[5.1.x] Backports for 5.1.0b4 release

.github/workflows/zizmor.yml

@@ -17,16 +17,5 @@ jobs:
         uses: actions/checkout@v4
         with:
           persist-credentials: false
-      - name: Setup Rust
-        uses: actions-rust-lang/setup-rust-toolchain@v1
-      - name: Get zizmor
-        run: cargo install zizmor
       - name: Run zizmor
-        run: zizmor --format sarif . > results.sarif
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      - name: Upload SARIF file
-        uses: github/codeql-action/upload-sarif@v3
-        with:
-          sarif_file: results.sarif
-          category: zizmor
+        uses: zizmorcore/zizmor-action@1c7106082dbc1753372e3924b7da1b9417011a21

django_mongodb_backend/__init__.py

@@ -1,4 +1,4 @@
-__version__ = "5.1.0b4.dev0"
+__version__ = "5.1.0b4"
 
 # Check Django compatibility before other imports which may fail if the
 # wrong version of Django is installed.

django_mongodb_backend/compiler.py

@@ -260,7 +260,6 @@ def execute_sql(
             else:
                 return self._make_result(obj, self.columns)
         # result_type is MULTI
-        cursor.batch_size(chunk_size)
         result = self.cursor_iter(cursor, chunk_size, self.columns)
         if not chunked_fetch:
             # If using non-chunked reads, read data into memory.

django_mongodb_backend/functions.py

@@ -199,6 +199,9 @@ def trunc(self, compiler, connection):
     return {"$dateTrunc": lhs_mql}
 
 
+_trunc_convert_value = TruncBase.convert_value
+
+
 def trunc_convert_value(self, value, expression, connection):
     if connection.vendor == "mongodb":
         # A custom TruncBase.convert_value() for MongoDB.
@@ -223,7 +226,7 @@ def trunc_convert_value(self, value, expression, connection):
                 # Truncate for Trunc(..., output_field=TimeField)
                 value = value.time()
         return value
-    return self.convert_value(value, expression, connection)
+    return _trunc_convert_value(self, value, expression, connection)
 
 
 def trunc_date(self, compiler, connection):

django_mongodb_backend/operations.py

@@ -80,6 +80,8 @@ def adapt_timefield_value(self, 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):
+            if value is None:
+                return None
             return [converter(x, expression, connection) for x in value]
 
         return convert_value

docs/source/releases/5.1.x.rst

@@ -2,6 +2,17 @@
 Django MongoDB Backend 5.1.x
 ============================
 
+5.1.0 beta 4
+============
+
+*July 28, 2025*
+
+- Fixed crash when loading models with a null value for ``ArrayField``\s where
+  the ``base_field`` uses a database converter.
+- Fixed ``RecursionError`` when using ``Trunc`` database functions on non-MongoDB
+  databases.
+- Improved ``QuerySet`` performance by removing low limit on server-side chunking.
+
 5.1.0 beta 3
 ============
 

tests/model_fields_/models.py

@@ -80,7 +80,12 @@ class NestedIntegerArrayModel(models.Model):
 class OtherTypesArrayModel(models.Model):
     ips = ArrayField(models.GenericIPAddressField(), default=list)
     uuids = ArrayField(models.UUIDField(), default=list)
-    decimals = ArrayField(models.DecimalField(max_digits=5, decimal_places=2), default=list)
+    decimals = ArrayField(
+        models.DecimalField(max_digits=5, decimal_places=2),
+        default=list,
+        null=True,
+        blank=True,
+    )
     tags = ArrayField(TagField(), blank=True, null=True)
     json = ArrayField(models.JSONField(default=dict), default=list)
 

tests/model_fields_/test_arrayfield.py

@@ -195,10 +195,11 @@ def test_null_from_db_value_handling(self):
         instance = OtherTypesArrayModel.objects.create(
             ips=["192.168.0.1", "::1"],
             uuids=[uuid.uuid4()],
-            decimals=[decimal.Decimal(1.25), 1.75],
+            decimals=None,
             tags=None,
         )
         instance.refresh_from_db()
+        self.assertIsNone(instance.decimals)
         self.assertIsNone(instance.tags)
         self.assertEqual(instance.json, [])