nim-protobuf-bug

test.nim

import streams
import protobuf

const protoSpec = """
syntax = "proto3";

message Example2 {
    string field1 = 1;
    int32 field2 = 2;
}

message Example {
    message ExampleNested {
        int32 field1 = 1;
        repeated Example2 example2 = 2;
        int32 field3 = 3;
    }
    ExampleNested exampleNested = 1;
    int32 field2 = 2;
}
"""
parseProto(protoSpec)

var msg = new Example
msg.exampleNested = initExample_ExampleNested(field1 = 5, field3 = 6)
let example2 = initExample2(field1 = "Test", field2 = 123)
msg.exampleNested.example2 = @[example2]
msg.field2 = 5

var strm = newFileStream("data_bug.bin", fmWrite)
strm.write(msg)

test.proto

syntax = "proto3";

message Example2 {
    string field1 = 1;
    int32 field2 = 2;
}

message Example {
    message ExampleNested {
        int32 field1 = 1;
        repeated Example2 example2 = 2;
        int32 field3 = 3;
    }
    ExampleNested exampleNested = 1;
    int32 field2 = 2;
}

test.py

import test_pb2

message = test_pb2.Example()
message.exampleNested.field1 = 5
message.exampleNested.field3 = 6
example2 = message.exampleNested.example2.add()
example2.field1 = "Test"
example2.field2 = 123
message.field2 = 5

with open("data.bin", "wb") as f:
    f.write(message.SerializeToString())