Tagged "protobuf"

Dart 轉換 json 中的 protobuf 結構

最近開始將 flutter app 的後端由 restful api 逐步轉成 grpc，轉換的過程中為了同時兼容舊的 api，在原本的 json 結構中替換並嵌入了 protobuf 結構。結果在 json 序列化時 (flutter packages pub run build_runner build) 出現了類似以下錯誤：

[INFO] Generating build script completed, took 569ms
[INFO] Reading cached asset graph completed, took 77ms
[INFO] Checking for updates since last build completed, took 640ms
[SEVERE] json_serializable on lib/models/plustwo.dart:

Expecting a `fromJson` constructor with exactly one positional parameter. The only extra parameters allowed are functions of the form `T Function(Object?) fromJsonT` where `T` is a type parameter of the target type.
package:client/proto/calculator.pb.dart:40:28
   ╷
40 │   factory PlusTwoIntResult.fromJson($core.String i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromJson(i, r);
   │                            ^^^^^^^^
   ╵
[INFO] Running build completed, took 5.1s
[INFO] Caching finalized dependency graph completed, took 48ms
[SEVERE] Failed after 5.2s

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