How to write insert golang code? - go

Question

Here Is my json file and i want to insert the data using golang and
mgo in this json format
[{
"_id" : ObjectId("57307906f051147d5317984e"),
"dateAdded" : " 20015-11-10 23:00:00 +0000 UTC"
"firstName" : "chetan",
"lastName" : "kumar",
"age" : 23,
"user" : [
{
"userid" : ObjectId("57307906f051147d5317984a"),
"firstName" : "chetan",
"lastName" : "kumar",
"age" : 23
},
{
"userid" : ObjectId("57307906f051147d5317984b"),
"firstName" : "nepolean",
"lastName" : "dang",
"age" : 26
},
{
"userid" : ObjectId("57307906f051147d5317984c"),
"firstName" : "Raj",
"lastname" : "kumar",
"age" : 26
}
],
"sales" : [
{
"salesid" : ObjectId("57307906f051147d5317984d"),
"firstName" : "ashu",
"lastName" : "jha",
"age" : 27
}
]
}]
Now ,here is my go file which i was trying to insert data through
golang and mgo
package main
import(
"fmt"
"time"
"net/http"
"github.com/gorilla/mux"
"gopkg.in/mgo.v2"
"gopkg.in/mgo.v2/bson"
)
type userinfo struct{
ID bson.ObjectId `json:"_id" bson:"_id"`
USER []User `json:"user" bson:"user"`
SALES []Sales `json:"sales" bson:"sales"`
DATEADDED time.Time `json:"dateAdded" bson:"dateAdded"`
NAME string `json:"name" bson:"name"`
}
type User struct{
USERID bson.ObjectId `json:"userid" bson:"userid"`
FIRSTNAME string `json:"firstName" bson:"firstName"`
LASTNAME string `json:"lastName" bson:"lastName"`
AGE int `json:"age" bson:"age"`
}
type Sales struct{
SALESID bson.ObjectId `json:"salesid" bson:"salesid"`
FIRSTNAME string `json:"firstName" bson:"firstName"`
LASTNAME string `json:"lastName" bson:"lastName"`
AGE int `json:"age" bson:"age"`
}
func post(w http.ResponseWriter,r *http.Request){
session,err := mgo.Dial("127.0.0.1")
if err != nil{
panic(err)
}
defer session.Close()
session.SetMode(mgo.Monotonic,true)
c:= session.DB("userdb").C("user")
fmt.Fprintln(w,"conn")
err = c.Insert(&userinfo{ID:new ObjectId(),NAME:"Admin",USER:{USERID:new ObjectId(), FIRSTNAME: "sam",LASTNAME : "billing",AGE : 25},SALES:{SALESID:new ObjectId(),FIRSTNAME : "joe",LASTNAME : "root",AGE : 23},DATEADDED:time.Now()})
if err != nil {
panic(err)
}
}
func main(){
router := mux.NewRouter().StrictSlash(true)
router.HandleFunc("/post/",post)
http.ListenAndServe(":8080",router)
}
but it's not work at all please help me out

Answer 1

There is so much wrong with this.
package main
import (
"encoding/json"
"fmt"
"log"
"net/http"
"time"
"github.com/gorilla/mux"
"gopkg.in/mgo.v2"
"gopkg.in/mgo.v2/bson"
)
type Userinfo struct {
ID bson.ObjectId `bson:"_id,omitempty" json:"id"`
USER []string `json:"user" bson:"user"`
SALES []string `json:"sales" bson:"sales"`
DATEADDED time.Time `json:"dateAdded" bson:"dateAdded"`
NAME string `json:"name" bson:"name"`
}
type User struct {
ID bson.ObjectId `bson:"_id,omitempty" json:"id"`
FIRSTNAME string `json:"firstName" bson:"firstName"`
LASTNAME string `json:"lastName" bson:"lastName"`
AGE int `json:"age" bson:"age"`
}
type Sales struct {
ID bson.ObjectId `bson:"_id,omitempty" json:"id"`
FIRSTNAME string `json:"firstName" bson:"firstName"`
LASTNAME string `json:"lastName" bson:"lastName"`
AGE int `json:"age" bson:"age"`
}
var session *mgo.Session
func main() {
var err error
session, err = mgo.Dial("127.0.0.1")
if err != nil {
panic(err)
}
defer session.Close()
session.SetMode(mgo.Monotonic, true)
fmt.Fprintln(w, "conn")
router := mux.NewRouter().StrictSlash(true)
router.HandleFunc("/post/", post)
router.HandleFunc("/getusers/", getusers)
http.ListenAndServe(":8080", router)
}
func post(w http.ResponseWriter, r *http.Request) {
ms := session.Copy()
defer ms.Close()
cui := session.DB("userdb").C("userinfo")
cu := session.DB("userdb").C("user")
cs := session.DB("userdb").C("sales")
u := User{FIRSTNAME: "sam", LASTNAME: "billing", AGE: 25}
s := Sales{FIRSTNAME: "joe", LASTNAME: "root", AGE: 23}
if e := cu.Insert(u); e != nil {
log.Println(e.Error)
w.WriteHeader(500)
return
}
if e := cs.Insert(s); e != nil {
log.Println(e.Error)
w.WriteHeader(500)
return
}
ui := new(Userinfo)
ui.ID = bson.NewObjectId()
ui.NAME = "admin"
ui.USER = []string{u.Id.Hex()}
ui.SALES = []string{s.Id.Hex()}
ui.DATEADDED = time.Now()
if e := cui.Insert(ui); e != nil {
log.Println(e.Error)
w.WriteHeader(500)
return
}
w.WriteHeader(201)
}
func getusers(w http.ResponseWriter, r *http.Request) {
ms := session.Copy()
defer ms.Close()
cui := session.DB("userdb").C("userinfo")
cu := session.DB("userdb").C("user")
cs := session.DB("userdb").C("sales")
// Query for users of userinfo
uadm := new(Userinfo)
if e := cui.Find(bson.M{"name": "admin"}).One(uadm); e != nil {
log.Println(e.Error)
}
for _, userid := range uadm.USER {
tempu := new(User)
if e := cu.Find(bson.M{"_id": bson.ObjectIdHex(userid)}).One(tempu); e != nil {
log.Println(e.Error)
w.WriteHeader(500)
return
}
enc := json.NewEncoder(w)
if e := enc.Encode(tempu); e != nil {
log.Println(e.Error)
w.WriteHeader(500)
return
}
}
}
The session
Separate collections for all models
I've changed the user and sales fields of Userinfo into []string because every independantly editable and queryable model should have its own collection. Instead of the whole object the id reference is saved so you can query for a user by ObjectId.
Userinfo should be uppercase

Answer 2

Your syntax is off, in several places. However the code is messy so I'll split it like that:
users := {USERID: new ObjectId(), FIRSTNAME: "sam",LASTNAME: "billing", AGE: 25}
sales := {SALESID: new ObjectId(),FIRSTNAME: "joe", LASTNAME: "root", AGE: 23}
info := &userinfo{ID:new ObjectId(), NAME:"Admin", USER: users, SALES: sales, DATEADDED: time.Now()}
About the creation of sales and user, this is not the right way to create a slice and a struct. Instantiation of a struct of type T in Golang is T{}. You can create slices the same way. Therefore the sales and users become
users := []User{User{USERID: new ObjectId(), FIRSTNAME: "sam",LASTNAME: "billing", AGE: 25}}
sales := []Sales{Sales{SALESID: new ObjectId(),FIRSTNAME: "joe", LASTNAME: "root", AGE: 23}}
Then, you should take a look at mgo's documentation. The way of creating an ObjectId is bson.NewObjectId(). Now, with all the modifications:
func main() {
users := []User{User{USERID: bson.NewObjectId(), FIRSTNAME: "sam", LASTNAME: "billing", AGE: 25}}
sales := []Sales{Sales{SALESID: bson.NewObjectId(), FIRSTNAME: "joe", LASTNAME: "root", AGE: 23}}
info := &userinfo{ID: bson.NewObjectId(), NAME: "Admin", USER: users, SALES: sales, DATEADDED: time.Now()}
data, _ := json.MarshalIndent(info, "", " ")
fmt.Println(string(data))
}
/* Prints
{
"_id": "57402f27e13823740d742417",
"user": [
{
"userid": "57402f27e13823740d742415",
"firstName": "sam",
"lastName": "billing",
"age": 25
}
],
"sales": [
{
"salesid": "57402f27e13823740d742416",
"firstName": "joe",
"lastName": "root",
"age": 23
}
],
"dateAdded": "2016-05-21T11:49:27.507636096+02:00",
"name": "Admin"
}
*/