等待循环 NodeJS 中的每个元素执行 findOneAndDelete 方法

问题描述

我想在 mongoose 中作为 post findOneAndDelete 中间件执行模式统计信息。当我循环时，我的代码正在调用模式，但它只计算一个文档删除。

我已经搜索了很多问题和答案，但还没有工作，

exports.deleteallAssociatedAns = catchAsync(async (req,res,next) => {
  const allAssocAnswers = await Answer.find({
    answerOfQuesId: req.params.quesId,});
  if (!allAssocAnswers || allAssocAnswers.length === 0) {
    next();
  }

  await Promise.all(
    Array.from(allAssocAnswers).map(async (el) => {
      const deletedAnswer = await Answer.findOneAndDelete({
        _id: el._id,});
      if (!deletedAnswer) {
        return next(new AppError('Something Went Wrong,Try Again!',404));
      }
    })
  );

 //Next Middleware
});

FindOneAndDelete 然后调用一个模式统计，

answerSchema.statics.calcUserAnswerStatistics = async function (
  userId,status
) {
  const stats = await this.aggregate([
    {
      $match: { answerAuthor: userId },},{
      $group: {
        _id: '$answerAuthor',nAnswers: { $sum: 1 },]);
  if (stats.length > 0) {
    const user = await User.findById(userId);
    const userPoints = user.earnedPoints;
    const qnaCount = user.totalQnaCount;
    console.log(userPoints); **//This is consoling 4 Times If there is 4 Result but the below calculation is just calculating one time**

    if (status === 'new') {
      user.earnedPoints = userPoints + 5;
      user.totalQnaCount = qnaCount + 1;
      user.givenAnswersCount = stats[0].nAnswers;
    } else {
      user.earnedPoints = userPoints - 5; **//Just Decrease Ones**
      user.totalQnaCount = qnaCount - 1; **//Just Decrease Ones**
      user.givenAnswersCount = stats[0].nAnswers;
    }

    await user.save({ validateBeforeSave: false });
  } else {
    await User.findByIdAndUpdate(userId,{
      givenAnswersCount: 0,});
  }
};

answerSchema.post(/^findOneAndDe/,async function () {
  const ansOfQues = await Question.findById(this.r.answerOfQuesId);
  ansOfQues.answerCount -= 1; **//If there is Four Time Calls Count Should Decrease 4 in total but problem is it just decreasing one**
  await ansOfQues.save({ validateBeforeSave: false });

  await this.r.constructor.calcUserAnswerStatistics(
    this.r.answerAuthor,'deleted'
  ); **//This method is called 4 times but calculate only ones**
});

解决方法

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