Insert nested structures in MongoDb with Golang

Question

I have a question regarding storage in MongoDB using mgo.

My DB has this structure :

{
  "Arrival": [
    "04-09-2016"
  ],
  "Clicks": [
    "56ffd41d9c8c9adf088b4576",
    "4f1dc63a7c2d3817640000a1"
  ],
  "Recherches": [
    "érysipèle"
  ],
  "abonnements": {
    "newsletter": false
  },
  "compte": "Standard",
  "datei": ISODate("2016-09-04T14:55:39.179Z"),
  "email": "_°°°°_",
  "mdp": "27d8d166ca1f1715541b7df6453401b95a1d59c2ca0f60ce71037d33926c4d6f09a63a909a8d5cb5230f92584973a4dd2b8bcf155d5785ef7e2afdd113334eee",
  "type": "T&D",
  "user": "_°°°°_",
  "validation": "validé"
}

In my Go application the structures are :

type Abonnement struct {
    Newsletter bool bson:"newsletter"'
  }

type Persone struct {
    Compte string 'bson:"compte"'
    Datei time.Time 'bson:"datei"'
    Email string  'bson:"email"'
    MDP string 'bson:"mdp"'
    Type string 'bson:"T&D"'
    User string 'bson:"user"'
    Validation string 'bson:"validation"'
    Arrival []string 'bson:"Arrival"'
    Clicks []string 'bson:"Clicks"'
    Recherches []string 'bson:"Recherches"'
    Abonnements []Abonnement 'bson:"abonnements"'
  }

But I can't manage to create the variable to put everything together :

personita := Persone{
      Compte : "Standard",
      Datei : time.Date(2015, time.February, 12, 04, 11, 0, 0, time.UTC),
      Email : "test@test.com",
      MDP : "test_mdp",
      Type : "T&D",
      User : "test_user",
      Validation : "validé",
      Arrival  : []string{},
      Clicks : []string{},
      Recherches : []string{},
      Abonnements : []Abonnement{},
    }

My main goal would be that there's a default value when I insert 'personita' with this inside :

"abonnements": {
    "newsletter": false
  }

Answer 1

The solution for having Nested structures is to do:

type Abonnement struct {
  Newsletter bool `bson:"newsletter"`
  StripeID string `bson:"stripe_id,omitempty"`
  StripeSub string `bson:"stripe_sub,omitempty"`
}

type Personne struct {
  Compte string `bson:"compte"`
  Datei time.Time `bson:"datei"`
  Email string  `bson:"email"`
  MDP string `bson:"mdp"`
  Type string `bson:"T&D"`
  User string `bson:"user"`
  Validation string `bson:"validation"`
  Arrival []string `bson:"Arrival"`
  Clicks []string `bson:"Clicks"`
  Recherches []string `bson:"Recherches"`
  Abonnements Abonnement `bson:"abonnements"`
}

and then :

personita := Personne{
    Compte : "Standard",
    Datei : time.Date(2015, time.February, 12, 04, 11, 0, 0, time.UTC),
    Email : "test@test.com",
    MDP : "test_mdp",
    Type : "T&D",
    User : "test_user",
    Validation : "validé",
    Abonnements : Abonnement{false,"",""},
   }

if err := coll.Insert(personita); err != nil {panic(err)}

This way you have the nested JSON added to MongoDB with default values.

Furthermore, in this particular case, StripeID or StripeSub are optional, hence if the value is empty they won't appear on your database.

Answer 2

Maybe something like this. First define a function that returns a pointer to the structure:

func NewAbonnement()(ab *Abonnement){
    return &Abonnement{Newsletter: false}
}

Then call the function as Abonnement slice literal:

 personita := Persone{
      Compte : "Standard",
      Datei : time.Date(2015, time.February, 12, 04, 11, 0, 0, time.UTC),
      Email : "test@test.com",
      MDP : "test_mdp",
      Type : "T&D",
      User : "test_user",
      Validation : "validé",
      Arrival  : []string{},
      Clicks : []string{},
      Recherches : []string{},
      Abonnements : []Abonnement{*NewAbonnement()},
    }

Playground

Answer 3

Seems just a typo

Abonnements : []Abonnement{}