Update an array of objects mongoose

Question

I know that this question might be beginner level but I haven't find anything yet. I would like to update an array of objects with mongoose. I am interested in updating one object from the users array according to the index. Usually one user is getting changed at a time.

Here is my schema:

 _id: Schema.Types.ObjectId,
name: { type: String, required: true },
gm: {
    type: Schema.Types.ObjectId,
    ref: 'User',
    required: true
},
users: [],

I want to update an object in the users array which is like this:

{
    id:"5bcb7c7ff9c5c01b9482d244",
    gm:"5bcb7c7ff9c5c01b9482d246",
    name:"room 1"
    users: [
        {
            id:"5bcb7c7ff9c5c01b9482d243",
            stats:{
                power:10,
                mobility: 5,
                vitality: 20
            },
            bag:{itemSlot1: "Knife",itemSlot2:"Sword" }
        },
        {
            id:"5bcb7c7ff9c5c01b9482d241",
            stats:{
                power:10,
                mobility: 5,
                vitality: 20
            },
            bag:{itemSlot1: "Knife",itemSlot2:"Sword" }
    ]
}

I want to perform a patch or a post request to update one user each time from the user array. i am getting the id of the user from req.body to match it with my db.

My request is like this:

I would like to update based on a request like this:

data = {
  stats={
    power:"10",
    vitality:"20"
   }
}

Thanks in advance, Cheers

Akrion · Accepted Answer · 2018-10-20 22:23:12Z

1

You can do an update like this:

YourSchema.update({
  'users.id': '5bcb7c7ff9c5c01b9482d243'
}, {
  $set: {
    'users.$.stats': data.stats
  }
})

Which would update the first user with id 5bcb7c7ff9c5c01b9482d243 power stats to 20

This is using the update with the $ positional operator to update the element in the array.

Just have it set up in your post/patch request.

edited Oct 20, 2018 at 22:23

answered Oct 20, 2018 at 21:58

Akrion

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6 Comments

Akrion Over a year ago

Sure I updated the answer. Just set with the data.stats then.

AnHa Over a year ago

and what if i get a bag object as well and some key pairs are missing from the request?

Akrion Over a year ago

That is something you can do in your request before the update call. You can default values if the data does not have what you want etc. I am just providing the request to mongoose not the entire request handler.

AnHa Over a year ago

can i make a dynamic $set though and update only the values i get?

Akrion Over a year ago

You could simply compose your set object and just add the props you want to update like this: { 'users.$.stats.power': data.stats.power, 'users.$.stats.other': data.stats.other } based on what you have in data.stats

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