如何解组json并填充到golang中的结构

Question

How to unmarshal the json and fill into structures. Like i'm having salesorder and salesorderdetails structures. In json i will have 1 record for salesorder and multiple items for salesorderdetails structure.

Here is the go code i have tried with single item and for multiple items, but working only for single record for salesorderdetails structure.

Gocode:

package main

import (
    "encoding/json"
    "fmt"
)

type Order struct {
    SalesId             string `json:"sales_id"`
    Customer string `json:"customer_name"`
    TotalPrice   string `json:"totalprice"`
}
type OrderDetails struct {
    DetailId             string `json:"detail_id"`
    SalesId             string `json:"sales_id"`
    ItemName string `json:"item_name"`
    Qty   string `json:"qty"`
    Price   string `json:"price"`
}
type Temp struct {

    Salesorder Order  `json:"Salesorder"`
    Salesorderdetails OrderDetails  `json:"OrderDetails"`
}

func main() {
    jsonByteArray := []byte(`[{"Salesorder":{"sales_id":"SOO1","customer_name":"CUST1","totalprice":"200"}, "OrderDetails":{"detailid":"1","sales_id":"SOO1","item_name":"ITEM1","qty":"2","price":"100"}}]`)

   //if i use above json it is working and if i use below json its not working
//jsonByteArray := []byte(`[{"Salesorder":{"sales_id":"SOO1","customer_name":"CUST1","totalprice":"200"}, "OrderDetails":{"detailid":"1","sales_id":"SOO1","item_name":"ITEM1","qty":"2","price":"100"},{"detailid":"2","sales_id":"SOO2","item_name":"ITEM2","qty":"3","price":"200"}}]`)

    var temp []Temp
    err := json.Unmarshal(jsonByteArray, &temp)
    if err != nil {
        panic(err)
    }
    fmt.Printf("%+v
", temp)
    fmt.Printf("%+v
 ", temp[0].Salesorder.SalesId)
}

Error while using multiple items:

panic: invalid character '{' looking for beginning of object key string

Output while using single item with success:

[{Salesorder:{SalesId:SOO1 Customer:CUST1 TotalPrice:200} Salesorderdetails:{SalesId:SOO1 ItemName:ITEM1 Qty:2 Price:100}}]
SOO1

Fiddle: updated with key in salesorderdetails

https://play.golang.org/p/klIAoNi18r

Answer 1

Try this:

package main

import (
    "encoding/json"
    "fmt"
)

type Order struct {
    SalesId     string `json:"sales_id"`
    Customer    string `json:"customer_name"`
    TotalPrice  string `json:"totalprice"`
}

type OrderDetails struct {
    SalesId   string `json:"sales_id"`
    ItemName  string `json:"item_name"`
    Qty       string `json:"qty"`
    Price     string `json:"price"`
}

type Temp struct {
    Salesorder Order                  `json:"Salesorder"`
    Salesorderdetails []OrderDetails  `json:"OrderDetails"`
}

func main() {
    jsonByteArray := []byte(`[{"Salesorder":{"sales_id":"SOO1","customer_name":"CUST1","totalprice":"200"}, "OrderDetails":[{"sales_id":"SOO1","item_name":"ITEM1","qty":"2","price":"100"},{"sales_id":"SOO2","item_name":"ITEM2","qty":"3","price":"200"}]}]`)

    var temp []Temp

    err := json.Unmarshal(jsonByteArray, &temp)
    if err != nil {
        panic(err)
    }

    //fmt.Printf("%+v
", temp)

    // Printing all Orders with some details
    for _, order := range temp {
        fmt.Println("Customer:", order.Salesorder.Customer)

        for _, details := range order.Salesorderdetails {
            fmt.Printf("    ItemName: %s, Price: %s
", details.ItemName, details.Price)
        }
    }
}

.. OrderDetails is an array now