go语言中使用struct解析嵌套的json

{"action":"add","business":{"listid":123,"objecttags":[{"tagcode":"csharp","tagname":"codename","tagvalue":["2"],"tagtype":3},{"tagcode":"golang","tagname":"coding","tagvalue":["3"],"tagtype":3}]}}

package main

import (
    "encoding/json"
    "fmt"
)


type objecttagslist struct {
    tagcode  string
    tagname  string
    tagvalue []string
}

type model struct {
    action   string `json:"action"`
    business struct {
        listid     int64  `json:"listid"`
        objecttags []objecttagslist `json:"objecttags"`
    } `json:"business"`
}

func main() {
    json := `{"action":"add","business":{"listid":123,"objecttags":[{"tagcode":"csharp","tagname":"codename","tagvalue":["2"],"tagtype":3},{"tagcode":"golang","tagname":"coding","tagvalue":["3"],"tagtype":3}]}}`

    var model model
    json.unmarshal([]byte(json), &model)

    fmt.println(model.action) // this prints correctly as "add"
        fmt.println(model.business.listid) // this prints correctly as "123"


    fmt.println(model.business.objecttags) // this does not print the objecttags. rather this prints the objecttags as "[{  []} {  []}]"


}

var object []objecttagslist

//this gives error as cannot convert model.business.objecttags (variable of type []objecttagslist) to type []byte

json.unmarshal([]byte(model.business.objecttags), &object)

fmt.println(object)

model.Business.ObjectTags[0].tagCode //--> Should print/store "csharp"
model.Business.ObjectTags[0].tagValue[0] //--> Should print/store "2"

package main

import (
    "encoding/json"
    "fmt"
)

type objecttagslist struct {
    tagcode  string
    tagname  string
    tagvalue []string
}

type model struct {
    action   string `json:"action"`
    business struct {
        listid     int64            `json:"listid"`
        objecttags []objecttagslist `json:"objecttags"`
    } `json:"business"`
}

func main() {
    json := `
{
  "action": "add",
  "business": {
    "listid": 123,
    "objecttags": [
      {
        "tagcode": "csharp",
        "tagname": "codename",
        "tagvalue": [
          "2"
        ],
        "tagtype": 3
      },
      {
        "tagcode": "golang",
        "tagname": "coding",
        "tagvalue": [
          "3"
        ],
        "tagtype": 3
      }
    ]
  }
}
`

    var model model
    json.unmarshal([]byte(json), &model)

    fmt.println(model.action)
    fmt.println(model.business.listid)

    fmt.println(model.business.objecttags)
}

add
123
[{csharp codename [2]} {golang coding [3]}]

type ObjectTagsList struct {
    TagCode  string   `json:"tagCode"`
    TagName  string   `json:"tagName"`
    TagValue []string `json:"tagValue"`
}