Unmarshmaling json to nested struct

Question

I have different json byte inputs that I need to unmarshal into a nested json structure. I am able to unmarshal the json into the struct App. However I am unable to add to "status" struct.

I tried to unmarshal, but that doesnt work since my app1 & app2 are of type App instead of bytes. And trying to set directly gives the error "cannot use app1 (type App) as type []App in assignment"

package main import ( "encoding/json" "fmt" "reflect" ) type App struct { Appname string `json:"appname"` Builds string `json:"builds"` } type Status struct { Apps []App `json:"apps"` } func main() { jsonData1 := []byte(` { "appname": "php1", "buildconfigs":"deleted" } `) jsonData2 := []byte(` { "appname": "php2", "buildconfigs":"exists" } `) // unmarshal json data to App var app1 App json.Unmarshal(jsonData1, &app1) var app2 App json.Unmarshal(jsonData2, &app2) var status Status //json.Unmarshal(app1, &status) //json.Unmarshal(app2, &status) status.Apps = app1 status.Apps = app2 fmt.Println(reflect.TypeOf(app1)) fmt.Println(reflect.TypeOf(app1)) }

CrazyCrow · Accepted Answer · 2016-04-01 08:22:32Z

You can't assign single element to array field so convert your

status.Apps = app1 status.Apps = app2

to something like

status.Apps = []App{app1, app2}

or

status.Apps = []App{} status.Apps = append(status.Apps, app1) status.Apps = append(status.Apps, app2)

Also your JSON field named buildconfigs and in struct specification json:"builds". Structure's field always will be empty in this case.

Working example http://play.golang.org/p/fQ-XQsgK3j

Thanks. I think status.Apps = append(status.Apps, app1) works for my use case as I can invoke it in a loop.

nevets · Accepted Answer · 2016-04-01 08:49:15Z

Your question is a bit confusing to me :s But if you modify your JSON data to an JSON array and it will work with Unmarshal and could be unmarshal to status with no problems:

func main() { jsonData1 := []byte(` { "apps": [{ "appname": "php1", "buildconfigs":"deleted" },{ "appname": "php2", "buildconfigs":"exists" }] } `) var status Status json.Unmarshal(jsonData1, &status) fmt.Printf("%+v\n", status) }

Working example here: http://play.golang.org/p/S4hOxJ6gHz

That is true. But I am getting the app information from another package. And I need to build the struct for status for multiple calls.

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