mongodb - 如何根据嵌套的属性值查找（第一层属性值是数组）？

Question

示例代码如下：

var UserSchema = new Schema({
    interactions: [{
        interactor: {
            type: Schema.Types.ObjectId,
            ref: 'User'
        }
    }]
});

我现在想根据userId匹配所有interactor的值为userId的interaction，用mongoose如何能做到呢？

Answer 1

I found a solution to the matching problem, which is very intuitive:

User.find({
    'interactions.interactor': mongoose.Types.ObjectId(user._id)
}, function (err, users) {
}

But in the callback function, I will update multiple matching users. How should I save it after the update? If there is no users.save() method, do I have to write loop save myself?