英文:
Access data json in golang
问题
我有以下的JSON文档：
{
id: int
transaction_id: string
total: string
line_items: [
{
id: int
name: string
}
]
}
这是我的代码：
type Order struct {
ID int `json:"id"`
TransactionId string `json:"transaction_id"`
Total string `json:"total"`
LineItems []interface{} `json:"line_items"`
}
...
var order Order
json.Unmarshal([]byte(sbody), &order)
for index, a := range order.LineItems {
fmt.Println(a["name"])
}
我得到了错误信息：
invalid operation: cannot index a (variable of type interface{})
我应该创建一个Item结构体吗？
英文:
I have the following JSON document:
{
id: int
transaction_id: string
total: string
line_items: [
{
id: int
name: string
}
]
}
This is my code
type Order struct {
ID int `json:"id"`
TransactionId string `json:"transaction_id"`
Total string `json:"total"`
LineItems []interface{} `json:"line_items"`
}
...
var order Order
json.Unmarshal([]byte(sbody), &order)
for index, a := range order.LineItems {
fmt.Println(a["name"])
}
I got the error:
invalid operation: cannot index a (variable of type interface{})
Should I create an Item struct?
答案1
得分: 1
将LineItems字段的类型修改为[]map[string]interface{}。
package main
import (
"encoding/json"
"fmt"
)
func main() {
type Order struct {
ID int `json:"id"`
TransactionId string `json:"transaction_id"`
Total string `json:"total"`
LineItems []map[string]interface{} `json:"line_items"`
}
var order Order
err := json.Unmarshal([]byte(`{
"id": 1,
"transaction_id": "2",
"total": "3",
"line_items": [
{
"id": 2,
"name": "444"
}
]
}`), &order)
if err != nil {
panic(err)
}
for _, a := range order.LineItems {
fmt.Println(a["name"])
}
}
英文:
Modify the LineItems field type to []map[string]interface{}.
package main
import (
"encoding/json"
"fmt"
)
func main() {
type Order struct {
ID int `json:"id"`
TransactionId string `json:"transaction_id"`
Total string `json:"total"`
LineItems []map[string]interface{} `json:"line_items"`
}
var order Order
err := json.Unmarshal([]byte(`{
"id": 1,
"transaction_id": "2",
"total": "3",
"line_items": [
{
"id": 2,
"name": "444"
}
]
}`), &order)
if err != nil {
panic(err)
}
for _, a := range order.LineItems {
fmt.Println(a["name"])
}
}
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