I am exploring the use of protocol buffers and would like to use the new Timestamp data type which is in protobuf3. Here is my .proto file:
syntax = "proto3";
package shoppingbasket;
import "google/protobuf/timestamp.proto";
message TransactionItem {
optional string product = 1;
optional int32 quantity = 2;
optional double price = 3;
optional double discount = 4;
}
message Basket {
optional string basket = 1;
optional google.protobuf.Timestamp tstamp = 2;
optional string customer = 3;
optional string store = 4;
optional string channel = 5;
repeated TransactionItem transactionItems = 6;
}
message Baskets {
repeated Basket baskets = 1;
}
After generating python classes from this .proto file I'm attempting to create some objects using the generated classes. Here's the code:
import shoppingbasket_pb2
from google.protobuf.timestamp_pb2 import Timestamp
baskets = shoppingbasket_pb2.Baskets()
basket1 = baskets.baskets.add()
basket1.basket = "001"
basket1.tstamp = Timestamp().GetCurrentTime()
which fails with error:
AttributeError: Assignment not allowed to composite field "tstamp" in protocol message object.
Can anyone explain to me why this isn't working as I am nonplussed.