include none tests for objects.filter

Author: Jibola

tests/expression_converter_/models.py

@@ -0,0 +1,15 @@
+from django.db import models
+
+
+class NullableJSONModel(models.Model):
+    value = models.JSONField(blank=True, null=True)
+
+    class Meta:
+        required_db_features = {"supports_json_field"}
+
+
+class Tag(models.Model):
+    name = models.CharField(max_length=10)
+
+    def __str__(self):
+        return self.name

tests/expression_converter_/test_filter_conversion.py

@@ -0,0 +1,34 @@
+from django.test import TestCase
+
+from django_mongodb_backend.test import MongoTestCaseMixin
+
+from .models import NullableJSONModel, Tag
+
+
+class MQLTests(MongoTestCaseMixin, TestCase):
+    def test_none_filter_nullable_json(self):
+        with self.assertNumQueries(1) as ctx:
+            list(NullableJSONModel.objects.filter(value=None))
+        self.assertAggregateQuery(
+            ctx.captured_queries[0]["sql"],
+            "queries__nullablejsonmodel",
+            [{"$match": {"$and": [{"$exists": False}, {"value": None}]}}],
+        )
+
+    def test_none_filter(self):
+        with self.assertNumQueries(1) as ctx:
+            list(Tag.objects.filter(name=None))
+        self.assertAggregateQuery(
+            ctx.captured_queries[0]["sql"],
+            "queries__nullablejsonmodel",
+            [
+                {
+                    "$match": {
+                        "$or": [
+                            {"$and": [{"name": {"$exists": True}}, {"name": None}]},
+                            {"$expr": {"$eq": [{"$type": "$name"}, "missing"]}},
+                        ]
+                    }
+                }
+            ],
+        )