Golang如何在将结构编码(marshal)到yaml时避免在键 "on"上双引号

Question

我有一个简单的结构，例如:

type Foo struct {
    On string `yaml:"on"`
}

并希望以任何一种方式将此结构编码为 YAML 字符串

• 方式一:https://go.dev/play/p/Btwt3Gi09ZG
• 方式 2:https://go.dev/play/p/r9jwscnuOAR

总是得到相同的结果在键“on”上加双引号

"on": hello

我怎样才能避免这种情况？以下是我想要的结果

on: hello

go的版本是go1.17.2 darwin/amd64

Answer 1

这将是无效的 YAML1.1(或至少令人困惑)，因为 on 是被解释为 bool 值 true 的关键字(参见 YAML1.1 spec)。

根据 go-yaml documentation :

The yaml package supports most of YAML 1.2, but preserves some behavior from 1.1 for backwards compatibility.

Specifically, as of v3 of the yaml package:

• YAML 1.1 bools (yes/no, on/off) are supported as long as they are being decoded into a typed bool value. Otherwise they behave as a string. Booleans in YAML 1.2 are true/false only.

如果您将 yaml:"on" 更改为 yaml:"foo" 之类的任何其他内容，则不会引用 key 。

type T struct {
    On  string `yaml:"on"`
    Foo string `yaml:"foo"`
}

func main() {
    t := T{
        On:  "Hello",
        Foo: "world",
    }

    b, _ := yaml.Marshal(&t)
    fmt.Println(string(b))
}

// "on": hello
// foo: world