def serialize(self,writer: SerializationWriter) -> None:
        """
        Serializes information the current object
        param writer: Serialization writer to use to serialize this model
        Returns: None
        """
        if writer is None:
            raise TypeError("writer cannot be null.")
        super().serialize(writer)
        writer.write_object_value("allTime", self.all_time)
        writer.write_collection_of_object_values("itemActivityStats", self.item_activity_stats)
        writer.write_object_value("lastSevenDays", self.last_seven_days)

        Serializes information the current object
        param writer: Serialization writer to use to serialize this model
        Returns: None
        
msgraph/generated/models/item_analytics.py