Question

我试图删除猫鼬数组中的多个对象。我的锻炼模型如下：

{
  _id: 5e04068491a2d433007026cd,
  exercises: [
     { _id: 5e0401b9dda7ea28a70e99ed, reps: '1', sets: '3' },
     { _id: 5e0401cadda7ea28a70e99ee, reps: '1', sets: '3' },
     { _id: 5e0401dbdda7ea28a70e99ef, reps: '1', sets: '3' }
   ]
}

我有一个ID数组，名为DeletedExercises，这些是我要从练习列表中删除的对象的ID。我试图遍历DeletedExercise，并删除所有与DeletedExercise项目的ID相匹配的练习。

router.put("/:workoutId", (req, res)=>{
  deletedOnes = req.body.exerciseId
    deletedExercises = []
    if(typeof deletedOnes === 'object'){
        deletedOnes.forEach(item => {
            deletedExercises.push(item)
        })
    } else {
        deletedExercises.push(deletedOnes)
    }
    deletedExercises.forEach(item => {
      Workout.findByIdAndUpdate( req.params.workoutId, 
        { $pull: { exercises: { _id: item} } } )
});

Answer 1

您可以使用$in内的$pull运算符简单地删除练习，如下所示：

router.put("/:workoutId", (req, res) => {
  console.log(req.body.exerciseId); //[ '5e05c5306e964f0a549469b8', '5e05c5306e964f0a549469b6' ]

  Workout.findByIdAndUpdate(
    req.params.workoutId,
    {
      $pull: {
        exercises: {
          _id: {$in: req.body.exerciseId}
        }
      }
    },
    { new: true }
  )
    .then(doc => {
      res.send(doc);
    })
    .catch(err => {
      console.log(err);
      res.status(500).send("Error");
    });
});

假设我们有3种锻炼方式进行锻炼：

{
    "_id": "5e05c5306e964f0a549469b5",
    "exercises": [
        {
            "_id": "5e05c5306e964f0a549469b8",
            "reps": 8,
            "sets": 4
        },
        {
            "_id": "5e05c5306e964f0a549469b7",
            "reps": 10,
            "sets": 3
        },
        {
            "_id": "5e05c5306e964f0a549469b6",
            "reps": 12,
            "sets": 2
        }
    ],
}

如果我们要删除此5e05c5306e964f0a549469b8锻炼的锻炼5e05c5306e964f0a549469b6和5e05c5306e964f0a549469b5，则可以使用该正文发送PUT请求：（URL必须以类似{{1的结尾}}）

http://.../5e05c5306e964f0a549469b5

响应将是：

{
    "exerciseId": [
        "5e05c5306e964f0a549469b8",
        "5e05c5306e964f0a549469b6"
    ]
}

Answer 2

很难说出您不是在说什么错误，但是从我的猜测来看，您是在将ObjectId与String进行比较，请尝试替换此行：

{ $pull: { exercises: { _id: item} } } )

与此：

{ $pull: { exercises: { _id: new ObjectId(item)} } } )

**编辑**

您可能还需要将要搜索的主要ID转换为ObjectId：

Workout.findByIdAndUpdate( new ObjectId(req.params.workoutId), 
    { $pull: { exercises: { _id: new ObjectId(item)} } } )

如何从猫鼬模型中的数组中删除对象

2 个答案: