Suppose I have the following protobuf file definitions:
syntax = "proto2";
message request {
optional string a = 1;
optional bytes b = 2;
}
message dummy {
optional string u = 1;
optional request v = 2;
}
The following are my doubts/requirements:
Check if any of the fields is set or not in "request" object? Check if the field "u" is set in "dummy" object? Check if the field "v" is set (meaning if any of the internal fields are set to some value) in "dummy" object? How to deal with situations involving fields having default values? Write the code in such a manner so that it is compatible with version 3 of Google protobufs too. I tried creating 2 objects "p" and "q" of type dummy object. Initially, both of them returned "False" on the condition "HasField("v")". Then I tried to copy field "v" from "q" to "p" using the code: "pvCopyFrom(qv)". But now, object "p" returned "True" on the condition "HasField("v")". Why does this happen? My codebase is currently using python version 2.7.5 and protobuf version 2.6. It can happen I may upgrade the python and protobuf versions in future. Hence, would like to know if I could write code in such a manner which is compatible across versions.
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