what's the right way to do polymorphism with protocol buffers?

Question

I\'m trying to long-term serialize a bunch of objects related by a strong class hierarchy in java, and I\'d like to use protocol buffers to do it due to their simplicity, pe

Answer 1

A solution a little better, for me, that the @Łukasz Marciniak's answer.

If Bar extends Foo, simply write:

message Bar {
   optional Foo foo = 1;
   optional double aDouble = 2;
}
message Foo {
   optional string aString = 1;
}

So if Foo evolves only Foo message is modified.