Fix overwriting project stage.

Author: WaVEV

django_mongodb/compiler.py

@@ -368,8 +368,12 @@ def build_query(self, columns=None):
                 )
                 if not query.aggregation_pipeline:
                     query.aggregation_pipeline = []
-                query.aggregation_pipeline.append({"$group": {"_id": distinct_fields}})
-                query.project_fields = {key: f"$_id.{key}" for key in distinct_fields}
+                query.aggregation_pipeline.extend(
+                    [
+                        {"$group": {"_id": distinct_fields}},
+                        {"$project": {key: f"$_id.{key}" for key in distinct_fields}},
+                    ]
+                )
             else:
                 # Otherwise, project fields without grouping.
                 query.project_fields = self.get_project_fields(columns, ordering_fields)

django_mongodb/features.py

@@ -88,17 +88,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
         "queries.tests.ValuesSubqueryTests.test_values_in_subquery",
         # Wrong results for distinct() queries.
         "admin_filters.tests.ListFiltersTests.test_emptylistfieldfilter_genericrelation",
-        "admin_filters.tests.ListFiltersTests.test_facets_always",
-        "admin_filters.tests.ListFiltersTests.test_facets_disallowed",
         "admin_filters.tests.ListFiltersTests.test_facets_filter",
-        "admin_filters.tests.ListFiltersTests.test_facets_no_filter",
-        "admin_filters.tests.ListFiltersTests.test_relatedonlyfieldlistfilter_foreignkey",
-        "admin_filters.tests.ListFiltersTests.test_relatedonlyfieldlistfilter_foreignkey_default_ordering",
-        "admin_filters.tests.ListFiltersTests.test_relatedonlyfieldlistfilter_foreignkey_ordering",
-        "admin_filters.tests.ListFiltersTests.test_relatedonlyfieldlistfilter_foreignkey_reverse_relationships",
-        "admin_filters.tests.ListFiltersTests.test_relatedonlyfieldlistfilter_manytomany",
-        "admin_filters.tests.ListFiltersTests.test_relatedonlyfieldlistfilter_manytomany_reverse_relationships",
-        "admin_filters.tests.ListFiltersTests.test_relatedonlyfieldlistfilter_underscorelookup_foreignkey",
     }
     # $bitAnd, #bitOr, and $bitXor are new in MongoDB 6.3.
     _django_test_expected_failures_bitwise = {