Question

我有一个关于删除多个引用的问题。我有3个架构模型 - ＆gt;事件，发布和评论。事件存储对post（一对多）的引用和对注释的post store引用（one-to-many）。

事件架构

const mongoose = require('mongoose'),
  Schema = mongoose.Schema,
  ObjectId = mongoose.Schema.Types.ObjectId;

const EventSchema = new Schema({
  organizer: { 
    type: ObjectId, 
    required: true, 
  }, 
  date: { 
    start: { 
      type: Date, 
      required: true, 
    }, 
    end: { 
      type: Date, 
      required: true, 
    }, 
  }, 
  name: {
    type: String,
    required: true,
  },
  description: {
    type: String,
    required: true,
  },
  category: {
    type: String,
    required: true,
  },
  posts: [{
    type: ObjectId,
    ref: 'Post',
  }],
});

module.exports = mongoose.model('Event', EventSchema);

发布架构

const mongoose = require('mongoose'),
  Schema = mongoose.Schema,
  ObjectId = mongoose.Schema.Types.ObjectId;

const PostSchema = new Schema({
  author: {
    type: String,
    required: true,
  },
  date: {
    type: Date,
    default: Date.now(),
    required: true,
  },
  content: {
    type: String,
    required: true,
  },
  comments: [{
    type: ObjectId,
    ref: 'Comment',
  }],
});

module.exports = mongoose.model('Post', PostSchema);

评论模式

const mongoose = require('mongoose'),
  Schema = mongoose.Schema,
  ObjectId = mongoose.Schema.Types.ObjectId;

const CommentSchema = new Schema({
  author: {
    name: {
      type: String,
      required: true,
    },
    id: {
      type: ObjectId,
      required: true,
    },
  },
  date: {
    type: Date,
    default: Date.now(),
  },
  content: {
    type: String,
    required: true,
  },
});

module.exports = mongoose.model('Comment', CommentSchema);

现在看看这种情况：我删除了一个事件，所以我需要删除帖子（简单）和相关评论（ups！）。这是我的问题：如何使用他的所有引用轻松删除事件（删除事件会自动删除帖子和相关评论到这篇文章）？我真的不知道。谢谢你的帮助！

Answer 1

0）阅读您要删除的活动

cont eventObj = Event.findOne({
  _id: myEventId,
})

1）获取与要删除的事件相关的所有帖子

const posts = eventObj.posts;

const postObjs = Post.find({
  _id: {
    $in: posts,
  },
});

2）获取与您要删除的帖子相关的所有评论

   const comments = postsObjs.reduce((tmp, x) => [
      ...tmp,
      ...x.comments,
   ], []);

3）删除所有评论

   Comments.remove({
     _id: {
       $in: comments,
     },
   });

4）删除所有帖子

   Post.remove({
     _id: {
       $in: posts,
     },
   });

5）删除活动

  Event.remove({
     _id: {
       $in: event,
     },
   });

删除多个引用

1 个答案: