如何填充子文档中的模型实例数组？MongoDB猫头鹰

// 子文档模型
const childSchema = new Schema({
  name: String,
  age: Number
});

// 主文档模型
const parentSchema = new Schema({
  children: [{ type: Schema.Types.ObjectId, ref: 'Child' }]
});

// 创建子文档
const Child = mongoose.model('Child', childSchema);
const child1 = new Child({ name: 'Alice', age: 5 });
const child2 = new Child({ name: 'Bob', age: 7 });
await child1.save();
await child2.save();

// 创建主文档并添加子文档引用
const Parent = mongoose.model('Parent', parentSchema);
const parent = new Parent({ children: [child1._id, child2._id] });
await parent.save();

// 填充子文档中的模型实例数组
const populatedParent = await Parent.findById(parent._id).populate('children');
console.log(populatedParent.children);