add subqueries tests

Author: timgraham

tests/model_fields_/models.py

@@ -120,3 +120,10 @@ class Author(EmbeddedModel):
 class Book(models.Model):
     name = models.CharField(max_length=100)
     author = EmbeddedModelField(Author)
+
+
+class Library(models.Model):
+    name = models.CharField(max_length=100)
+    books = models.ManyToManyField("Book", related_name="libraries")
+    location = models.CharField(max_length=100, null=True, blank=True)
+    best_seller = models.CharField(max_length=100, null=True, blank=True)

tests/model_fields_/test_embedded_model.py

@@ -2,7 +2,15 @@
 
 from django.core.exceptions import FieldDoesNotExist, ValidationError
 from django.db import models
-from django.db.models import ExpressionWrapper, F, Max, Sum
+from django.db.models import (
+    Exists,
+    ExpressionWrapper,
+    F,
+    Max,
+    OuterRef,
+    Subquery,
+    Sum,
+)
 from django.test import SimpleTestCase, TestCase
 from django.test.utils import isolate_apps
 
@@ -15,6 +23,7 @@
     Book,
     Data,
     Holder,
+    Library,
 )
 from .utils import truncate_ms
 
@@ -214,3 +223,61 @@ class MyModel(models.Model):
             msg,
             "Embedded models must be a subclass of django_mongodb_backend.models.EmbeddedModel.",
         )
+
+class SubqueryExistsTest(TestCase):
+    def setUp(self):
+        # Create test data
+        address1 = Address.objects.create(city="New York", state="NY", zip_code=10001)
+        address2 = Address.objects.create(city="Boston", state="MA", zip_code=20002)
+        author1 = Author.objects.create(name="Alice", age=30, address=address1)
+        author2 = Author.objects.create(name="Bob", age=40, address=address2)
+        book1 = Book.objects.create(name="Book A", author=author1)
+        book2 = Book.objects.create(name="Book B", author=author2)
+        Book.objects.create(name="Book C", author=author2)
+        Book.objects.create(name="Book D", author=author2)
+        Book.objects.create(name="Book E", author=author1)
+
+        library1 = Library.objects.create(
+            name="Central Library", location="Downtown", best_seller="Book A"
+        )
+        library2 = Library.objects.create(
+            name="Community Library", location="Suburbs", best_seller="Book A"
+        )
+
+        # Add books to libraries
+        library1.books.add(book1, book2)
+        library2.books.add(book2)
+
+    def test_exists_subquery(self):
+        subquery = Book.objects.filter(
+            author__name=OuterRef("name"), author__address__city="Boston"
+        )
+        queryset = Author.objects.filter(Exists(subquery))
+
+        self.assertEqual(queryset.count(), 1)
+
+    def test_in_subquery(self):
+        subquery = Author.objects.filter(age__gt=35).values("name")
+        queryset = Book.objects.filter(author__name__in=Subquery(subquery)).order_by("name")
+
+        self.assertEqual(queryset.count(), 3)
+        self.assertQuerySetEqual(queryset, ["Book B", "Book C", "Book D"], lambda book: book.name)
+
+    def test_range_query(self):
+        queryset = Author.objects.filter(age__range=(25, 45)).order_by("name")
+
+        self.assertEqual(queryset.count(), 2)
+        self.assertQuerySetEqual(queryset, ["Alice", "Bob"], lambda author: author.name)
+
+    def test_exists_with_foreign_object(self):
+        subquery = Library.objects.filter(best_seller=OuterRef("name"))
+        queryset = Book.objects.filter(Exists(subquery))
+
+        self.assertEqual(queryset.count(), 1)
+        self.assertEqual(queryset.first().name, "Book A")
+
+    def test_foreign_field_with_ranges(self):
+        queryset = Library.objects.filter(books__author__age__range=(25, 35))
+
+        self.assertEqual(queryset.count(), 1)
+        self.assertEqual(queryset.first().name, "Central Library")