Extending Protobuf Messages

Question

I have many different schemas, however there are a set of fields which every schema contains. I was wondering if there was a way to have a different schema extend a parent schema and inherit its fields. For example this is what I want:

message Parent {     required string common1 = 0;     optional string common2 = 1; }  message Child1 { // can we extend the Parent?     // I want common1, common2 to be fields here     required int c1 = 2;     required string c2 = 3; }  message Child2 { // can we extend Parent?     // I want common1, common2 to be fields here     repeated int c3 = 2;     repeated string c4 = 3; } 

Such that Child1 and Child2 also contain the fields common1 and common2 (and potentially more) from Parent.

Is this possible and if so how?

Answer 1

This is not the exact answer to your question but we can do something like this to share common parameters.

message Child1 {      required int c1 = 2;     required string c2 = 3; }  message Child2 {      required int c1 = 2;     required string c2 = 3; }  message Request {     required string common1 = 0;     optional string common2 = 1;     oneof msg { Child1 c1 = 2; Child2 c2 = 3; }  } 

Other option is to use extend keyword

message Parent {     required string common1 = 0;     optional string common2 = 1; }  message Child1 {      extend Parent     {                optional Child1 c1 = 100;     }      required int c1 = 2;     required string c2 = 3; }