在Go中序列化混合类型JSON数组

Question

I want to return a structure that looks like this:

{
    results: [
        ["ooid1", 2.0, "Söme text"],
        ["ooid2", 1.3, "Åther text"],
    ]
}

That's an array of arrags that is string, floating point number, unicode character.

If it was Python I'd be able to:

import json
json.dumps({'results': [["ooid1", 2.0, u"Söme text"], ...])

But in Go you can't have an array (or slice) of mixed types.

I thought of using a struct like this:

type Row struct {
    Ooid string
    Score float64
    Text rune
}

But I don't want each to become a dictionary, I want it to become an array of 3 elements each.

Answer 1

Use []interface{}

type Results struct {
     Rows []interface{} `json:"results"`
}

You will then have to use type assertion if you want to access the values stored in []interface{}

for _, row := range results.Rows {
    switch r := row.(type) {
    case string:
        fmt.Println("string", r)
    case float64:
        fmt.Println("float64", r)
    case int64:
        fmt.Println("int64", r)
    default:
        fmt.Println("not found")
    } 
}