merge two map[string]interface{} from json - json

Question

I have two json inputs built this way
"count: 1 result: fields"
I would like to concatenate the fields that I find within result without using a defined structure. I have tried in many ways but most of the time the result is an error about the type Interface {} or the last map overwritten the data
I would like both the "result" and the first and second map fields to be merged within the result in output.
oracle, err := http.Get("http://XXX:8080/XXXX/"+id)
if err != nil {
panic(err)
}
defer oracle.Body.Close()
mysql, err := http.Get("http://XXX:3000/XXX/"+id)
if err != nil {
panic(err)
}
defer mysql.Body.Close()
oracleJSON, err := ioutil.ReadAll(oracle.Body)
if err != nil {
panic(err)
}
mysqlJSON, err := ioutil.ReadAll(mysql.Body)
if err != nil {
panic(err)
}
var oracleOUT map[string]interface{}
var mysqlOUT map[string]interface{}
json.Unmarshal(oracleJSON, &oracleOUT)
json.Unmarshal(mysqlJSON, &mysqlOUT)
a := oracleOUT["result"]
b := mysqlOUT["result"]
c.JSON(http.StatusOK, gin.H{"result": ????})
this is an example of json
{"count":1,"result":{"COD_DIPENDENTE":"00060636","MATRICOLA":"60636","COGNOME":"PIPPO"}}
If i have two json like this the result of the function it should be
`"result":{"COD_DIPENDENTE":"00060636","MATRICOLA":"60636","COGNOME":"PIPPO","COD_DIPENDENTE":"00060636","MATRICOLA":"60636","COGNOME":"PIPPO"}}`

Answer 1

The output you are looking for is not valid JSON. However with a small change you can output something very similar to your example that is valid JSON.
You probably do want to use a defined structure for the portion of the input that has a known structure, so that you can extract the more abstract "result" section more easily.
If you start at the top of the input structure using a map[string]interface{} then you'll have to do a type assertion on the "result" key. For example:
var input map[string]interface{}
err = json.Unmarshal(data, &input)
if err != nil {
return err
}
keys, ok := input["result"].(map[string]interface{})
if !ok {
return errors.New("wasn't the type we expected")
}
However if you used a defined structure for the top level you can do it like the following which feels much cleaner.
type Input struct {
Count int `json:"count"`
Result map[string]interface{} `json:"result"`
}
var input Input
err = json.Unmarshal(data, &input)
if err != nil {
return err
}
// from here you can use input.Result directly without a type assertion
To generate output that has duplicate keys, you could use an array of objects with a single key/value pair in each, then you end up with a valid JSON structure that does not overwrite keys. Here's how to do that (playground link):
package main
import (
"encoding/json"
"fmt"
)
type Input struct {
Count int `json:"count"`
Result map[string]interface{} `json:"result"`
}
type Output struct {
Count int `json:"count"`
Result []map[string]interface{} `json:"result"`
}
var inputdata = [][]byte{
[]byte(`{"count":1,"result":{"COD_DIPENDENTE":"00060636", "MATRICOLA":"60636", "COGNOME":"PIPPO"}}`),
[]byte(`{"count":1,"result":{"COD_DIPENDENTE":"00060636", "MATRICOLA":"60636", "COGNOME":"PIPPO"}}`),
}
func main() {
inputs := make([]Input, len(inputdata))
for i := range inputs {
err := json.Unmarshal(inputdata[i], &inputs[i])
if err != nil {
panic(err)
}
}
var out Output
out.Count = len(inputs)
for _, input := range inputs {
for k, v := range input.Result {
out.Result = append(out.Result, map[string]interface{}{k: v})
}
}
outdata, _ := json.Marshal(out)
fmt.Println(string(outdata))
}
Which produces output that looks like this when formatted:
{
"count": 2,
"result": [
{"MATRICOLA": "60636"},
{"COGNOME": "PIPPO"},
{"COD_DIPENDENTE": "00060636"},
{"COGNOME": "PIPPO"},
{"COD_DIPENDENTE": "00060636"},
{"MATRICOLA": "60636"}
]
}