Golang使用具有动态相关键的json

Question

I am new to GO and I am trying to consume json data from a variety of API's using GO and place them in struct's one of them Formats the data like so

{"MS": {
   "last":"25",
"highestBid":"20"},
"GE": {        
    "last": "24",        
    "highestBid": "22"}
}

While I can find information on Consuming with dynamic keys, all the examples I found throw away the Outer most key as arbitrary and irrelevant. I need to use it as a key value pair like bellow:

{"MarketName": "GE", "last":"24","higestBid":"22"}

I understand Using Interface map but I cant figure out how to map the dynamic key to the struct as a key : value pair like above. My Code example to map leaving out the need key can be found at play ground Relevant Code

  package main

import (
    "encoding/json"
    "fmt"

)

var jsonBytes = []byte(`
    {"MS": {
       "last":"25",
    "highestBid":"20"},
    "GE": {        
        "last": "24",        
        "highestBid": "22"}
    }`)

type Market struct {
    Last       string 
    HighestBid string 
}

func main() {
    // Unmarshal using a generic interface
    var f interface{}
    err := json.Unmarshal(jsonBytes, &f)
    if err != nil {
        fmt.Println("Error parsing JSON: ", err)
    }
    fmt.Println(f)



}

as it stands it outputs

map[MS:map[last:25 highestBid:20] GE:map[highestBid:22 last:24]]

As I stated I am new to GO and as much help and explanation that i can get would be very appreciated

Answer 1

You're halfway there already, you just need to unmarshal into your struct and then massage the data a little:

type Market struct {
    Name string
    Last       string 
    HighestBid string 
}

func main() {
    // Unmarshal using a generic interface
    var f map[string]Market
    err := json.Unmarshal(jsonBytes, &f)
    if err != nil {
        fmt.Println("Error parsing JSON: ", err)
        return
    }
    markets := make([]Market, 0, len(f))
    for k,v := range f {
        v.Name = k
        markets = append(markets,v)
    }
    fmt.Println(markets)
}

Working example here: https://play.golang.org/p/iagx8RWFfx_k