I am using the MongoDb Go Driver and I am unable to get the ObjectId subvalue from the JSON decoded in my structs.
Note: I am using a different library/API than this question, so please don't mark this as duplicate.
import (
"net/http"
"github.com/go-chi/chi"
"encoding/json"
"time"
"context"
"go.mongodb.org/mongo-driver/mongo"
"go.mongodb.org/mongo-driver/mongo/options"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/bson/primitive"
"fmt"
)
I have a type of struct like this for processing the results
type Contact struct {
Id struct {
ObjId string `json:"$oid"`
} `json:"_id"`
Name string `json:"name"`
Email string `json:"email"`
Health struct {
Weight int `json:"weight"`
Height int `json:"height"`
} `json:"health"`
}
And then I go to retrieve the contacts like this:
var contacts []Contact
ctx, _ := context.WithTimeout(context.Background(), 30*time.Second)
cursor, err := collection.Find(ctx, bson.M{})
if err != nil {
panic(err)
}
defer cursor.Close(ctx)
for cursor.Next(ctx) {
var contact Contact
fmt.Println(cursor)
cursor.Decode(&contact)
contacts = append(contacts, contact)
}
if err := cursor.Err(); err != nil {
panic(err)
}
// I want to do more with the contacts, but .Id is empty :-(
fmt.Println(contacts)
The subfields for "health"
appear exactly as they should, but for some reason the subfield from the "_id"
part of the results is nowhere to be found. Can anyone help me with this??
The JSON response from the database comes out like this, and for some reason I am able to get the subfields for the health
field, but not the _id
field. Why not?
Raw JSON response of DB
[{
"_id": {
"$obj": "5c601648ae25e40e2631c3ef"
},
"name": "Bob Smith",
"email": "bob@smith.com",
"health": {
"height": 192,
"weight": 85
}
}]
fmt.Println
's output of the decoded contacts
array:
[{{} Bob Smith bob@smith.com {192 85}}]