How to update value object into array in MongoDB Golang?

Question

I am trying to update my addresses into my person data:

if _, ok := update["addressName"]; ok {
  request = bson.M{"addresses": bson.M{"addressName": update["addressName"]}}
} else {
  request = update
}
_, err = people.UpdateOne(context.TODO(), filter, bson.M{"$set": request})

this doesn't create an object in the array,

I want to have a result like this:

{
 "updateAt": TIME_NOW
 "addresses": [
    {"addressName": "ONLY", default: true},
    {"addressName": "ONLY", default: true}
 ]
}

how is the correct way to request for an object in array with MongoDB Driver?

Burak Serdar · Accepted Answer · 2020-06-18 17:06:09Z

2

You are $setting the addresses to an array containing a single element. Either you have to set the addresses to an array containing all the elements you need, or you have to add to that array using $push:

_, err = people.UpdateOne(context.TODO(), filter, bson.M{"$push":bson.M{"addresses":bson.M{ address info }})

answered Jun 18, 2020 at 17:06

Burak Serdar

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14 Comments

Weq Iou Over a year ago

I follow that but not work: here is the request request = bson.M{"$push":bson.M{"addresses":bson.M{ "addressName": update["addressName"] }}}

Weq Iou Over a year ago

the address was null and then I update like your answer, it doesn't change, but after I $set array of data of it and then run your code , it was work, so is that mean we can't do like your syntax if that addresses in mongo null ?

Burak Serdar Over a year ago

I just tried as you said and it works. What version of mongodb are you using?

Burak Serdar Over a year ago

Is it null, or does it not exist? If it is null, it'll fail.

Weq Iou Over a year ago

MongoDB shell version v4.2.7, mongo-driver 1.3.4, did you create person data ? and make on addresses null not empty array ? and then run your code? I was like that and nothing happen

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