Exception: string index out of range when fetching site lists with expand:fields

Describe the bug

I am trying to fetch the list of lists for a given site, with an expand on the fields.
This crashes during deserialisation with a "string index out of range".
The full stack trace is the following

File /usr/local/lib/python3.10/site-packages/msgraph/generated/sites/item/lists/item/items/items_request_builder.py:81, in ItemsRequestBuilder.get(self, request_configuration)
     78     raise Exception("Http core is null") 
     79 from ......models.list_item_collection_response import ListItemCollectionResponse
---> 81 return await self.request_adapter.send_async(request_info, ListItemCollectionResponse, error_mapping)

File /usr/local/lib/python3.10/site-packages/kiota_http/httpx_request_adapter.py:196, in HttpxRequestAdapter.send_async(self, request_info, parsable_factory, error_map)
    194     return None
    195 _deserialized_span = self._start_local_tracing_span("get_object_value", parent_span)
--> 196 value = root_node.get_object_value(parsable_factory)
    197 parent_span.set_attribute(DESERIALIZED_MODEL_NAME_KEY, value.__class__.__name__)
    198 _deserialized_span.end()

File /usr/local/lib/python3.10/site-packages/kiota_serialization_json/json_parse_node.py:222, in JsonParseNode.get_object_value(self, factory)
    220 if on_before := self.on_before_assign_field_values:
    221     on_before(result)
--> 222 self._assign_field_values(result)
    223 if on_after := self.on_after_assign_field_values:
    224     on_after(result)

File /usr/local/lib/python3.10/site-packages/kiota_serialization_json/json_parse_node.py:291, in JsonParseNode._assign_field_values(self, item)
    289         continue
    290     field_deserializer = field_deserializers[field_name]
--> 291     field_deserializer(JsonParseNode(field_value))
    292 elif item_additional_data is not None:
    293     item_additional_data[field_name] = self.try_get_anything(field_value)

File /usr/local/lib/python3.10/site-packages/msgraph/generated/models/list_item_collection_response.py:40, in ListItemCollectionResponse.get_field_deserializers.<locals>.<lambda>(n)
     36 from .base_collection_pagination_count_response import BaseCollectionPaginationCountResponse
     37 from .list_item import ListItem
     39 fields: Dict[str, Callable[[Any], None]] = {
---> 40     "value": lambda n : setattr(self, 'value', n.get_collection_of_object_values(ListItem)),
     41 }
     42 super_fields = super().get_field_deserializers()
     43 fields.update(super_fields)

File /usr/local/lib/python3.10/site-packages/kiota_serialization_json/json_parse_node.py:170, in JsonParseNode.get_collection_of_object_values(self, factory)
    165 """Gets the collection of type U values from the json node
    166 Returns:
    167     List[U]: The collection of model object values of the node
    168 """
    169 if isinstance(self._json_node, list):
--> 170     return list(
    171         map(
    172             lambda x: self._create_new_node(x).get_object_value(factory),  # type: ignore
    173             self._json_node,
    174         )
    175     )
    176 return []

File /usr/local/lib/python3.10/site-packages/kiota_serialization_json/json_parse_node.py:172, in JsonParseNode.get_collection_of_object_values.<locals>.<lambda>(x)
    165 """Gets the collection of type U values from the json node
    166 Returns:
    167     List[U]: The collection of model object values of the node
    168 """
    169 if isinstance(self._json_node, list):
    170     return list(
    171         map(
--> 172             lambda x: self._create_new_node(x).get_object_value(factory),  # type: ignore
    173             self._json_node,
    174         )
    175     )
    176 return []

File /usr/local/lib/python3.10/site-packages/kiota_serialization_json/json_parse_node.py:222, in JsonParseNode.get_object_value(self, factory)
    220 if on_before := self.on_before_assign_field_values:
    221     on_before(result)
--> 222 self._assign_field_values(result)
    223 if on_after := self.on_after_assign_field_values:
    224     on_after(result)

File /usr/local/lib/python3.10/site-packages/kiota_serialization_json/json_parse_node.py:291, in JsonParseNode._assign_field_values(self, item)
    289         continue
    290     field_deserializer = field_deserializers[field_name]
--> 291     field_deserializer(JsonParseNode(field_value))
    292 elif item_additional_data is not None:
    293     item_additional_data[field_name] = self.try_get_anything(field_value)

File /usr/local/lib/python3.10/site-packages/msgraph/generated/models/list_item.py:76, in ListItem.get_field_deserializers.<locals>.<lambda>(n)
     68 from .list_item_version import ListItemVersion
     69 from .sharepoint_ids import SharepointIds
     71 fields: Dict[str, Callable[[Any], None]] = {
     72     "analytics": lambda n : setattr(self, 'analytics', n.get_object_value(ItemAnalytics)),
     73     "contentType": lambda n : setattr(self, 'content_type', n.get_object_value(ContentTypeInfo)),
     74     "documentSetVersions": lambda n : setattr(self, 'document_set_versions', n.get_collection_of_object_values(DocumentSetVersion)),
     75     "driveItem": lambda n : setattr(self, 'drive_item', n.get_object_value(DriveItem)),
---> 76     "fields": lambda n : setattr(self, 'fields', n.get_object_value(FieldValueSet)),
     77     "sharepointIds": lambda n : setattr(self, 'sharepoint_ids', n.get_object_value(SharepointIds)),
     78     "versions": lambda n : setattr(self, 'versions', n.get_collection_of_object_values(ListItemVersion)),
     79 }
     80 super_fields = super().get_field_deserializers()
     81 fields.update(super_fields)

File /usr/local/lib/python3.10/site-packages/kiota_serialization_json/json_parse_node.py:222, in JsonParseNode.get_object_value(self, factory)
    220 if on_before := self.on_before_assign_field_values:
    221     on_before(result)
--> 222 self._assign_field_values(result)
    223 if on_after := self.on_after_assign_field_values:
    224     on_after(result)

File /usr/local/lib/python3.10/site-packages/kiota_serialization_json/json_parse_node.py:293, in JsonParseNode._assign_field_values(self, item)
    291     field_deserializer(JsonParseNode(field_value))
    292 elif item_additional_data is not None:
--> 293     item_additional_data[field_name] = self.try_get_anything(field_value)
    294 else:
    295     warnings.warn(
    296         f"Found additional property {field_name} to \
    297         deserialize but the model doesn't support additional data"
    298     )

File /usr/local/lib/python3.10/site-packages/kiota_serialization_json/json_parse_node.py:316, in JsonParseNode.try_get_anything(self, value)
    313 if self.__is_four_digit_number(value):
    314     return value
--> 316 datetime_obj = pendulum.parse(value)
    317 if isinstance(datetime_obj, pendulum.Duration):
    318     return datetime_obj.as_timedelta()

File /usr/local/lib/python3.10/site-packages/pendulum/parser.py:30, in parse(text, **options)
     26 def parse(text: str, **options: t.Any) -> Date | Time | DateTime | Duration:
     27     # Use the mock now value if it exists
     28     options["now"] = options.get("now")
---> 30     return _parse(text, **options)

File /usr/local/lib/python3.10/site-packages/pendulum/parser.py:43, in _parse(text, **options)
     40 if text == "now":
     41     return pendulum.now()
---> 43 parsed = base_parse(text, **options)
     45 if isinstance(parsed, datetime.datetime):
     46     return pendulum.datetime(
     47         parsed.year,
     48         parsed.month,
   (...)
     54         tz=parsed.tzinfo or options.get("tz", UTC),
     55     )

File /usr/local/lib/python3.10/site-packages/pendulum/parsing/__init__.py:78, in parse(text, **options)
     75 _options: dict[str, Any] = copy.copy(DEFAULT_OPTIONS)
     76 _options.update(options)
---> 78 return _normalize(_parse(text, **_options), **_options)

File /usr/local/lib/python3.10/site-packages/pendulum/parsing/__init__.py:116, in _parse(text, **options)
    113     return parse_iso8601(text)
    115 with contextlib.suppress(ValueError):
--> 116     return _parse_iso8601_interval(text)
    118 with contextlib.suppress(ParserError):
    119     return _parse_common(text, **options)

File /usr/local/lib/python3.10/site-packages/pendulum/parsing/__init__.py:217, in _parse_iso8601_interval(text)
    214 first, last = text.split("/")
    215 start = end = duration = None
--> 217 if first[0] == "P":
    218     # duration/end
    219     duration = parse_iso8601(first)
    220     end = parse_iso8601(last)

IndexError: string index out of range

The field that is being deserialised is 'WorkPhone' with a value of '/'. That is clearly not a date even though it is trying to decode it as a date.

Expected behavior

I expect to retrieve the decoded object

How to reproduce

from azure.identity import ClientSecretCredential
from msgraph import GraphServiceClient
import asyncio
from msgraph.generated.users.item.messages.messages_request_builder import  MessagesRequestBuilder

credentials = ClientSecretCredential(
            tenant_id=SHAREPOINT_TENANT_ID,
            client_id=SHAREPOINT_CLIENT_ID,
            client_secret=SHAREPOINT_SECRET_VALUE
        )
client = GraphServiceClient(credentials, scopes=["https://graph.microsoft.com/.default"])
loop = asyncio.get_event_loop()

site_id = <the_site_id>

query_params = MessagesRequestBuilder.MessagesRequestBuilderGetQueryParameters(expand=['fields'])
configuration = MessagesRequestBuilder.MessagesRequestBuilderGetRequestConfiguration(query_parameters=query_params)
fn = client.sites.by_site_id(site_id)lists.by_list_id("User Information List").items.get(request_configuration=configuration)
a = asyncio.run_coroutine_threadsafe(fn, loop)
a.result()

This obviously triggers the issue only when the data coming from the request contains the mentioned field with the specific value.

SDK Version

1.11.0

Latest version known to work for scenario above?

None

Known Workarounds

No response

Debug output

No response

Configuration

No response

Other information

No response

kiota_serialization_json/json_parse_node.py、特に try_get_anything から始め、expand=['fields'] と WorkPhone の値 '/' を指定してサイト一覧リクエストを再現してください。その値が pendulum.parse に到達する理由を追跡してください。この入力に対して、リクエストが IndexError ではなくデコードされたオブジェクトを返せば完了です。