node.js - Mongodb 仅当匹配的组合不返回 true 时才查找和 insertMany

Question

我必须在 action 集合中插入一个批处理，如下所示:

[

  {

    "userId": "57ee65fef5a0c032877725db",

    "postId": "57f63ce196b01748e4712ed3",

    "type": "like"

  },

  {

    "userId": "57ee65fef5a0c032877725db",

    "postId": "57f7335223a76c0f780a44c5",

    "type": "dismiss"

  },

  {

    "userId": "57ee65fef5a0c032877725db",

    "postId": "57f7335223a76c0f780a44c5",

    "type": "dislike"

  }

]

操作集合的架构如下所示:

const ActionSchema = new mongoose.Schema({
    userId: mongoose.Schema.Types.ObjectId,
    postId: mongoose.Schema.Types.ObjectId,
    type: String
}, {
    timestamps: true
});

但在插入之前，我想确保该数组中的特定“userId”和“postId”在 db 的 action 集合 中没有匹配的组合。由于用户只能针对其他用户发布的特定帖子执行单个操作。

Answer 1

'use strict';
var mongoose = require('mongoose');

var accountTypeSchema = new mongoose.Schema({
    name:{type:String, index: { unique: true }},
    created: {type: Date, default: Date.now()},
    deleted: {type: Number, default: 0}
});

module.exports = mongoose.model('AccountType', accountTypeSchema);