add database converters for ArrayField

Author: timgraham

django_mongodb/features.py

@@ -92,8 +92,6 @@ class DatabaseFeatures(BaseDatabaseFeatures):
         "model_fields_.test_arrayfield.TestQuerying.test_exact_with_expression",
         # int() argument must be a string, a bytes-like object or a real number, not 'list'
         "model_fields_.test_arrayfield.TestQuerying.test_index_annotation",
-        # the JSON object must be str, bytes or bytearray, not dict
-        "model_fields_.test_arrayfield.TestSaveLoad.test_other_array_types",
         # Wrong results
         "model_fields_.test_arrayfield.TestQuerying.test_exact",
         "model_fields_.test_arrayfield.TestQuerying.test_gt",
@@ -111,8 +109,6 @@ class DatabaseFeatures(BaseDatabaseFeatures):
         "model_fields_.test_arrayfield.TestQuerying.test_slice",
         "model_fields_.test_arrayfield.TestQuerying.test_slice_annotation",
         "model_fields_.test_arrayfield.TestQuerying.test_usage_in_subquery",
-        # database converters not applied
-        "model_fields_.test_arrayfield.TestSaveLoad.test_dates",
     }
     # $bitAnd, #bitOr, and $bitXor are new in MongoDB 6.3.
     _django_test_expected_failures_bitwise = {

django_mongodb/operations.py

@@ -9,7 +9,7 @@
 from django.db import DataError
 from django.db.backends.base.operations import BaseDatabaseOperations
 from django.db.models import TextField
-from django.db.models.expressions import Combinable
+from django.db.models.expressions import Combinable, Expression
 from django.db.models.functions import Cast
 from django.utils import timezone
 from django.utils.regex_helper import _lazy_re_compile
@@ -77,10 +77,26 @@ def adapt_timefield_value(self, value):
             raise ValueError("MongoDB backend does not support timezone-aware times.")
         return datetime.datetime.combine(datetime.datetime.min.date(), value)
 
+    def _get_arrayfield_converter(self, converter, *args, **kwargs):
+        # Return a database converter that can be applied to a list of values.
+        def convert_value(value, expression, connection):
+            return [converter(x, expression, connection) for x in value]
+
+        return convert_value
+
     def get_db_converters(self, expression):
         converters = super().get_db_converters(expression)
         internal_type = expression.output_field.get_internal_type()
-        if internal_type == "DateField":
+        if internal_type == "ArrayField":
+            converters.extend(
+                [
+                    self._get_arrayfield_converter(converter)
+                    for converter in self.get_db_converters(
+                        Expression(output_field=expression.output_field.base_field)
+                    )
+                ]
+            )
+        elif internal_type == "DateField":
             converters.append(self.convert_datefield_value)
         elif internal_type == "DateTimeField":
             if settings.USE_TZ: