如何在实例方法中更新Mongoose子文档? [英] How can I update a Mongoose subdocument in an instance method?

问题描述

我有一个Mongoose文档，其中包含一系列子文档，如下所示:

I have a Mongoose document with an array of subdocuments like this:

var RegionSchema = new Schema({
  "metadata": {
    "regionType": String,
    "name": String,
    "children": [{
      "name": String,
      "childType": String,
      "id": Schema.ObjectId
    }],
    "parent": Schema.ObjectId
  },

  "data": [DataContainer]
});

在DataContainer模式中，我想创建一个实例方法来更新其内部的数据.

In the DataContainer schema, I want to make an instance method that can update the data inside itself.

为清楚起见，我希望能够查找Region，在data数组中找到一个DataContainer，并调用类似dataCont.update()的名称，其中实例可以执行this.save().这可能吗?

For clarity, I want to be able to look up a Region, find a DataContainer inside the data array and call something like dataCont.update(), in which the DataContainer instance can do a this.save(). Is this possible?

做

this.save(function(err, saved) {
  console.log(saved)
  callback(err, saved);
});

在DataContainer实例方法内部的

打印出undefined.回调被击中.

inside a DataContainer instance method prints out undefined. The callback is hit though.

推荐答案

如果data属性是子文档，则可以轻松使用populate并对其进行更新:

If the data property is a subdocument you can easily use populate and update it:

Region.findOne({ _id: regionId })
  .populate('data')
  .exec(function (err, region) {
    // ...

    var data = region.data, // data container
        dataItem = data[0];

    dataItem.property = 'some value';
    dataItem.save(function (err, item) {
      //...
    });

    // or
    dataItem.update({ $set: { property: 'some value' }}, function (err, item) {
      // ...
    });

  });

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