How to write a struct with nested recursive data in golang

Question

I have data like following

{
    "cars": {
        "toyota": [
            "sedan",
            "pickup"
        ],
        "honda": [
            "sedan",
            "couple",
            "pickup"
        ]
                ....
    }
}

The list might continue grow. I am trying to find out a proper struct to server the data and return to A http responsewriter.

the struct that I had.

type Autos struct {
    Cars struct {
        Toyota []string `json:"toyota"`
        Honda  []string `json:"honda"`
    } `json:"cars"`
}

But the above struct has predefined "Toyota" "Honda"

I am looking for a way to only use one or two struct to represent the data structure. Thanks in advance.

Possible duplicate of How Do I Unmarshal Dynamic Viper or JSON keys as part of struct field in go, golang struct for json with arbitrary keys, ... — user5728991
– user5728991, Commented Sep 3, 2019 at 0:13

Amit Kumar Gupta · Accepted Answer · 2019-09-03 00:12:26Z

0

You can do:

type Autos struct {
    Cars map[string][]string `json:"cars"`
}

Here's a full working example, that prints "coupe":

package main

import (
    "encoding/json"
)

type Autos struct {
    Cars map[string][]string `json:"cars"`
}

func main() {
    x := `{
    "cars": {
        "toyota": [
            "sedan",
            "pickup"
        ],
        "honda": [
            "sedan",
            "coupe",
            "pickup"
        ]
    }
}`

    var a Autos
    err := json.Unmarshal([]byte(x), &a)
    if err != nil {
        panic(err)
    }
    println(a.Cars["honda"][1])
}

Playground link

answered Sep 3, 2019 at 0:12

Amit Kumar Gupta

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1 Comment

wzcwts521 Over a year ago

Thanks @Amit Kumar Gupta

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