Mongoose中唯一的亲子关系数据

const mongoose = require('mongoose');

// 定义父级模型
const ParentSchema = new mongoose.Schema({
  name: String,
});

// 定义子级模型，并将child字段与Parent模型关联
const ChildSchema = new mongoose.Schema({
  name: String,
  parent: { type: mongoose.Schema.Types.ObjectId, ref: 'Parent' }, // 使用ref属性关联Parent模型
});

const ParentModel = mongoose.model('Parent', ParentSchema);
const ChildModel = mongoose.model('Child', ChildSchema);

module.exports = { ParentModel, ChildModel };

const parent = new ParentModel({ name: 'Parent' });
parent.save();

const child = new ChildModel({ name: 'Child', parent: parent._id });
child.save();