如何直接访问YAML unmarshall中的嵌套内部键值对？

huangapple
go评论103阅读模式
英文:

How to access nested inner key-values directly in YAML unmarshall

问题

我的配置文件包含多个内部结构的结构化配置，这里是一个公司的例子。

在顶层，我想直接访问我在config.yaml中已知存在的公司的特定属性。

是否可以只使用结构标签来进行解组操作？

  1. package main
  3. import (
  4. 	"fmt"
  6. 	"gopkg.in/yaml.v2"
  7. )
  9. type Org struct {
  10. 	Ceo string `yaml:"ceo"`
  11. }
  13. type Config struct {
  14. 	Companies map[string]Org `yaml:"companies"`
  15. 	GoogleCEO string         `yaml:"companies.google.ceo"`
  16. }
  18. func main() {
  19. 	var config Config
  21. 	yamlFile := []byte(`companies:
  22.   google:
  23.     ceo: "Sundar Pichai"
  24.   amazon:
  25.     ceo: "Jeff Bezos"`)
  26. 	err := yaml.Unmarshal(yamlFile, &config)
  27. 	check(err)
  29. 	fmt.Printf("config:\n%#v", config)
  30. }
  32. func check(e error) {
  33. 	if e != nil {
  34. 		panic(e)
  35. 	}
  36. }

https://go.dev/play/p/G_1NV46yWrv

英文:

My configs contain multiple structured configs of an inner struct, in this case- a company.

At the top-level, I want access directly to a particular attribute in a company I know exists in my config.yaml.

Is it possible to have this unmarshalling using just struct tags?

  1. package main
  3. import (
  4. 	"fmt"
  6. 	"gopkg.in/yaml.v2"
  7. )
  9. type Org struct {
  10. 	Ceo string `yaml:"ceo"`
  11. }
  13. type Config struct {
  14. 	Companies map[string]Org `yaml:"companies"`
  15. 	GoogleCEO string         `yaml:"companies.google.ceo"`
  16. }
  18. func main() {
  19. 	var config Config
  21. 	yamlFile := []byte(`companies:
  22.   google:
  23.     ceo: "Sundar Pichai"
  24.   amazon:
  25.     ceo: "Jeff Bezos"`)
  26. 	err := yaml.Unmarshal(yamlFile, &config)
  27. 	check(err)
  29. 	fmt.Printf("config:\n%#v", config)
  30. }
  32. func check(e error) {
  33. 	if e != nil {
  34. 		panic(e)
  35. 	}
  36. }

https://go.dev/play/p/G_1NV46yWrv

答案1

得分: 1

很抱歉，你不能使用标签来实现这个。最接近的选项是嵌套结构体：

  1. type Config struct {
  2. 	Companies struct {
  3. 		Google struct {
  4. 			CEO string `yaml:"ceo"`
  5. 		} `yaml:"google"`
  6. 	} `yaml:"companies"`
  7. }

https://go.dev/play/p/28pcPUiZvO-

英文:

Unfortunately, you cannot do it with tags.

Closest option is nested structs:

  1. type Config struct {
  2. 	Companies struct {
  3. 		Google struct {
  4. 			CEO string `yaml:"ceo"`
  5. 		} `yaml:"google"`
  6. 	} `yaml:"companies"`
  7. }

https://go.dev/play/p/28pcPUiZvO-

huangapple
  • 本文由 发表于 2022年6月2日 05:32:52
  • 转载请务必保留本文链接：https://go.coder-hub.com/72468290.html
  • go
  • yaml
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