在解组到映射[string]接口{}失败后,将断言键入ma[string][]string

无法断言该类型 map[string][]string 解封后 map[string]interface{} . Here 下面是一个小片段来重现这个问题:

package main

import (
    "encoding/json"
    "fmt"
)

type Test struct {
    M map[string][]string `json:"m"`
}

func main() {
    b := []byte(`{"m":{}}`) //m will always exist but it might be empty or have some values. No difference if me is not empty, e.g. `{"m":{"s": ["abc"]}}`

    var test Test
    json.Unmarshal(b, &test) // This is fine, but for some reason I have to unmarshal to map[string]interface{}
    fmt.Println(test)

    var raw map[string]interface{}
    json.Unmarshal(b, &raw)
    test2 := Test{}
    test2.M = raw["m"].(map[string][]string) // error here
    fmt.Println(test2)
}

我得到了这个错误:

interface {} is map[string]interface {}, not map[string][]string