fix(event_handler): custom serializer recursive values

Author: heitorlessa

aws_lambda_powertools/event_handler/openapi/encoders.py

@@ -115,8 +115,9 @@ def jsonable_encoder(  # noqa: PLR0911
                 include=include,
                 exclude=exclude,
                 by_alias=by_alias,
-                exclude_none=exclude_none,
                 exclude_unset=exclude_unset,
+                exclude_none=exclude_none,
+                custom_serializer=custom_serializer,
             )
 
         # Sequences
@@ -201,9 +202,14 @@ def _dump_dict(
     by_alias: bool = True,
     exclude_unset: bool = False,
     exclude_none: bool = False,
+    custom_serializer: Optional[Callable[[Any], str]] = None,
 ) -> Dict[str, Any]:
     """
     Dump a dict to a dict, using the same parameters as jsonable_encoder
+
+    Parameters
+    ----------
+    custom_serializer
     """
     encoded_dict = {}
     allowed_keys = set(obj.keys())
@@ -222,12 +228,14 @@ def _dump_dict(
                 by_alias=by_alias,
                 exclude_unset=exclude_unset,
                 exclude_none=exclude_none,
+                custom_serializer=custom_serializer,
             )
             encoded_value = jsonable_encoder(
                 value,
                 by_alias=by_alias,
                 exclude_unset=exclude_unset,
                 exclude_none=exclude_none,
+                custom_serializer=custom_serializer,
             )
             encoded_dict[encoded_key] = encoded_value
     return encoded_dict

tests/functional/event_handler/_pydantic/test_openapi_encoders.py

@@ -193,3 +193,21 @@ class MyClass:
 
     with pytest.raises(SerializationError, match="Unable to serialize the object*"):
         jsonable_encoder(MyClass())
+
+
+def test_openapi_encode_custom_serializer_nested_dict():
+    # GIVEN a nested dictionary with a custom class
+    class CustomClass(object):
+        __slots__ = []
+
+    nested_dict = {"a": {"b": CustomClass()}}
+
+    # AND a custom serializer
+    def serializer(value):
+        return "serialized"
+
+    # WHEN we call jsonable_encoder with the nested dictionary and unserializable value
+    result = jsonable_encoder(nested_dict, custom_serializer=serializer)
+
+    # THEN we should get the custom serializer output
+    assert result == {"a": {"b": "serialized"}}