from __future__ import unicode_literals import datetime from decimal import Decimal import re from django.core.exceptions import FieldError from django.db import connection from django.db.models import ( Avg, Sum, Count, Max, Min, Aggregate, F, Value, Func, IntegerField, FloatField, DecimalField) from django.test import TestCase, ignore_warnings from django.test.utils import Approximate from django.test.utils import CaptureQueriesContext from django.utils import six, timezone from django.utils.deprecation import RemovedInDjango20Warning from .models import Author, Publisher, Book, Store class BaseAggregateTestCase(TestCase): fixtures = ["aggregation.json"] def test_empty_aggregate(self): self.assertEqual(Author.objects.all().aggregate(), {}) 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(len(vals), 1) self.assertEqual(vals["age__sum"], 254) def test_related_aggregate(self): vals = Author.objects.aggregate(Avg("friends__age")) self.assertEqual(len(vals), 1) self.assertAlmostEqual(vals["friends__age__avg"], 34.07, places=2) vals = Book.objects.filter(rating__lt=4.5).aggregate(Avg("authors__age")) self.assertEqual(len(vals), 1) self.assertAlmostEqual(vals["authors__age__avg"], 38.2857, places=2) vals = Author.objects.all().filter(name__contains="a").aggregate(Avg("book__rating")) self.assertEqual(len(vals), 1) self.assertEqual(vals["book__rating__avg"], 4.0) vals = Book.objects.aggregate(Sum("publisher__num_awards")) self.assertEqual(len(vals), 1) self.assertEqual(vals["publisher__num_awards__sum"], 30) vals = Publisher.objects.aggregate(Sum("book__price")) self.assertEqual(len(vals), 1) 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(len(vals), 1) self.assertEqual(vals["books__authors__age__max"], 57) vals = Author.objects.aggregate(Min("book__publisher__num_awards")) self.assertEqual(len(vals), 1) 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(len(vals), 1) self.assertAlmostEqual(vals["amazon_mean"], 4.08, places=2) 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=1) 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=1) rows = [ (1, "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=1) rows = [ (1, "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=1).annotate(mean_age=Avg("authors__age")).values()) self.assertEqual( books, [ { "contact_id": 1, "id": 1, "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": 1, "rating": 4.5, } ] ) books = Book.objects.filter(pk=1).annotate(mean_age=Avg('authors__age')).values('pk', 'isbn', 'mean_age') self.assertEqual( list(books), [ { "pk": 1, "isbn": "159059725", "mean_age": 34.5, } ] ) books = Book.objects.filter(pk=1).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=1).values().annotate(mean_age=Avg('authors__age')) self.assertEqual( list(books), [ { "contact_id": 1, "id": 1, "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": 1, "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.assertEqual(len(authors), 9) 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}) vals = Book.objects.aggregate(Count("rating", distinct=True)) self.assertEqual(vals, {"rating__count": 4}) def test_fkey_aggregate(self): explicit = list(Author.objects.annotate(Count('book__id'))) implicit = list(Author.objects.annotate(Count('book'))) self.assertEqual(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_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=1, 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=1, 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=1, 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=1).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() self.assertEqual( list(publishers), [ { 'earliest_book': datetime.date(1991, 10, 15), 'num_awards': 9, 'id': 4, 'name': 'Morgan Kaufmann' }, { 'earliest_book': datetime.date(1995, 1, 15), 'num_awards': 7, 'id': 3, 'name': 'Prentice Hall' }, { 'earliest_book': datetime.date(2007, 12, 6), 'num_awards': 3, 'id': 1, 'name': 'Apress' }, { 'earliest_book': datetime.date(2008, 3, 3), 'num_awards': 1, 'id': 2, '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=1).annotate(mean_age=Avg("authors__age")).values_list("pk", "isbn", "mean_age") self.assertEqual( list(books), [ (1, "159059725", 34.5), ] ) books = Book.objects.filter(pk=1).annotate(mean_age=Avg("authors__age")).values_list("isbn") self.assertEqual( list(books), [ ('159059725',) ] ) books = Book.objects.filter(pk=1).annotate(mean_age=Avg("authors__age")).values_list("mean_age") self.assertEqual( list(books), [ (34.5,) ] ) books = Book.objects.filter(pk=1).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): """ Test that .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.assertQuerysetEqual( 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): """ Check that 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): """ Check that 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): """ Check that 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(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")) class ComplexAggregateTestCase(TestCase): fixtures = ["aggregation.json"] def test_nonaggregate_aggregation_throws(self): with six.assertRaisesRegex(self, 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, output_field=IntegerField())))[0] self.assertEqual(book.val, 2) book = Book.objects.annotate(val=Max(Value(2), output_field=IntegerField()))[0] self.assertEqual(book.val, 2) def test_missing_output_field_raises_error(self): with six.assertRaisesRegex(self, FieldError, 'Cannot resolve expression type, unknown output_field'): Book.objects.annotate(val=Max(Value(2)))[0] 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.assertEqual(len(qs), 9) 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_order_of_precedence(self): p1 = Book.objects.filter(rating=4).aggregate(avg_price=(Avg('price') + 2) * 3) self.assertEqual(p1, {'avg_price': Approximate(148.18, places=2)}) p2 = Book.objects.filter(rating=4).aggregate(avg_price=Avg('price') + 2 * 3) self.assertEqual(p2, {'avg_price': Approximate(53.39, places=2)}) def test_combine_different_types(self): with six.assertRaisesRegex(self, FieldError, 'Expression contains mixed types. You must set output_field'): Book.objects.annotate(sums=Sum('rating') + Sum('pages') + Sum('price')).get(pk=4) b1 = Book.objects.annotate(sums=Sum(F('rating') + F('pages') + F('price'), output_field=IntegerField())).get(pk=4) self.assertEqual(b1.sums, 383) b2 = Book.objects.annotate(sums=Sum(F('rating') + F('pages') + F('price'), output_field=FloatField())).get(pk=4) self.assertEqual(b2.sums, 383.69) b3 = Book.objects.annotate(sums=Sum(F('rating') + F('pages') + F('price'), output_field=DecimalField())).get(pk=4) self.assertEqual(b3.sums, Approximate(Decimal("383.69"), places=2)) def test_complex_aggregations_require_kwarg(self): with six.assertRaisesRegex(self, TypeError, 'Complex expressions require an alias'): Author.objects.annotate(Sum(F('age') + F('friends__age'))) with six.assertRaisesRegex(self, TypeError, 'Complex aggregates require an alias'): Author.objects.aggregate(Sum('age') / Count('age')) 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(pk=1) self.assertEqual(a['another_age'], 68) qs = qs.annotate(friend_count=Count('friends')) a = qs.get(pk=1) self.assertEqual(a['friend_count'], 2) qs = qs.annotate(combined_age=Sum('age') + F('friends__age')).filter(pk=1).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(pk=1) other_author = Author.objects.annotate( sum_age=Sum('age') ).get(pk=1) self.assertEqual(author.sum_age, other_author.sum_age) def test_annotated_aggregate_over_annotated_aggregate(self): with six.assertRaisesRegex(self, FieldError, "Cannot compute Sum\('id__max'\): 'id__max' is an aggregate"): Book.objects.annotate(Max('id')).annotate(Sum('id__max')) def test_add_implementation(self): try: # 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 = dict(function=self.function.lower(), expressions=sql) substitutions.update(self.extra) return self.template % substitutions, params setattr(Sum, 'as_' + connection.vendor, lower_case_function_override) qs = Book.objects.annotate(sums=Sum(F('rating') + F('pages') + F('price'), output_field=IntegerField())) self.assertEqual(str(qs.query).count('sum('), 1) b1 = qs.get(pk=4) 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(Sum, self).as_sql(compiler, connection) setattr(Sum, 'as_' + connection.vendor, lower_case_function_super) qs = Book.objects.annotate(sums=Sum(F('rating') + F('pages') + F('price'), output_field=IntegerField())) self.assertEqual(str(qs.query).count('sum('), 1) b1 = qs.get(pk=4) self.assertEqual(b1.sums, 383) # test overriding all parts of the template def be_evil(self, compiler, connection): substitutions = dict(function='MAX', expressions='2') substitutions.update(self.extra) return self.template % substitutions, () setattr(Sum, 'as_' + connection.vendor, be_evil) qs = Book.objects.annotate(sums=Sum(F('rating') + F('pages') + F('price'), output_field=IntegerField())) self.assertEqual(str(qs.query).count('MAX('), 1) b1 = qs.get(pk=4) self.assertEqual(b1.sums, 2) finally: delattr(Sum, 'as_' + connection.vendor) 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): # Create a plain expression class Greatest(Func): function = 'GREATEST' def as_sqlite(self, compiler, connection): return super(Greatest, self).as_sql(compiler, connection, function='MAX') qs = Publisher.objects.annotate( price_or_median=Greatest(Avg('book__rating'), Avg('book__price')) ).filter(price_or_median__gte=F('num_awards')).order_by('pk') self.assertQuerysetEqual( qs, [1, 2, 3, 4], lambda v: v.pk) 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('pk') self.assertQuerysetEqual( qs2, [1, 2], lambda v: v.pk) @ignore_warnings(category=RemovedInDjango20Warning) def test_backwards_compatibility(self): from django.db.models.sql import aggregates as sql_aggregates class SqlNewSum(sql_aggregates.Aggregate): sql_function = 'SUM' class NewSum(Aggregate): name = 'Sum' def add_to_query(self, query, alias, col, source, is_summary): klass = SqlNewSum aggregate = klass( col, source=source, is_summary=is_summary, **self.extra) query.annotations[alias] = aggregate qs = Author.objects.values('name').annotate(another_age=NewSum('age') + F('age')) a = qs.get(pk=1) self.assertEqual(a['another_age'], 68)