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 : "[email protected]",
      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
  }

How can I add the default value for abonnements? "abonnements": { "newsletter": false } @Sridhar — Juanse
– Juanse, Commented Sep 4, 2016 at 21:48

Uvelichitel · Accepted Answer · 2016-09-04 21:33:31Z

1

Seems just a typo

Abonnements : []Abonnement{}

answered Sep 4, 2016 at 21:33

Uvelichitel

8,5481 gold badge21 silver badges37 bronze badges

Sign up to request clarification or add additional context in comments.

6 Comments

Juanse Over a year ago

How can I add the default value for abonnements? @uvelichitel "abonnements": { "newsletter": false }

Uvelichitel Over a year ago

Abonnements : []Abonnement{{false}}

Juanse Over a year ago

The problem with this solution is that it creates : "abonnements": [ { "newsletter": false } ] and I would like : {"abonnements": { "newsletter": false } }

Uvelichitel Over a year ago

You define Abonnements as slice of Abonnement in Person struct. So it initialized as slice and than marshalled in bson array.

Uvelichitel Over a year ago

Abonnements : Abonnement{false}

|

kingSlayer · Accepted Answer · 2016-09-04 22:23:22Z

1

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 : "[email protected]",
      MDP : "test_mdp",
      Type : "T&D",
      User : "test_user",
      Validation : "validé",
      Arrival  : []string{},
      Clicks : []string{},
      Recherches : []string{},
      Abonnements : []Abonnement{*NewAbonnement()},
    }

Playground

edited Sep 4, 2016 at 22:23

answered Sep 4, 2016 at 22:11

kingSlayer

1,2091 gold badge11 silver badges21 bronze badges

2 Comments

Juanse Over a year ago

The problem with this solution is that it creates : "abonnements": [ { "newsletter": false } ] and I would like : {"abonnements": { "newsletter": false } }

kingSlayer Over a year ago

In the edit I made a map, then marshaled the map to json and assigned the string to Abonnments as string.

Juanse · Accepted Answer · 2016-09-11 13:47:58Z

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 : "[email protected]",
    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.

Collectives™ on Stack Overflow

Insert nested structures in MongoDb with Golang

3 Answers 3

6 Comments

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

6 Comments

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related