CODEWITHSUNDEEP
goyaml
Fandy Dharmawan
Fandy Dharmawan

Reputation: 328

YAML MapSlice to preserve the sequence when marshall or unmarshall

I'm confused how to use YAML MapSlice data Structure. It's from here https://sourcegraph.com/go/gopkg.in/yaml.v2/-/MapSlice . I manage to unmarshall to a type of MapSlice but how to map it to my own struct

var data = `
id:
  id-jakut:
    en:
      name: North Jakarta City
      label: North Jakarta
    id:
      name: Kota Jakarta Utara
      label: Jakarta Utara
  id-jaksel:
    en:
      name: South Jakarta City
      label: South Jakarta
    id:
      name: Kota Jakarta Selatan
      label: Jakarta Selatan
tw:
  tw-tp:
    en:
      name: Taipei City
      label: Taipei
    zh-TW:
      name: 台北
      label: 台北市
  tw-ntp:
    en:
      name: New Taipei City
      label: New Taipei City
    zh-TW:
      name: 新北市
      label: 新北市
`

type cityLocale struct {
    Name  string `yaml:"name,flow"`
    Label string `yaml:"label,flow"`
}

type cityLocales map[string]cityLocale
type cities map[string]cityLocales
type countryCities map[string]cities

func main() {
    m := yaml.MapSlice{}
    err := yaml.Unmarshal([]byte(data), &m)
    if err != nil {
        log.Fatalf("error: %v", err)
    }
    fmt.Printf("MAPSLICE==>%+v\n\n", m)     

    t := countryCities{}
    err = yaml.Unmarshal([]byte(data), &t)
    if err != nil {
        log.Fatalf("error: %v", err)
    }
    fmt.Printf("NORMAL==>%+v\n", t["tw"])

}

Upvotes: 0

Views: 2982

Answers (2)

noranraskin
noranraskin

Reputation: 1427

You can convert the MapSlice to your own type. This involves type conversion. Especially for nested types like you have in your example.
I've given a very basic example in another answer you can find here.

Upvotes: 0

apxp
apxp

Reputation: 5894

You need to change your cities type, because you missed one map. If your cities are a map of map of strings your code works:

type cities map[string]map[string]cityLocales

Upvotes: 1

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