dou29106 2018-11-07 09:01
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I have the following JSON

{"student_number":1234567, "name":"John Doe", "subjects":"Chemistry-Maths-History-Geography"}

I would like to unmarshal it in a struct, where one item (the subjects) are split on '-' into a []string.

type Student struct {
  StudentNumber int       `json:"student_number"`
  Name          string    `json:"name"`
  Subjects []string 

I have attempted several different ways of achieving this with custom Unmarshalling using strings.Split(), but have not succeeded so far.

Is there any way to achieve this in the unmarshalling process? Or will I need to simply unmarshal as is and make the conversion afterward?

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  • dtslobe4694 2018-11-07 09:10

    Easiest would be to define your own string slice type and implement json.Unmarshaler on that:

    type strslice []string
    func (ss *strslice) UnmarshalJSON(data []byte) error {
        var s string
        if err := json.Unmarshal(data, &s); err != nil {
            return err
        *ss = strings.Split(s, "-")
        return nil

    And use this in your struct:

    type Student struct {
        StudentNumber int      `json:"student_number"`
        Name          string   `json:"name"`
        Subjects      strslice `json:"subjects"`

    And then it'll work:

    func main() {
        var s Student
        err := json.Unmarshal([]byte(src), &s)
        fmt.Println(s, err)
    const src = `{"student_number":1234567, "name":"John Doe", "subjects":"Chemistry-Maths-History-Geography"}`

    Output (try it on the Go Playground):

    {1234567 John Doe [Chemistry Maths History Geography]} <nil>
    本回答被题主选为最佳回答 , 对您是否有帮助呢?



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