Can't create a nested struct

Question

I have to format a json in go and I have some problems. the string literal that I have used in java is the following:

 String jsonString= "{\"stream\":\"temperatura2\",\r\n" + "\"sensor\":\"ec6c613a-66b4-4584-fb37-5f7cac130f7d\",\r\n" + "\"values\":[{\"time\":\"2019-03-10T11:30:00Z\",\"components\":{\"alfanum\":\"99.0\"}}]}\r\n";

So I created this struct:

type YuccaDataStream struct { Stream string `json:"stream"` Sensor string `json:"sensor"` Values []struct { Time time.Time `json:"time"` Components struct { Alfanum string `json:"alfanum"` } `json:"components"` } `json:"values"` }

Is that struct correct? I don't know how to create an instance of that struct and fill it with the current time.

Possible duplicate of stackoverflow.com/questions/26866879/…. — user5728991
– user5728991, Commented Nov 28, 2019 at 20:35
I'm trying to learn go and I don't know named types, I will look. Thank you :) — gianpaolo
– gianpaolo, Commented Nov 28, 2019 at 21:04

user4466350 · Accepted Answer · 2019-11-28 20:41:01Z

don't do that.

package main import ( "fmt" "time" ) func main() { fmt.Println("Hello, playground") y := YuccaDataStream{ Values: []struct { Time time.Time Components struct { Alfanum string } }{ // struct { Time time.Time Components struct { Alfanum string } }{Time: time.Now(), Components: struct{ Alphanum string }{Alphanum: "aaa"}}, // struct { Time time.Time Components struct { Alfanum string } }{Time: time.Now(), Components: struct{ Alphanum string }{Alphanum: "bbb"}}, // }, } } type YuccaDataStream struct { Stream string `json:"stream"` Sensor string `json:"sensor"` Values []struct { Time time.Time `json:"time"` Components struct { Alfanum string `json:"alfanum"` } `json:"components"` } `json:"values"` }

ShayK · Accepted Answer · 2019-11-28 21:19:52Z

How about this:

package main import ( "fmt" "time" "encoding/json" ) type YuccaDataStream struct { Stream string `json:"stream"` Sensor string `json:"sensor"` Values []Value `json:"values"` } type Value struct { Time time.Time `json:"time"` Components `json:"components"` } type Components struct { Alfanum string `json:"alfanum"` } func main() { data := []byte(`{"stream": "temperatura2","sensor": "ec6c613a-66b4-4584-fb37-5f7cac130f7d","values": [{"time": "2019-03-10T11:30:00Z","components": {"alfanum": "99.0"}}]}`) var unmarshaled YuccaDataStream err := json.Unmarshal(data, &unmarshaled) if err != nil { panic(err) } fmt.Printf("%v",unmarshaled) }

try in go playground

Thank you. How do I use Yr syntax to insert for example the current time and then marshal?
If you want to marshal you can create a variable of type YuccaDataStream, fill the data and in the time field use time.Now.UTC(). then you can use json.Marshal.

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