javascript - 删除项目mongodb和 Node 异步

Question

我在从上传 [] 对象中删除项目时遇到问题。
下面代表一个用户，keys[] 代表与文件上传关联的键，uploads[] 是该键下的文件。这些都是嵌入在用户模型中的文档。我现在意识到使用引用文献会更好，但我现在坚持这样做。这是我现在用来查找上传项目的函数，

______________这是我当前的职能_____________________

老实说，我正在使用异步，但我不太理解它。是否有不同的异步函数或方法可以在 mongo 中查找这些项目，效果更好？ 当前问题:1)即使找到正确的项目，这也会继续循环直到结束。 2)如何删除上传的项目？

exports.getApiDelete = function (req, res, next) {
  User.findById(req.user.id, function(err, user) {
    if (err) return next(err);
    console.log("User ID found: "+ user._id);
    //loop though user keys
    async.forEach(user.profile.keys, function(item, callback) {
    //verify key exists
      if(item.key==req.params.scriptkey){console.log("KEY FOUND")};
      async.forEach(item.uploads, function(item, callback) {
        //verify file exits
        console.log(req.params.file_id);
        if(item._id == req.params.file_id){

        // DELETE FUNCTION HERE?

        };
      }, function(err){
        console.log('Error during async lookup: '+err);
        });

  }, function(err){
    console.log('Error during async lookup: '+err);
    });
  });
};

______________________________这是我的用户模型_____________________

{
"__v": 19,
"_id": {
    "$oid": "53c812c4e75ab0b013f3c6bc"
},
"email": "fake@mailinator.com",
"password": "fake",
"profile": {
    "gender": "",
    "keys": [
        {
            "_id": {
                "$oid": "53c8130ae75ab0b013f3c6bd"
            },
            "status": false,
            "iteration": 0,
            "created": {
                "$date": "2014-07-17T18:16:42.568Z"
            },
            "uploads": [],
            "description": "This is being run from my Windows Desktop.",
            "location": "Front Row",
            "name": "fake_Desktop",
            "key": "80f94c80-0dde-11e4-ae14-43922f7b8f23"
        },
        {
            "_id": {
                "$oid": "53c814ade75ab0b013f3c6be"
            },
            "created": {
                "$date": "2014-07-17T18:23:41.777Z"
            },
            "description": "Windows VM test.",
            "iteration": 12,
            "key": "7ad78410-0ddf-11e4-ae14-43922f7b8f23",
            "location": "Back Right",
            "name": "fake2_Desktop",
            "status": false,
            "uploads": [
                {
                    "_id": {
                        "$oid": "53c81517e75ab0b013f3c6bf"
                    },
                    "ip": "10.0.1.156",
                    "fname": "hklm_1.txt",
                    "iteration": 1,
                    "created": {
                        "$date": "2014-07-17T18:25:27.241Z"
                    },
                    "filepath": "script_uploads/7ad78410-0ddf-11e4-ae14-43922f7b8f23_1_hklm_1.txt"
                },
                {
                    "_id": {
                        "$oid": "53c8151ae75ab0b013f3c6c0"
                    },
                    "ip": "10.0.1.156",
                    "fname": "hklm_1.txt",
                    "iteration": 2,
                    "created": {
                        "$date": "2014-07-17T18:25:30.634Z"
                    },
                    "filepath": "script_uploads/7ad78410-0ddf-11e4-ae14-43922f7b8f23_2_hklm_1.txt"
                }
            ]
         }
}

Answer 1

您只想从数组中删除吗？如果是，请使用

  for(var i =0, j = item.uploads.length; i < j; i++) {
    //verify file exits
    console.log(req.params.file_id);
    if(item.uploads[i]._id == req.params.file_id){

        item.uploads.slice(i, 1);

    };

最后使用: user.save(function(err){}); 如果您想从文件系统中删除任何内容，请使用:

fs = require('fs');
fs.unlink( FILE PATH , function(err) {
    console.log(err);
});

此外，您实际上并不需要 forEach 的异步版本，因为 User.findById 本身是异步的，并且整个过程在后台进行。

This will continue looping through until the end even after it finds the correct items.

async.forEach 没有“中断”。因此，如果您不想执行不需要的过程，请像我一样使用 for 并附加一个断点。