Golang：如何将[] string转换为类型化的结构？

Question

With json objects it's simple:

type MyObj struct {
    Prop1   int      `json:"prop1"`
    Prop2   []string `json:"prop2"`
}

How would I cast simple []string slice against MyObj? I know I could iterate over slice and manually assign each property by respective index, but maybe there's more optimal way, considering that Prop1 references at 0 index of the slice, and Prop2 - 1.

EDIT1:

My actual JSON string looks like [100, 200]. So MyObj.Prop1 would get filled with 100, and MyObj.Prop2 with 200 respectively.

Thank you.

Answer 1

You'll need a custom json.Umnarshaller:

type MyObj struct {
    Prop1   int      `json:"prop1"`
    Prop2   int      `json:"prop2"`
}

func (a *MyObj) UnmarshalJSON(b []byte) error {
    s := []string{}

    if err := json.Unmarshal(b, &s); err != nil {
        return err
    }

    l := len(s)

    // Check slice bounds and errors!!
    a.Prop1, _ = strconv.Atoi(s[0])
    a.Prop2, _ = strconv.Atoi(s[l-1])

    return nil
}

Example: https://play.golang.org/p/fVobgtrqNw