fix lt/lte lookup

Author: timgraham

django_mongodb_backend/base.py

@@ -121,8 +121,10 @@ def _isnull_operator(a, b):
         "gte": lambda a, b: {"$gte": [a, b]},
         # MongoDB considers null less than zero. Exclude null values to match
         # SQL behavior.
-        "lt": lambda a, b: {"$and": [{"$lt": [a, b]}, {"$ne": [a, None]}]},
-        "lte": lambda a, b: {"$and": [{"$lte": [a, b]}, {"$ne": [a, None]}]},
+        "lt": lambda a, b: {"$and": [{"$lt": [a, b]}, DatabaseWrapper._isnull_operator(a, False)]},
+        "lte": lambda a, b: {
+            "$and": [{"$lte": [a, b]}, DatabaseWrapper._isnull_operator(a, False)]
+        },
         "in": lambda a, b: {"$in": [a, b]},
         "isnull": _isnull_operator,
         "range": lambda a, b: {

tests/model_fields_/test_polymorphic_embedded_model.py

@@ -1,6 +1,5 @@
 from datetime import timedelta
 from decimal import Decimal
-from unittest import expectedFailure
 
 from django.core.exceptions import FieldDoesNotExist, ValidationError
 from django.db import models
@@ -122,13 +121,9 @@ def setUpTestData(cls):
     def test_exact(self):
         self.assertCountEqual(Person.objects.filter(pet__weight="3.5"), [self.cat_owners[3]])
 
-    # lt/lte don't exclude nonexistent fields. (In these tests, all Dogs are
-    # also returned since they don't have a weight field.)
-    @expectedFailure
     def test_lt(self):
         self.assertCountEqual(Person.objects.filter(pet__weight__lt="3.5"), self.cat_owners[:3])
 
-    @expectedFailure
     def test_lte(self):
         self.assertCountEqual(Person.objects.filter(pet__weight__lte="3.5"), self.cat_owners[:4])