self.assertEqual(age['max_combined_age_doubled'], 176 * 2) age = qs.aggregate( max_combined_age_doubled=Max('combined_ages') + Max('combined_ages'), sum_combined_age=Sum('combined_ages')) self.assertEqual(age['max_combined_age_doubled'], 176 * 2) self.assertEqual(age['sum_combined_age'], 954) age = qs.aggregate( max_combined_age_doubled=Max('combined_ages') + Max('combined_ages'), sum_combined_age_doubled=Sum('combined_ages') + Sum('combined_ages')) self.assertEqual(age['max_combined_age_doubled'], 176 * 2) self.assertEqual(age['sum_combined_age_doubled'], 954 * 2) def test_values_annotation_with_expression(self): # ensure the F() is promoted to the group by clause qs = Author.objects.values('name').annotate(another_age=Sum('age') + F('age')) a = qs.get(name="Adrian Holovaty") self.assertEqual(a['another_age'], 68) qs = qs.annotate(friend_count=Count('friends')) a = qs.get(name="Adrian Holovaty") self.assertEqual(a['friend_count'], 2) qs = qs.annotate(combined_age=Sum('age') + F('friends__age')).filter( name="Adrian Holovaty").order_by('-combined_age') self.assertEqual( list(qs), [ { "name": 'Adrian Holovaty', "another_age": 68, "friend_count": 1, "combined_age": 69 }, { "name": 'Adrian Holovaty', "another_age": 68, "friend_count": 1, "combined_age": 63 } ] ) vals = qs.values('name', 'combined_age') self.assertEqual( list(vals), [ {'name': 'Adrian Holovaty', 'combined_age': 69}, {'name': 'Adrian Holovaty', 'combined_age': 63}, ] ) def test_annotate_values_aggregate(self): alias_age = Author.objects.annotate( age_alias=F('age') ).values( 'age_alias', ).aggregate(sum_age=Sum('age_alias')) age = Author.objects.values('age').aggregate(sum_age=Sum('age')) self.assertEqual(alias_age['sum_age'], age['sum_age']) def test_annotate_over_annotate(self): author = Author.objects.annotate( age_alias=F('age') ).annotate( sum_age=Sum('age_alias') ).get(name="Adrian Holovaty") other_author = Author.objects.annotate( sum_age=Sum('age') ).get(name="Adrian Holovaty") self.assertEqual(author.sum_age, other_author.sum_age) def test_aggregate_over_aggregate(self): msg = "Cannot compute Avg('age'): 'age' is an aggregate" with self.assertRaisesMessage(FieldError, msg): Author.objects.annotate( age_alias=F('age'), ).aggregate( age=Sum(F('age')), avg_age=Avg(F('age')), ) def test_annotated_aggregate_over_annotated_aggregate(self): with self.assertRaisesMessage(FieldError, "Cannot compute Sum('id__max'): 'id__max' is an aggregate"): Book.objects.annotate(Max('id')).annotate(Sum('id__max')) class MyMax(Max): def as_sql(self, compiler, connection): self.set_source_expressions(self.get_source_expressions()[0:1]) return super().as_sql(compiler, connection) with self.assertRaisesMessage(FieldError, "Cannot compute Max('id__max'): 'id__max' is an aggregate"): Book.objects.annotate(Max('id')).annotate(my_max=MyMax('id__max', 'price')) def test_multi_arg_aggregate(self): class MyMax(Max): output_field = DecimalField() def as_sql(self, compiler, connection): copy = self.copy() copy.set_source_expressions(copy.get_source_expressions()[0:1]) return super(MyMax, copy).as_sql(compiler, connection) with self.assertRaisesMessage(TypeError, 'Complex aggregates require an alias'): Book.objects.aggregate(MyMax('pages', 'price')) with self.assertRaisesMessage(TypeError, 'Complex annotations require an alias'): Book.objects.annotate(MyMax('pages', 'price')) Book.objects.aggregate(max_field=MyMax('pages', 'price')) def test_add_implementation(self): class MySum(Sum): pass # test completely changing how the output is rendered def lower_case_function_override(self, compiler, connection): sql, params = compiler.compile(self.source_expressions[0]) substitutions = {'function': self.function.lower(), 'expressions': sql, 'distinct': ''} substitutions.update(self.extra) return self.template % substitutions, params setattr(MySum, 'as_' + connection.vendor, lower_case_function_override) qs = Book.objects.annotate( sums=MySum(F('rating') + F('pages') + F('price'), output_field=IntegerField()) ) self.assertEqual(str(qs.query).count('sum('), 1) b1 = qs.get(pk=self.b4.pk) self.assertEqual(b1.sums, 383) # test changing the dict and delegating def lower_case_function_super(self, compiler, connection): self.extra['function'] = self.function.lower() return super(MySum, self).as_sql(compiler, connection) setattr(MySum, 'as_' + connection.vendor, lower_case_function_super) qs = Book.objects.annotate( sums=MySum(F('rating') + F('pages') + F('price'), output_field=IntegerField()) ) self.assertEqual(str(qs.query).count('sum('), 1) b1 = qs.get(pk=self.b4.pk) self.assertEqual(b1.sums, 383) # test overriding all parts of the template def be_evil(self, compiler, connection): substitutions = {'function': 'MAX', 'expressions': '2', 'distinct': ''} substitutions.update(self.extra) return self.template % substitutions, () setattr(MySum, 'as_' + connection.vendor, be_evil) qs = Book.objects.annotate( sums=MySum(F('rating') + F('pages') + F('price'), output_field=IntegerField()) ) self.assertEqual(str(qs.query).count('MAX('), 1) b1 = qs.get(pk=self.b4.pk) self.assertEqual(b1.sums, 2) def test_complex_values_aggregation(self): max_rating = Book.objects.values('rating').aggregate( double_max_rating=Max('rating') + Max('rating')) self.assertEqual(max_rating['double_max_rating'], 5 * 2) max_books_per_rating = Book.objects.values('rating').annotate( books_per_rating=Count('id') + 5 ).aggregate(Max('books_per_rating')) self.assertEqual( max_books_per_rating, {'books_per_rating__max': 3 + 5}) def test_expression_on_aggregation(self): qs = Publisher.objects.annotate( price_or_median=Greatest(Avg('book__rating', output_field=DecimalField()), Avg('book__price')) ).filter(price_or_median__gte=F('num_awards')).order_by('num_awards') self.assertQuerysetEqual( qs, [1, 3, 7, 9], lambda v: v.num_awards) qs2 = Publisher.objects.annotate( rating_or_num_awards=Greatest(Avg('book__rating'), F('num_awards'), output_field=FloatField()) ).filter(rating_or_num_awards__gt=F('num_awards')).order_by('num_awards') self.assertQuerysetEqual( qs2, [1, 3], lambda v: v.num_awards) def test_arguments_must_be_expressions(self): msg = 'QuerySet.aggregate() received non-expression(s): %s.' with self.assertRaisesMessage(TypeError, msg % FloatField()): Book.objects.aggregate(FloatField()) with self.assertRaisesMessage(TypeError, msg % True): Book.objects.aggregate(is_book=True) with self.assertRaisesMessage(TypeError, msg % ', '.join([str(FloatField()), 'True'])): Book.objects.aggregate(FloatField(), Avg('price'), is_book=True) def test_aggregation_subquery_annotation(self): """Subquery annotations are excluded from the GROUP BY if they are not explicitly grouped against.""" latest_book_pubdate_qs = Book.objects.filter( publisher=OuterRef('pk') ).order_by('-pubdate').values('pubdate')[:1] publisher_qs = Publisher.objects.annotate( latest_book_pubdate=Subquery(latest_book_pubdate_qs), ).annotate(count=Count('book')) with self.assertNumQueries(1) as ctx: list(publisher_qs) self.assertEqual(ctx[0]['sql'].count('SELECT'), 2) # The GROUP BY should not be by alias either. self.assertEqual(ctx[0]['sql'].lower().count('latest_book_pubdate'), 1) def test_aggregation_subquery_annotation_exists(self): latest_book_pubdate_qs = Book.objects.filter( publisher=OuterRef('pk') ).order_by('-pubdate').values('pubdate')[:1] publisher_qs = Publisher.objects.annotate( latest_book_pubdate=Subquery(latest_book_pubdate_qs), count=Count('book'), ) self.assertTrue(publisher_qs.exists()) def test_aggregation_exists_annotation(self): published_books = Book.objects.filter(publisher=OuterRef('pk')) publisher_qs = Publisher.objects.annotate( published_book=Exists(published_books), count=Count('book'), ).values_list('name', flat=True) self.assertCountEqual(list(publisher_qs), [ 'Apress', 'Morgan Kaufmann', "Jonno's House of Books", 'Prentice Hall', 'Sams', ]) def test_aggregation_subquery_annotation_values(self): """ Subquery annotations and external aliases are excluded from the GROUP BY if they are not selected. """ books_qs = Book.objects.annotate( first_author_the_same_age=Subquery( Author.objects.filter( age=OuterRef('contact__friends__age'), ).order_by('age').values('id')[:1], ) ).filter( publisher=self.p1, first_author_the_same_age__isnull=False, ).annotate( min_age=Min('contact__friends__age'), ).values('name', 'min_age').order_by('name') self.assertEqual(list(books_qs), [ {'name': 'Practical Django Projects', 'min_age': 34}, { 'name': 'The Definitive Guide to Django: Web Development Done Right', 'min_age': 29, }, ]) def test_aggregation_subquery_annotation_values_collision(self): books_rating_qs = Book.objects.filter( publisher=OuterRef('pk'), price=Decimal('29.69'), ).values('rating') publisher_qs = Publisher.objects.filter( book__contact__age__gt=20, name=self.p1.name, ).annotate( rating=Subquery(books_rating_qs), contacts_count=Count('book__contact'), ).values('rating').annotate(total_count=Count('rating')) self.assertEqual(list(publisher_qs), [ {'rating': 4.0, 'total_count': 2}, ]) @skipUnlessDBFeature('supports_subqueries_in_group_by') def test_aggregation_subquery_annotation_multivalued(self): """ Subquery annotations must be included in the GROUP BY if they use potentially multivalued relations (contain the LOOKUP_SEP). """ subquery_qs = Author.objects.filter( pk=OuterRef('pk'), book__name=OuterRef('book__name'), ).values('pk') author_qs = Author.objects.annotate( subquery_id=Subquery(subquery_qs), ).annotate(count=Count('book')) self.assertEqual(author_qs.count(), Author.objects.count()) def test_aggregation_order_by_not_selected_annotation_values(self): result_asc = [ self.b4.pk, self.b3.pk, self.b1.pk, self.b2.pk, self.b5.pk, self.b6.pk, ] result_desc = result_asc[::-1] tests = [ ('min_related_age', result_asc), ('-min_related_age', result_desc), (F('min_related_age'), result_asc), (F('min_related_age').asc(), result_asc), (F('min_related_age').desc(), result_desc), ] for ordering, expected_result in tests: with self.subTest(ordering=ordering): books_qs = Book.objects.annotate( min_age=Min('authors__age'), ).annotate( min_related_age=Coalesce('min_age', 'contact__age'), ).order_by(ordering).values_list('pk', flat=True) self.assertEqual(list(books_qs), expected_result) @skipUnlessDBFeature('supports_subqueries_in_group_by') def test_group_by_subquery_annotation(self): """ Subquery annotations are included in the GROUP BY if they are grouped against. """ long_books_count_qs = Book.objects.filter( publisher=OuterRef('pk'), pages__gt=400, ).values( 'publisher' ).annotate(count=Count('pk')).values('count') long_books_count_breakdown = Publisher.objects.values_list( Subquery(long_books_count_qs, IntegerField()), ).annotate(total=Count('*')) self.assertEqual(dict(long_books_count_breakdown), {None: 1, 1: 4}) @skipUnlessDBFeature('supports_subqueries_in_group_by') def test_group_by_exists_annotation(self): """ Exists annotations are included in the GROUP BY if they are grouped against. """ long_books_qs = Book.objects.filter( publisher=OuterRef('pk'), pages__gt=800, ) has_long_books_breakdown = Publisher.objects.values_list( Exists(long_books_qs), ).annotate(total=Count('*')) self.assertEqual(dict(has_long_books_breakdown), {True: 2, False: 3}) @skipUnlessDBFeature('supports_subqueries_in_group_by') def test_aggregation_subquery_annotation_related_field(self): publisher = Publisher.objects.create(name=self.a9.name, num_awards=2) book = Book.objects.create( isbn='159059999', name='Test book.', pages=819, rating=2.5, price=Decimal('14.44'), contact=self.a9, publisher=publisher, pubdate=datetime.date(2019, 12, 6), ) book.authors.add(self.a5, self.a6, self.a7) books_qs = Book.objects.annotate( contact_publisher=Subquery( Publisher.objects.filter( pk=OuterRef('publisher'), name=OuterRef('contact__name'), ).values('name')[:1], ) ).filter( contact_publisher__isnull=False, ).annotate(count=Count('authors')) self.assertSequenceEqual(books_qs, [book]) # FIXME: GROUP BY doesn't need to include a subquery with # non-multivalued JOINs, see Col.possibly_multivalued (refs #31150): # with self.assertNumQueries(1) as ctx: # self.assertSequenceEqual(books_qs, [book]) # self.assertEqual(ctx[0]['sql'].count('SELECT'), 2) @skipUnlessDBFeature('supports_subqueries_in_group_by') def test_aggregation_nested_subquery_outerref(self): publisher_with_same_name = Publisher.objects.filter( id__in=Subquery( Publisher.objects.filter( name=OuterRef(OuterRef('publisher__name')), ).values('id'), ), ).values(publisher_count=Count('id'))[:1] books_breakdown = Book.objects.annotate( publisher_count=Subquery(publisher_with_same_name), authors_count=Count('authors'), ).values_list('publisher_count', flat=True) self.assertSequenceEqual(books_breakdown, [1] * 6) def test_aggregation_random_ordering(self): """Random() is not included in the GROUP BY when used for ordering.""" authors = Author.objects.annotate(contact_count=Count('book')).order_by('?') self.assertQuerysetEqual(authors, [ ('Adrian Holovaty', 1), ('Jacob Kaplan-Moss', 1), ('Brad Dayley', 1), ('James Bennett', 1), ('Jeffrey Forcier', 1), ('Paul Bissex', 1), ('Wesley J. Chun', 1), ('Stuart Russell', 1), ('Peter Norvig', 2), ], lambda a: (a.name, a.contact_count), ordered=False) def test_empty_result_optimization(self): with self.assertNumQueries(0): self.assertEqual( Publisher.objects.none().aggregate( sum_awards=Sum('num_awards'), books_count=Count('book'), ), { 'sum_awards': None, 'books_count': 0, } ) # Expression without empty_result_set_value forces queries to be # executed even if they would return an empty result set. raw_books_count = Func('book', function='COUNT') raw_books_count.contains_aggregate = True with self.assertNumQueries(1): self.assertEqual( Publisher.objects.none().aggregate( sum_awards=Sum('num_awards'), books_count=raw_books_count, ), { 'sum_awards': None, 'books_count': 0, } ) def test_coalesced_empty_result_set(self): with self.assertNumQueries(0): self.assertEqual( Publisher.objects.none().aggregate( sum_awards=Coalesce(Sum('num_awards'), 0), )['sum_awards'], 0, ) # Multiple expressions. with self.assertNumQueries(0): self.assertEqual( Publisher.objects.none().aggregate( sum_awards=Coalesce(Sum('num_awards'), None, 0), )['sum_awards'], 0, ) # Nested coalesce. with self.assertNumQueries(0): self.assertEqual( Publisher.objects.none().aggregate( sum_awards=Coalesce(Coalesce(Sum('num_awards'), None), 0), )['sum_awards'], 0, ) # Expression coalesce. with self.assertNumQueries(1): self.assertIsInstance( Store.objects.none().aggregate( latest_opening=Coalesce( Max('original_opening'), RawSQL('CURRENT_TIMESTAMP', []), ), )['latest_opening'], datetime.datetime, ) def test_aggregation_default_unsupported_by_count(self): msg = 'Count does not allow default.' with self.assertRaisesMessage(TypeError, msg): Count('age', default=0) def test_aggregation_default_unset(self): for Aggregate in [Avg, Max, Min, StdDev, Sum, Variance]: with self.subTest(Aggregate): result = Author.objects.filter(age__gt=100).aggregate( value=Aggregate('age'), ) self.assertIsNone(result['value']) def test_aggregation_default_zero(self): for Aggregate in [Avg, Max, Min, StdDev, Sum, Variance]: with self.subTest(Aggregate): result = Author.objects.filter(age__gt=100).aggregate( value=Aggregate('age', default=0), ) self.assertEqual(result['value'], 0) def test_aggregation_default_integer(self): for Aggregate in [Avg, Max, Min, StdDev, Sum, Variance]: with self.subTest(Aggregate): result = Author.objects.filter(age__gt=100).aggregate( value=Aggregate('age', default=21), ) self.assertEqual(result['value'], 21) def test_aggregation_default_expression(self): for Aggregate in [Avg, Max, Min, StdDev, Sum, Variance]: with self.subTest(Aggregate): result = Author.objects.filter(age__gt=100).aggregate( value=Aggregate('age', default=Value(5) * Value(7)), ) self.assertEqual(result['value'], 35) def test_aggregation_default_group_by(self): qs = Publisher.objects.values('name').annotate( books=Count('book'), pages=Sum('book__pages', default=0), ).filter(books=0) self.assertSequenceEqual( qs, [{'name': "Jonno's House of Books", 'books': 0, 'pages': 0}], ) def test_aggregation_default_compound_expression(self): # Scale rating to a percentage; default to 50% if no books published. formula = Avg('book__rating', default=2.5) * 20.0 queryset = Publisher.objects.annotate(rating=formula).order_by('name') self.assertSequenceEqual(queryset.values('name', 'rating'), [ {'name': 'Apress', 'rating': 85.0}, {'name': "Jonno's House of Books", 'rating': 50.0}, {'name': 'Morgan Kaufmann', 'rating': 100.0}, {'name': 'Prentice Hall', 'rating': 80.0}, {'name': 'Sams', 'rating': 60.0}, ]) def test_aggregation_default_using_time_from_python(self): expr = Min( 'store__friday_night_closing', filter=~Q(store__name='Amazon.com'), default=datetime.time(17), ) if connection.vendor == 'mysql': # Workaround for #30224 for MySQL 8.0+ & MariaDB. expr.default = Cast(expr.default, TimeField()) queryset = Book.objects.annotate(oldest_store_opening=expr).order_by('isbn') self.assertSequenceEqual(queryset.values('isbn', 'oldest_store_opening'), [ {'isbn': '013235613', 'oldest_store_opening': datetime.time(21, 30)}, {'isbn': '013790395', 'oldest_store_opening': datetime.time(23, 59, 59)}, {'isbn': '067232959', 'oldest_store_opening': datetime.time(17)}, {'isbn': '155860191', 'oldest_store_opening': datetime.time(21, 30)}, {'isbn': '159059725', 'oldest_store_opening': datetime.time(23, 59, 59)}, {'isbn': '159059996', 'oldest_store_opening': datetime.time(21, 30)}, ]) def test_aggregation_default_using_time_from_database(self): now = timezone.now().astimezone(timezone.utc) expr = Min( 'store__friday_night_closing', filter=~Q(store__name='Amazon.com'), default=TruncHour(NowUTC(), output_field=TimeField()), ) queryset = Book.objects.annotate(oldest_store_opening=expr).order_by('isbn') self.assertSequenceEqual(queryset.values('isbn', 'oldest_store_opening'), [ {'isbn': '013235613', 'oldest_store_opening': datetime.time(21, 30)}, {'isbn': '013790395', 'oldest_store_opening': datetime.time(23, 59, 59)}, {'isbn': '067232959', 'oldest_store_opening': datetime.time(now.hour)}, {'isbn': '155860191', 'oldest_store_opening': datetime.time(21, 30)}, {'isbn': '159059725', 'oldest_store_opening': datetime.time(23, 59, 59)}, {'isbn': '159059996', 'oldest_store_opening': datetime.time(21, 30)}, ]) def test_aggregation_default_using_date_from_python(self): expr = Min('book__pubdate', default=datetime.date(1970, 1, 1)) if connection.vendor == 'mysql': # Workaround for #30224 for MySQL 5.7+ & MariaDB. expr.default = Cast(expr.default, DateField()) queryset = Publisher.objects.annotate(earliest_pubdate=expr).order_by('name') self.assertSequenceEqual(queryset.values('name', 'earliest_pubdate'), [ {'name': 'Apress', 'earliest_pubdate': datetime.date(2007, 12, 6)}, {'name': "Jonno's House of Books", 'earliest_pubdate': datetime.date(1970, 1, 1)}, {'name': 'Morgan Kaufmann', 'earliest_pubdate': datetime.date(1991, 10, 15)}, {'name': 'Prentice Hall', 'earliest_pubdate': datetime.date(1995, 1, 15)}, {'name': 'Sams', 'earliest_pubdate': datetime.date(2008, 3, 3)}, ]) def test_aggregation_default_using_date_from_database(self): now = timezone.now().astimezone(timezone.utc) expr = Min('book__pubdate', default=TruncDate(NowUTC())) queryset = Publisher.objects.annotate(earliest_pubdate=expr).order_by('name') self.assertSequenceEqual(queryset.values('name', 'earliest_pubdate'), [ {'name': 'Apress', 'earliest_pubdate': datetime.date(2007, 12, 6)}, {'name': "Jonno's House of Books", 'earliest_pubdate': now.date()}, {'name': 'Morgan Kaufmann', 'earliest_pubdate': datetime.date(1991, 10, 15)}, {'name': 'Prentice Hall', 'earliest_pubdate': datetime.date(1995, 1, 15)}, {'name': 'Sams', 'earliest_pubdate': datetime.date(2008, 3, 3)}, ]) def test_aggregation_default_using_datetime_from_python(self): expr = Min( 'store__original_opening', filter=~Q(store__name='Amazon.com'), default=datetime.datetime(1970, 1, 1), ) if connection.vendor == 'mysql': # Workaround for #30224 for MySQL 8.0+ & MariaDB. expr.default = Cast(expr.default, DateTimeField()) queryset = Book.objects.annotate(oldest_store_opening=expr).order_by('isbn') self.assertSequenceEqual(queryset.values('isbn', 'oldest_store_opening'), [ {'isbn': '013235613', 'oldest_store_opening': datetime.datetime(1945, 4, 25, 16, 24, 14)}, {'isbn': '013790395', 'oldest_store_opening': datetime.datetime(2001, 3, 15, 11, 23, 37)}, {'isbn': '067232959', 'oldest_store_opening': datetime.datetime(1970, 1, 1)}, {'isbn': '155860191', 'oldest_store_opening': datetime.datetime(1945, 4, 25, 16, 24, 14)}, {'isbn': '159059725', 'oldest_store_opening': datetime.datetime(2001, 3, 15, 11, 23, 37)}, {'isbn': '159059996', 'oldest_store_opening': datetime.datetime(1945, 4, 25, 16, 24, 14)}, ]) def test_aggregation_default_using_datetime_from_database(self): now = timezone.now().astimezone(timezone.utc) expr = Min( 'store__original_opening', filter=~Q(store__name='Amazon.com'), default=TruncHour(NowUTC(), output_field=DateTimeField()), ) queryset = Book.objects.annotate(oldest_store_opening=expr).order_by('isbn') self.assertSequenceEqual(queryset.values('isbn', 'oldest_store_opening'), [ {'isbn': '013235613', 'oldest_store_opening': datetime.datetime(1945, 4, 25, 16, 24, 14)}, {'isbn': '013790395', 'oldest_store_opening': datetime.datetime(2001, 3, 15, 11, 23, 37)}, {'isbn': '067232959', 'oldest_store_opening': now.replace(minute=0, second=0, microsecond=0, tzinfo=None)}, {'isbn': '155860191', 'oldest_store_opening': datetime.datetime(1945, 4, 25, 16, 24, 14)}, {'isbn': '159059725', 'oldest_store_opening': datetime.datetime(2001, 3, 15, 11, 23, 37)}, {'isbn': '159059996', 'oldest_store_opening': datetime.datetime(1945, 4, 25, 16, 24, 14)}, ]) def test_aggregation_default_using_duration_from_python(self): result = Publisher.objects.filter(num_awards__gt=3).aggregate( value=Sum('duration', default=datetime.timedelta(0)), ) self.assertEqual(result['value'], datetime.timedelta(0)) def test_aggregation_default_using_duration_from_database(self): result = Publisher.objects.filter(num_awards__gt=3).aggregate( value=Sum('duration', default=Now() - Now()), ) self.assertEqual(result['value'], datetime.timedelta(0)) def test_aggregation_default_using_decimal_from_python(self): result = Book.objects.filter(rating__lt=3.0).aggregate( value=Sum('price', default=Decimal('0.00')), ) self.assertEqual(result['value'], Decimal('0.00')) def test_aggregation_default_using_decimal_from_database(self): result = Book.objects.filter(rating__lt=3.0).aggregate( value=Sum('price', default=Pi()), ) self.assertAlmostEqual(result['value'], Decimal.from_float(math.pi), places=6) def test_aggregation_default_passed_another_aggregate(self): result = Book.objects.aggregate( value=Sum('price', filter=Q(rating__lt=3.0), default=Avg('pages') / 10.0), ) self.assertAlmostEqual(result['value'], Decimal('61.72'), places=2) def test_exists_none_with_aggregate(self): qs = Book.objects.all().annotate( count=Count('id'), exists=Exists(Author.objects.none()), ) self.assertEqual(len(qs), 6) def test_exists_extra_where_with_aggregate(self): qs = Book.objects.all().annotate( count=Count('id'), exists=Exists(Author.objects.extra(where=['1=0'])), ) self.assertEqual(len(qs), 6)