Multer GridFs 存储将 req.user 关联到元数据

问题描述

我可以使用 multer-gridfs-storage 将文件上传到我的 MongoDB，但我无法将文件与用户关联，我想要的是能够将从passportjs 获取的req.user 传递到文件元数据

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


// Init gfs
let gfs;

conn.once('open',() => {
gfs = Grid(conn.db,mongoose.mongo);
gfs.collection('uploads');
});

// Create storage engine
const storage = new GridFsstorage({
  url: mongoURI,file: (req,file) => {
  crypto.randomBytes(16,(err,buf) => {
  if (err) {
        return reject(err);
      }
      const filename = buf.toString('hex') + 
      path.extname(file.originalname);
      const fileInfo = {
        filename: filename,bucketName: 'uploads',Metadata: {
          user : // I want to pass here req.user 
        }
      };
      resolve(fileInfo);
    });
  });
},});
const upload = multer({ storage }); 

解决方法

你应该像这样实现：

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


// Init gfs
let gfs;

conn.once('open',() => {
gfs = Grid(conn.db,mongoose.mongo);
gfs.collection('uploads');
});

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