How to map the nested field in a collection to go struct that is not nested in format?-CodePudding

Format of bson:

{
  name: "root", 
  sports:" Cricket", 
  Personal: {
     age:32
  }
}

Go struct format:

type Person struct {
    Name string `bson:"name"`
    Age  int `bson:"age"`
}

How to bind the value of age into this struct format in golang?

CodePudding user response：

You need an intermediate type that will help you transform your database DTO (Data Transform Object) into model object. It is recommended to separate those two.

package main

import (
    "encoding/json"
    "fmt"
)

type PersonInfoDto struct {
    Age int `json:"age"`
}

type PersonDto struct {
    Name     string        `json:"name"`
    Sports   string        `json:"sports"`
    Personal PersonInfoDto `json:"Personal"`
}

type Person struct {
    Name string
    Age  int
}

func main() {
    jsonInput := "{ \"name\": \"root\", \"sports\": \"Cricket\", \"Personal\": { \"age\": 32 }}"
    var dto PersonDto
    err := json.Unmarshal([]byte(jsonInput), &dto)
    if err != nil {
        fmt.Println(err)
    }

    // your model object
    p := Person{dto.Name, dto.Personal.Age}
    fmt.Println(p)
}