FieldMask as query param is not converted to snake case

[goober]

FieldMask as query param is not converted to snake case

[johanbrandhorst]

Hi, thanks for your issue. I don't know that this is something we can natively support in the grpc-gateway. The intended use of updates in the grpc-gateway is to rely on the auto-population of the update mask based on the contents of the body. You can turn off this behavior and set the update mask explicitly, but is it really a better experience? I've never before heard of the update_mask being supplied in the query.

In any case, if you want to support this, you'll probably have to write your own query parameter parser and pass it into the runtime initialization with https://pkg.go.dev/github.com/grpc-ecosystem/grpc-gateway/v2/runtime#SetQueryParameterParser. The default query parameter parser attempts to match request fields both based on the JSON name and the protobuf field name, but makes no attempt to parse the update mask and perform a translation. Parsing the update mask query parameter field could break some users, I think?

I hope that makes sense, let me know if you have any other questions.