mgo collection.Find(nil).All(&users) not working

Question

I'm having the next issue.. I can't get all records from my mongo database (running in a docker containner), here is my really simple code:

type User struct {
    Email string `json:"email" bson:"email"`
    Pass  string `json:"pass" bson:"pass"`
}

session := dbConnect()
collection := session.DB("my_db").C("users")
var users []User
err := collection.Find(nil).All(&users)
if err != nil {
    log.Fatal("Mongo collection find fail: ", err)
}
fmt.Println("Results >> ", err)

The thing is "err" returns <nil>. Something weird is that inserting documents on the database actually works. Thank you!

well is the zero value for an empty slice and there is no errors, so it seems that your collection 'users' is empty — Yandry Pozo, Oct 11 '16 at 03:14
but in the mongo shell, if I run `use my_db` and then `db.users.find()`, it returns several json documents.. — Gerardo Tarragona, Oct 11 '16 at 05:23

score 1 · Accepted Answer · answered Oct 11 '16 at 08:51

There is no issue with your code, but the last line fmt.Println("Results >> ", err), shouldn't it be fmt.Println("Results >> ", users) ?

Also you can check if collection is not empty and fields are correct by using interface

session := dbConnect()
    collection := session.DB("my_db").C("users")
    var v []interface{}
    err := collection.Find(nil).All(&v)
    if err != nil {
        log.Fatal("Mongo collection find fail: ", err)
    }
    fmt.Println("Results >> ", v)

You're right, thank you. I'm just getting used to pointers and references in Go. — Gerardo Tarragona, Oct 11 '16 at 20:27

mgo collection.Find(nil).All(&users) not working

1 Answers1