allow order_by() to reference annotations

django_mongodb/compiler.py

@@ -1,4 +1,4 @@
-from django.core.exceptions import EmptyResultSet, FullResultSet
+from django.core.exceptions import EmptyResultSet, FieldDoesNotExist, FullResultSet
 from django.db import DatabaseError, IntegrityError, NotSupportedError
 from django.db.models import NOT_PROVIDED, Count, Expression
 from django.db.models.aggregates import Aggregate
@@ -212,7 +212,7 @@ def _get_ordering(self):
         if not ordering:
             return self.query.standard_ordering
 
-        field_ordering = []
+        column_ordering = []
         for order in ordering:
             if LOOKUP_SEP in order:
                 raise NotSupportedError("Ordering can't span tables on MongoDB (%s)." % order)
@@ -227,8 +227,13 @@ def _get_ordering(self):
             if name == "pk":
                 name = opts.pk.name
 
-            field_ordering.append((opts.get_field(name), ascending))
-        return field_ordering
+            try:
+                column = opts.get_field(name).column
+            except FieldDoesNotExist:
+                # `name` is an annotation in $project.
+                column = name
+            column_ordering.append((column, ascending))
+        return column_ordering
 
     @cached_property
     def collection_name(self):

django_mongodb/features.py

@@ -40,6 +40,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
         "ordering.tests.OrderingTests.test_default_ordering",
         "ordering.tests.OrderingTests.test_default_ordering_by_f_expression",
         "ordering.tests.OrderingTests.test_default_ordering_does_not_affect_group_by",
+        "ordering.tests.OrderingTests.test_order_by_constant_value",
         "ordering.tests.OrderingTests.test_order_by_expr_query_reuse",
         "ordering.tests.OrderingTests.test_order_by_expression_ref",
         "ordering.tests.OrderingTests.test_order_by_f_expression",
@@ -87,7 +88,9 @@ class DatabaseFeatures(BaseDatabaseFeatures):
         # Wrong results in queries with multiple tables.
         "annotations.tests.NonAggregateAnnotationTestCase.test_annotation_aggregate_with_m2o",
         "annotations.tests.NonAggregateAnnotationTestCase.test_annotation_reverse_m2m",
+        "annotations.tests.NonAggregateAnnotationTestCase.test_annotation_with_m2m",
         "annotations.tests.NonAggregateAnnotationTestCase.test_chaining_annotation_filter_with_m2m",
+        "annotations.tests.NonAggregateAnnotationTestCase.test_mti_annotations",
         "lookup.tests.LookupTests.test_lookup_collision",
         "expressions.test_queryset_values.ValuesExpressionsTests.test_values_list_expression",
         "expressions.test_queryset_values.ValuesExpressionsTests.test_values_list_expression_flat",
@@ -102,6 +105,10 @@ class DatabaseFeatures(BaseDatabaseFeatures):
         # pymongo.errors.OperationFailure:  $multiply only supports numeric
         # types, not date. (should be wrapped in DatabaseError).
         "expressions.tests.FTimeDeltaTests.test_invalid_operator",
+        # alias().order_by() doesn't work.
+        "annotations.tests.AliasTests.test_order_by_alias",
+        # annotate() + values_list() + order_by() loses annotated value.
+        "expressions_case.tests.CaseExpressionTests.test_annotate_values_not_in_order_by",
     }
     # $bitAnd, #bitOr, and $bitXor are new in MongoDB 6.3.
     _django_test_expected_failures_bitwise = {
@@ -280,27 +287,18 @@ def django_test_expected_failures(self):
             "annotations.tests.NonAggregateAnnotationTestCase.test_combined_f_expression_annotation_with_aggregation",
             "annotations.tests.NonAggregateAnnotationTestCase.test_full_expression_annotation_with_aggregation",
             "annotations.tests.NonAggregateAnnotationTestCase.test_grouping_by_q_expression_annotation",
+            "annotations.tests.NonAggregateAnnotationTestCase.test_order_by_aggregate",
             "annotations.tests.NonAggregateAnnotationTestCase.test_q_expression_annotation_with_aggregation",
             "defer_regress.tests.DeferRegressionTest.test_basic",
             "defer_regress.tests.DeferRegressionTest.test_defer_annotate_select_related",
             "defer_regress.tests.DeferRegressionTest.test_ticket_16409",
             "expressions.tests.BasicExpressionsTests.test_aggregate_subquery_annotation",
             "expressions.tests.FieldTransformTests.test_month_aggregation",
             "expressions_case.tests.CaseDocumentationExamples.test_conditional_aggregation_example",
+            "model_fields.test_jsonfield.TestQuerying.test_ordering_grouping_by_count",
             # Func not implemented.
             "annotations.tests.NonAggregateAnnotationTestCase.test_custom_functions",
             "annotations.tests.NonAggregateAnnotationTestCase.test_custom_functions_can_ref_other_functions",
-            # FieldDoesNotExist with ordering.
-            "annotations.tests.AliasTests.test_order_by_alias",
-            "annotations.tests.NonAggregateAnnotationTestCase.test_annotation_with_m2m",
-            "annotations.tests.NonAggregateAnnotationTestCase.test_mti_annotations",
-            "annotations.tests.NonAggregateAnnotationTestCase.test_order_by_aggregate",
-            "annotations.tests.NonAggregateAnnotationTestCase.test_order_by_annotation",
-            "expressions.tests.NegatedExpressionTests.test_filter",
-            "expressions_case.tests.CaseExpressionTests.test_annotate_values_not_in_order_by",
-            "expressions_case.tests.CaseExpressionTests.test_order_by_conditional_implicit",
-            "model_fields.test_jsonfield.TestQuerying.test_ordering_grouping_by_count",
-            "ordering.tests.OrderingTests.test_order_by_constant_value",
         },
         "Exists is not supported on MongoDB.": {
             "annotations.tests.NonAggregateAnnotationTestCase.test_annotation_exists_none_query",

django_mongodb/query.py

@@ -72,7 +72,7 @@ def order_by(self, ordering):
         Reorder query results or execution order. Called by compiler during
         query building.
 
-        `ordering` is a list with (field, ascending) tuples or a boolean --
+        `ordering` is a list with (column, ascending) tuples or a boolean --
         use natural ordering, if any, when the argument is True and its reverse
         otherwise.
         """
@@ -81,9 +81,9 @@ def order_by(self, ordering):
             if not ordering:
                 self.ordering.append(("$natural", DESCENDING))
         else:
-            for field, ascending in ordering:
+            for column, ascending in ordering:
                 direction = ASCENDING if ascending else DESCENDING
-                self.ordering.append((field.column, direction))
+                self.ordering.append((column, direction))
 
     @wrap_database_errors
     def delete(self):