Only update specific values using updateOne $set in mongoose-CodePudding

I want to only update two values inside todo in the Mongoose model below

const userSchema = new mongoose.Schema({
    name: String,
    email: String,
    phone: Number,
    points: Number,
    todo: {

    }
})

The todo actually contains 11 values and I only want to update 2 values at a time which I am getting from the frontend

let {
    t,
    i
} = req.body.delitem;
await User.updateOne({
    username: req.body.user
}, {
    $set: {
        todo: {
            [t]: "",
            [i]: ""
        }
    }
})

but what is happening is these two fields are getting set to blank strings but the remaining fields are also changing to NULL whereas I want the other fields to stay the same.

CodePudding user response：

Use dot notation like this:

await User.updateOne({username:req.body.user},
{
  "$set": {
    "todo.t": "",
    "todo.i": ""
  }
})

Example here

If you use an object into $set you are telling mongo to replace the object by the new one.

CodePudding user response：

I believe your issue is that you're using $set and passing a whole object which overwrites the whole todo with your t and i fields and you've enforced required on those other fields.

If you see the docs in mongo for $set you can instead update specific fields in subobjects. The following snippet should be more appropriate.

let {t,i} = req.body.delitem;
await User.updateOne({username:req.body.user}, {
  $set: { 
    "todo.t": "",
    "todo.i": ""
  }
})