如何在猫鼬模式验证器中获取猫鼬会话

Question

我想验证模式中的引用，我需要验证器才能访问会话。

场景

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

需要

我想验证引用的对象是否存在，但为此，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

我根本不明白“这个”指的是什么。

编辑：添加示例


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();

并且输出：

this undefined

Answer 1

你不应该使用 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.

将其更改为常规函数声明应该可以修复它：

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

如何在猫鼬模式验证器中获取猫鼬会话

how to get mongoose session in mongoose schema validator

mongoose

mongodb

mongoose-schema