Question

连接到mongodb时，我收到警告

“ DeprecationWarning：当前URL字符串解析器已被弃用，并且将在将来的版本中删除。要使用新的解析器，请传递选项{ useNewUrlParser：true}到MongoClient.connect。”

提交表单时-我得到了

必须打开数据库连接才能存储文件在GridFSStorage._handleFile（C：\ Users \ charan puli \ Desktop \ upload \ node_modules \ multer-gridfs-storage \ lib \ gridfs.js：341：17）在C：\ Users \ charan puli \ Desktop \ upload \ node_modules \ multer \ lib \ make-middleware.js：144：17 在allowAll（C：\ Users \ charan puli \ Desktop \ upload \ node_modules \ multer \ index.js：8：3）在wrappedFileFilter（C：\ Users \ charan puli \ Desktop \ upload \ node_modules \ multer \ index.js：44：7）在Busboy。（C：\ Users \ charan puli \ Desktop \ upload \ node_modules \ multer \ lib \ make-middleware.js：114：7）在Busboy.emit（events.js：182：13）

//////////////////app.js///////////////////////

//middle wares

app.use(bodyparser.json())

app.use(methodOverride('_method'))


app.set("view engine","ejs")

//connection

var mongoURI='mongodb+srv://user:password@clusterpuli-xs9yc.mongodb.net/test?retryWrites=true'


mongoose.connect(mongoURI,{useNewUrlParser:true})
        .then(()=>{console.log('connected successfully');
        })
        .catch(err=>{console.log(err);
        })

var conn=mongoose.connection
var gfs
conn.once('open',() =>{
gfs = Grid(conn.db, mongoose.mongo);

  gfs.collection('questions')
})
//create storage object

var storage = new GridFsStorage({
    url: mongoURI,
    file: (req, file) => {
      return new Promise((resolve, reject) => {
        crypto.randomBytes(16, (err, buf) => {
          if (err) {
            return reject(err);
          }
          const filename =buf.toString('hex')+path.extname(file.originalname);
          const fileInfo = {
            filename: filename,
            bucketName: 'questions'
          };
          resolve(fileInfo);
        });
      });
    }
  });
  const upload = multer({ storage });
//@route /upload POST

app.post('/upload',upload.single('file'),(req,res)=>{
    res.json({'file':req.file})
})


 var port= 3000
app.get("/",(req,res)=>{
    res.render('index')
})

app.listen(port,()=>{
    console.log(`app is running at ${port}`);

})


////////////////////////////////////

预期-json文件对象，已成功连接

实际-数据库连接必须打开

Answer 1

//连接

var mongoURI ='mongodb + srv：// charanpuli：Charan @ 1999 @ clusterpuli-xs9yc.mongodb.net / test？retryWrites = true'

var conn = mongoose.connection

MongoClient.connect（db，{useNewUrlParser：true}）

    .then(()=>{console.log('connected successfully');
    })
    .catch(err=>{console.log(err);
    })

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

gfs.collection（'questions'） }）

Answer 2

这应该对您有用，我已经对其进行了测试：

//connection

const mongoURI = 'mongodb+srv://user:password@clusterpuli-xs9yc.mongodb.net/test?retryWrites=true';

const promise = mongoose.connect(mongoURI, { useNewUrlParser: true });

const conn = mongoose.connection;
let gfs;

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

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

有关更多信息，请参见此处的参考资料： Multer's GridFS storage engine

它与Node.js MongoDB驱动程序API的新mongo客户端的新url解析器有关。请参阅此参考：MongoClient

我遇到了同样的问题，这就是为什么我最终回答了你的问题。

提交表单时出现错误

2 个答案: