Protobuf Practice

Edit the schema, wait for the descriptor checks, and continue when everything passes.

Progress

7. Oneof

Context

A notification target can be identified by either a `user_id` or an `email`, but not both.

Task

Group user_id and email inside a oneof block named identifier.

schema.proto

Valid Schema

syntax = "proto3";

package practice;

message NotificationTarget {
  string user_id = 1;
  string email = 2;
}

EVALUATION_CHECKS

A oneof block named 'identifier' is declared.

Both 'user_id' and 'email' fields are members of the 'identifier' oneof.

Please satisfy all checks above

Write practical schemas with messages, fields, and types.

Evolve messages without breaking deployed systems.

Decode wire-format bytes one field at a time.