def get_field_deserializers(self,) -> dict[str, Callable[[ParseNode], None]]:
        """
        The deserialization information for the current model
        Returns: dict[str, Callable[[ParseNode], None]]
        """
        from .activity_history_item import ActivityHistoryItem
        from .entity import Entity
        from .status import Status
        from .visual_info import VisualInfo

        from .activity_history_item import ActivityHistoryItem
        from .entity import Entity
        from .status import Status
        from .visual_info import VisualInfo

        fields: dict[str, Callable[[Any], None]] = {
            "activationUrl": lambda n : setattr(self, 'activation_url', n.get_str_value()),
            "activitySourceHost": lambda n : setattr(self, 'activity_source_host', n.get_str_value()),
            "appActivityId": lambda n : setattr(self, 'app_activity_id', n.get_str_value()),
            "appDisplayName": lambda n : setattr(self, 'app_display_name', n.get_str_value()),
            "contentUrl": lambda n : setattr(self, 'content_url', n.get_str_value()),
            "createdDateTime": lambda n : setattr(self, 'created_date_time', n.get_datetime_value()),
            "expirationDateTime": lambda n : setattr(self, 'expiration_date_time', n.get_datetime_value()),
            "fallbackUrl": lambda n : setattr(self, 'fallback_url', n.get_str_value()),
            "historyItems": lambda n : setattr(self, 'history_items', n.get_collection_of_object_values(ActivityHistoryItem)),
            "lastModifiedDateTime": lambda n : setattr(self, 'last_modified_date_time', n.get_datetime_value()),
            "status": lambda n : setattr(self, 'status', n.get_enum_value(Status)),
            "userTimezone": lambda n : setattr(self, 'user_timezone', n.get_str_value()),
            "visualElements": lambda n : setattr(self, 'visual_elements', n.get_object_value(VisualInfo)),
        }
        super_fields = super().get_field_deserializers()
        fields.update(super_fields)
        return fields

        The deserialization information for the current model
        Returns: dict[str, Callable[[ParseNode], None]]
        
msgraph/generated/models/user_activity.py