Unmarshalling a complicated JSON ad bin it with a struct - go

Question

I have the following JSOn response from a webhook call
{
"responseId": "d5c70d8b-e8ad-41df-bb3b-26b0e51d60ca-a14fa99c",
"queryResult": {
"queryText": "1111111111",
"parameters": {
"phone-number": "1111111111"
},
"allRequiredParamsPresent": true,
"fulfillmentText": "Thats great! You payment link has been sent to Gaf ( Mobile number 1111111111 )",
"fulfillmentMessages": [{
"text": {
"text": ["Thats great! You payment link has been sent to Far ( Mobile number 1111111111 )"]
}
}],
"outputContexts": [{
"name": "projects/open-prod-bot-pfgibi/agent/sessions/80f2fb70-01d0-fc1d-200a-ccbae5572829/contexts/awaiting_name",
"lifespanCount": 2,
"parameters": {
"name": ["Gar"],
"name.original": ["Gar"],
"phone-number": "1111111111",
"phone-number.original": "1111111111"
}
}, {
"name": "projects/open-prod-bot-pfgibi/agent/sessions/80f2fb70-01d0-fc1d-200a-ccbae5572829/contexts/awaiting_number",
"lifespanCount": 4,
"parameters": {
"phone-number": "1111111111",
"phone-number.original": "1111111111"
}
}, {
"name": "projects/open-prod-bot-pfgibi/agent/sessions/80f2fb70-01d0-fc1d-200a-ccbae5572829/contexts/awaiting_name_confirm",
"lifespanCount": 3,
"parameters": {
"name": ["Gaf"],
"name.original": ["Far"],
"phone-number": "1111111111",
"phone-number.original": "1111111111"
}
}, {
"name": "projects/open-prod-bot-pfgibi/agent/sessions/80f2fb70-01d0-fc1d-200a-ccbae5572829/contexts/__system_counters__",
"parameters": {
"no-input": 0.0,
"no-match": 0.0,
"phone-number": "1111111111",
"phone-number.original": "1111111111"
}
}],
"intent": {
"name": "projects/open-prod-bot-pfgibi/agent/intents/d21f7be5-0f77-4cb8-9857-26ba04964317",
"displayName": "GetMobileNumber"
},
"intentDetectionConfidence": 1.0,
"languageCode": "en"
},
"originalDetectIntentRequest": {
"payload": {
}
},
"session": "projects/open-prod-bot-pfgibi/agent/sessions/80f2fb70-01d0-fc1d-200a-ccbae5572829"
}
I wanted to extract out
"outputContexts": [{
"name": "projects/open-prod-bot-pfgibi/agent/sessions/80f2fb70-01d0-fc1d-200a-ccbae5572829/contexts/awaiting_name",
"lifespanCount": 2,
"parameters": {
"name": ["Gar"],
"name.original": ["Gar"],
"phone-number": "1111111111",
"phone-number.original": "1111111111"
}
}
out of this and bind this with a struct. But I couldn't do it. I am trying to loop it through the map as below
var f interface{}
json.Unmarshal(b, &f)
for k, v := range f.(map[string]interface{}) {
if k == "queryResultmap" {
fmt.Println(v)
}
}
but not working. I am new to Go. Tried few examples in google but since this one is a complicated JSON I am unable to do it. Please help

Answer 1

I would suggest you declare a struct with the fields you care about and unmarshal into that, but if you want to stick to interface{} try this:
m := f.(map[string]interface{})
r := m["queryResult"].(map[string]interface{})
fmt.Println(r["outputContext"])
https://play.golang.com/p/gA5wWcPyd6E
Using struct:
type OutputContext struct {
Name string `json:"name"`
LifespanCount int `json:"lifespanCount"`
Parameters struct {
Name []string `json:"name"`
NameOriginal []string `json:"name.original"`
PhoneNumber string `json:"phone-number"`
PhoneNumberOriginal string `json:"phone-number.original"`
NoInput float64 `json:"no-input"`
NoMatch float64 `json:"no-match"`
} `json:"parameters"`
}
type QueryResult struct {
OutputContexts []OutputContext `json:"outputContexts"`
}
// ...
var dest struct {
QueryResult QueryResult `json:"queryResult"`
}
if err := json.Unmarshal(data, &dest); err != nil {
panic(err)
}
for _, v := range dest.QueryResult.OutputContexts {
fmt.Printf("%+v\n", v)
}
https://play.golang.com/p/EfIugDQJ651