如何删除具有multer gridfs存储的文件?

时间:2019-10-24 14:54:19

标签: node.js mongodb mongoose multer multer-gridfs-storage

以下代码可以正常工作以上传和检索文件:

// Mongo URI
const mongoURI = 'mongodbconnstring';

// // Create mongo connection
const conn = mongoose.createConnection(mongoURI);

// // Init gfs
let gfs;

conn.once('open', () => {
  gfs = new mongoose.mongo.GridFSBucket(conn.db, {
    bucketName: 'Uploads'
  });
});

// Create storage engine
const storage = new GridFsStorage({
  url: mongoURI,
  file: (req, file) => {
    return new Promise((resolve, reject) => {
      const filename = file.originalname; //+ Date.now();
      const fileInfo = {
        filename: filename,
        bucketName: 'Uploads'
      };
      resolve(fileInfo);
    });
  }
});
const upload = multer({ storage });

// // @route POST /upload
// // @desc Uploads file to DB
routerUpload.post('/upload', upload.single('files'), (req, res) => {
  //res.json({file: req.file})
  res.redirect('/');
});

// @route GET /files
// @desc Display all files in json
routerUpload.get('/files', (req, res) => {
  gfs.find().toArray((err, files) => {
    // Check if files
    if (!files || files.length === 0) {
      return res.status(404).json({
        err: 'No files exist'
      });
    }
    return res.json(files);
  });
});

// @route GET /files/:filename
// @desc Display single file object
routerUpload.get('/files/:filename', (req, res) => {
  const file = gfs
    .find({
      filename: req.params.filename
    })
    .toArray((err, files) => {
      if (!files || files.length === 0) {
        return res.status(404).json({
          err: 'No file exists'
        });
      }
      gfs.openDownloadStreamByName(req.params.filename).pipe(res);
    });
});

但是,当我调用下面的代码以按ID删除文件时:

// @route DELETE /files/:id
// @desc Delete file
routerUpload.post('/files/del/:id', (req, res) => {
  gfs.delete(req.params.id, (err, data) => {
    if (err) {
      return res.status(404).json({ err: err.message });
    }

    res.redirect('/');
  });
});

我在邮递员中收到此错误:

{
    "err": "FileNotFound: no file with id 5db097dae62a27455c3ab743 found"
}

有人能指出我该怎么做的方向吗?我尝试使用delete方法而不是post方法,甚至指定了文件的根目录,但是发生相同的错误。谢谢!

1 个答案:

答案 0 :(得分:0)

您尝试过

// @route DELETE /files/:id
// @desc Delete file
routerUpload.post('/files/del/:id', (req, res) => {
   gfs.remove({ _id: req.params.id, root: "uploads" }, (err, gridStore) => {
            if (err) {
                return res.status(404).json({ err });
            }
            return;

        });
});

但是我使用的是旧版Express,因此收到了

  

(节点:6024)DeprecationWarning:不建议使用collection.remove。改用deleteOne,deleteMany或bulkWrite。

  

(节点:6024)不推荐使用警告:猫鼬:findOneAndUpdate()findOneAndDelete()(未将useFindAndModify选项设置为false)

这是由于我使用的express,multer和GridFs版本

  1. 表达:^ 4.17.1
  2. multer:^ 1.4.2“
  3. multer-gridfs-storage:^ 3.3.0