如何在猫鼬模式验证器中获取猫鼬会话 [英] how to get mongoose session in mongoose schema validator

问题描述

我想验证架构中的引用，我需要验证器才能访问会话.

场景

开始猫鼬会话开始猫鼬事务向表中插入条目将条目插入另一个表，并引用第一个条目

需要

我想验证引用的对象是否存在，但要做到这一点，我需要访问验证器内部的会话.

这个 github 问题看起来很相似，但是 this.$session() 对我不起作用https://github.com/Automattic/mongoose/issues/7652

我只是不明白什么是这个"应该是指.

添加示例

<预><代码>从猫鼬"进口猫鼬；异步函数运行(){//用户数据根模式const userSchema = new mongoose.Schema(//定义数据模式{帐户ID: {类型:mongoose.Schema.Types.ObjectId，要求:真实，验证:异步(val)=>{控制台日志(这个"，这个)；}}});const User = mongoose.model("User", userSchema);const url = null;//秘密常量选项 = {};等待 mongoose.connect(url, options);const user = new User({ accountId: "605c662ba2cde486ecd36a4a" });等待 user.save();}跑步();

和输出:

这个未定义

解决方案

你不应该使用 javascript 箭头函数

<块引用>

箭头函数表达式是传统函数表达式的紧凑替代品，但有局限性，不能在所有情况下使用.

不同之处限制:

• 没有自己的 this 或 super 绑定，不应用作方法.

将其更改为常规函数声明应该可以修复它:

 验证:异步函数 (val){控制台日志(这个"，这个)；}

I want to validate a reference in a schema, and I need the validator to be able to access the session.

Scenario

start mongoose session
start mongoose transaction
insert entry to a table
insert entry to another table, with a reference to the first entry

Desired

I want to validate the referenced object exists, but to do that, I need access to the session, inside the validator.

this github issue seems similar, but this.$session() isn't working for me https://github.com/Automattic/mongoose/issues/7652

I simply don't understand what "this" is supposed to be referring to.

EDIT: adding example

import mongoose from "mongoose";

async function run() {
  // User data root schema
  const userSchema = new mongoose.Schema(
    // Define the data schema
    {
      accountId: {
        type: mongoose.Schema.Types.ObjectId,
        required: true,
        validate: async (val) => {
          console.log("this", this);
        }
      }
    }
  );

  const User = mongoose.model("User", userSchema);

  const url = null; // secret
  const options = {};
  await mongoose.connect(url, options);

  const user = new User({ accountId: "605c662ba2cde486ecd36a4a" });
  await user.save();
}

run();

And the output:

this undefined

解决方案

You shouldn't use a javascript arrow function

An arrow function expression is a compact alternative to a traditional function expression, but is limited and can't be used in all situations.

Differences & Limitations:

• Does not have its own bindings to this or super, and should not be used as methods.

Changing it to regular function declaration should fix it:

    validate: async function (val){
      console.log("this", this);
    }

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