go.mongodb.org/mongo-driver - InsertOne with NilValueObjectId - mongodb

Question

I have the following struct
type Account struct {
ID primitive.ObjectID `json:"id" bson:"_id"`
Email string `json:"email"`
Password string `json:"password"`
}
and the following function
func (a *Account) Create() map[string]interface{} {
if resp, ok := a.Validate(); !ok {
return resp
}
hashedPassword, _ := bcrypt.GenerateFromPassword([]byte(a.Password), bcrypt.DefaultCost)
a.Password = string(hashedPassword)
users := db.Collection("users")
insertResult, err := users.InsertOne(context.TODO(), a)
if err != nil {
return utils.Message(false, "Error inserting user document "+err.Error())
}
... more code down hre
}
The problem I am having is that I can insert the first account, but any account after that can't be inserted due to a dup key error on the _id field. I know that mongoDB will auto generate an _id field and will use the one provided if there is an id. In my case in this create function, the a.ID (_id) is always be NilValue "_id" : ObjectId("000000000000000000000000")
Is there any way mongoDB can generate an _id for me even if I provide and ID field with the nil value?
I need the Account.ID `bson: "_id"` property on there so I can decode it when I am reading from mongoDB such as
func GetUser(email string) *Account {
account := &Account{}
users := db.Collection("users")
filter := bson.D{{"email", email}}
if err := users.FindOne(context.TODO(), filter).Decode(&account); err != nil {
return utils.Message(false, "Error Retrieving account for "+email)
}
// account.ID will be available due to the bson tag
}
I'd appreciate some feedback if I am doing this wrong and how I could do this better.
Thanks!

Answer 1

I found the problem. I did not add ```omitempty` to the bson tag.
It should be
type Account struct {
ID primitive.ObjectID `json:"id" bson:"_id,omitempty"`
Email string `json:"email"`
Password string `json:"password"`
}