How to set JSON options to emit fields with default values in proto3

[ganl]

PHP

https://developers.google.cn/protocol-buffers/docs/proto3#json

JSON options
A proto3 JSON implementation may provide the following options:

Emit fields with default values: Fields with default values are omitted by default in proto3 JSON output. An implementation may provide an option to override this behavior and output fields with their default values.

how to set ？like：EmitDefaults or defaults_json

\Google\Protobuf\Internal\Message::existField 
……
            return $values !== $this->defaultValue($field);

Fields with default values are always omitted

[ganl]

@TeBoring

[TeBoring]

We haven't implemented that option yet. Would you like to contribute a PR? Thanks!

[csuntrane]

Any idea when this might be implemented. It seems proto2 doesn't have this issue.

[panol]

plus one

[deannagarcia]

While this is a reasonable request, the protobuf team will not be prioritizing this in the near future. If you send us a PR to add it, we would love to help get it merged!

[maciek-szn]

Well, this is great. Google's GTFS-RT specification requires field incrementality in the output file, with its default value (FULL_DATASET). Google's Protobuf compiler cuts off the default values 🤷‍♂️