我想用一个动作删除两个对象。这两个对象都有共同的道具： gfs（file）-具有id属性 File（文字名称）-具有fileID属性，该属性从gfs（file）的id属性获取值。 这是函数，问题是删除不兼容的对象。

router.delete('/:id',auth,(req,res) => {
  gfs.remove({ _id: req.params.id,root: 'files' },(err,gridStore) => {
    if (err) {
      return res.status(404).json({ err: err });
    }
  })
  File.findOne(req.body.fileID)
    .then(file => file.remove().then(() => res.json({ success: true })))
    .catch(err => res.status(404).json({ success: false }));
});

gfs（和multer存储）在哪里：

conn.once('open',() => {
  // Init stream
  gfs = Grid(conn.db);
  gfs.collection('files');
});

// // Create storage engine
const storage = new GridFsStorage({
  db: conn,file: (req,file) => {
    return new Promise((resolve,reject) => {
      crypto.randomBytes(16,buf) => {
        if (err) {
          return reject(err);
        }
        const filename = buf.toString('hex') + path.extname(file.originalname);
        const fileInfo = {
          filename: filename,bucketName: 'files'
        };
        resolve(fileInfo);
      });
    });
  }
});
const upload = multer({ storage });

文件（后操作）：

router.post('/',upload.single('file'),res) => {
  const newFile = new File({
    fileID: req.file.id,src: 'api/files/image/' + req.file.filename,altText: 'No image',caption: req.body.caption
    // Grab the file id that was stored in the database by the storage engine as the reference to your file
  })
  newFile.save()

});

文件（模型）：

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

// Create Schema
const FileSchema = new Schema({
  fileID: {
    type: Schema.Types.ObjectId
  },src: {
    type: String,},altText: {
    type: String,caption: {
    type: String,});

module.exports = File = mongoose.model('file',FileSchema);