Question

这是我的post型号：

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

const PostSchema = new Schema({
  text: String,
  image: String,
  author: {
    type: Schema.Types.ObjectId,
    ref: 'user',
    required: true
  },
  university: {
    type: String,
    required: true
  },
  uniOnly: {
    type: Boolean,
    required: true
  },
  createdAt: {
    type: Number,
    required: true
  },
  expiresAt: {
    type: Number,
    required: true
  },
  voteCount: {
    type: Number,
    required: true
  },
  comments: [{
    type: Schema.Types.ObjectId,
    ref: 'comment'
  }],
  commenters: [{
    type: Schema.Types.ObjectId,
    ref: 'user'
  }],
  categories: [{
    type: String
  }]
});

PostSchema.virtual('commentCount').get(function () {
  return this.comments.length;
});

PostSchema.virtual('expired').get(function () {
  const now = new Date().getTime();

  return now <= this.expiresAt;
});

const Post = mongoose.model('post', PostSchema);

module.exports = Post;

如您所见，我试图创建几种虚拟类型：

commentCount将给出comments。
expired会标记为true或false

这是控制器：

create(req, res, next) {
    const postProps = req.body;
    const now = new Date().getTime();
    const expiresAt = now + 43200000;

    const { author, text, image, categories, university, uniOnly } = postProps;

    Post.create({
      author,
      text,
      image,
      categories,
      university,
      uniOnly,
      createdAt: now,
      voteCount: 0,
      expiresAt,
    })
      .then(post => res.send(post))
      .catch(next);
  },

现在，使用Postman我可以看到帖子本身正在创建中。但出于某种原因，我还没有找到虚拟类型的任何内容，commentCount和expired。

这是我回复的内容：

}
  "__v": 0,
  "author": "5896623ff821b14c4470cf97",
  "text": "this is ANOTHER post",
  "university": "University of Birmingham",
  "uniOnly": false,
  "createdAt": 1486306414679,
  "voteCount": 0,
  "expiresAt": 1486349614679,
  "_id": "58973c6ef24ca4828c2adae1",
  "categories": [
    "music",
    "dance"
  ],
  "commenters": [],
  "comments": []
}

谢谢

Answer 1

如果要将虚拟序列化为json对象，请尝试doc.toObject({ virtuals: true })，如http://mongoosejs.com/docs/api.html#document_Document-toObject所示。

为什么我的虚拟猫鼬类型不会出现？

1 个答案: