mongodb 添加子实体-子文档数据-nodejs

//1对多
const childSchema = new Schema({
        msg: []
});
const parentSchema = new Schema({
        id: 'string',
        children: [childSchema]
})

const c = await model.Parent.findOneAndUpdate({
            id: 'id1'
        }, {
            $push: { //更新子数据
                children: datas
            }
        }, {
            upsert: true, // 查不到，则添加新数据
        })