【问题标题】：how to cancel mongoose query 'save' 'pre' hook如何取消猫鼬查询\'save\'\'pre\'钩子
【发布时间】：2022-11-12 00:39:31
【问题描述】：

如果使用 bcrypt 对密码进行哈希处理时出错，我想取消插入

userSchema.pre('save', async function (next) {
    try {
        const hashedPassWord = await bcrypt.hash(this.password, 10)
        this.password = haschedpassword
    } catch (err) {
        // samething like rollback in sql database
    }

    next()

})

【问题讨论】：

标签： javascript node.js mongodb mongoose

【解决方案1】：

Erros in pre hooks

如果任何 pre hook 出错，mongoose 将不会执行后续的中间件或 hooked 函数。 Mongoose 会将错误传递给回调和/或拒绝返回的承诺。中间件报错有几种方式：

schema.pre('save', function(next) {
  const err = new Error('something went wrong');
  // If you call `next()` with an argument, that argument is assumed to be
  // an error.
  next(err);
});

schema.pre('save', function() {
  // You can also return a promise that rejects
  return new Promise((resolve, reject) => {
    reject(new Error('something went wrong'));
  });
});

schema.pre('save', function() {
  // You can also throw a synchronous error
  throw new Error('something went wrong');
});

schema.pre('save', async function() {
  await Promise.resolve();
  // You can also throw an error in an `async` function
  throw new Error('something went wrong');
});

// later...

// Changes will not be persisted to MongoDB because a pre hook errored out
myDoc.save(function(err) {
  console.log(err.message); // something went wrong
});

TL;博士

只需将任何内容传递给next 或抛出错误

在您的情况下，删除 try..catch 就可以了

【讨论】：