Daily Archives: 15.06.2021
Nullable fields in json generated from protobuf file
Native support With grpc v2 for go, protofile’s optional option is supported, so you don’t need to import proto extensions anymore and use things like google.protobuf.StringValue. my.proto
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message FeeView { optional string name = 1 [json_name = "name"]; } |
go mapper
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var name *string if fee.Name != nil { name = &fee.Name } fee := &desc.FeeView{ Name: name, } |
Legacy way with extensions Null for nil value my.proto
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import "google/protobuf/wrappers.proto"; message FeeView { google.protobuf.StringValue name = 1 [json_name = "name"]; } |
go mapper
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import "github.com/gogo/protobuf/types" var name *types.StringValue if fee.Name != nil { name = &types.StringValue{ Value: *fee.Name, } } fee := &desc.FeeView{ Name: name, } |
Which will lead to this json response
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{"translation_key":"a fee","name":null,"value":5,"style":"body","text_color":"grey","tag":null} |
Omit a field …