猫鼬（mongodb）$ push数据作为子文档，是否唯一？

Question

I have a User document which has a Notes subdocument. I'm using the following code to push new notes for the user with the given email address.

UserSchema.statics.addNotesToUser = function (email, notes, callback) {
    return this.updateOne(
        {'email': email},
        {$push: {notes}},
        callback
    )
};

This is working fine, however it's ignoring my unique constraint on the NoteSchema. these are my schemas

const NoteSchema = new Schema({
    _id: false,
    id: {type: String, required: true, trim: true, unique: true},
    content: {type: String, required: true, trim: true, lowercase: true},
    added: {type: Date, default: Date.now},
    used: {type: Date, default: Date.now},
    book: {
        name: {type: String, required: true}
    }
});

const UserSchema = new Schema({
    email: {type: String, required: true, trim: true, lowercase: true, unique: true},
    notes: [NoteSchema]
});

I'm wondering how I can make sure that when pushing new notes to my user, I can validate if the ID of the notes is unique.

Thank you.

Answer 1

To achieve uniqueness constraint like functionality in subdocuments, hope that's OK.

  let notesId = [];
    notes.forEach(function(val,index){
       notesId.push(val.id)
    })
    db.yourCollection.update(
         { 'email': email, 'NoteSchema.id': { '$ne': { $each: notesId } }},
         {$push: {notes} },
        callback)