猫鼬子文档访问

Question

您将如何访问已找到文档中的子文档？

假设我创建了以下模型：

const mongoose = require('mongoose');
const schema = mongoose.Schema;

const barStructure = {
    name: { type: String, require: true }
}

const fooStructure = {
    name: { type: String, require: true },
    bar: { type: schema.ObjectId, ref: 'bar', require: false }
}

var BarModel = mongoose.model('Bar', schema(barStructure));
var FooModel = mongoose.model('Foo', schema(fooStructure));

然后创建：

FooModel.create({ name: 'name', bar: new BarModel({ name: 'name' }) });

现在如何从父母那里访问bar ？

FooModel.findOne({ name: 'name' }, (err, result) => {
    //How can I access bar here?
});

Answer 1

您可以使用猫鼬查询填充功能：

fooModel
  .findOne({ name: 'name' })
  .populate('bar')
  .exec((err, foo) => {
    if (err) return handleError(err);
    console.log(foo.bar): // Access sub model
  });