上传不是功能中间件的多路路由问题

Question

这是我的multer存储区，我想用会话用户名命名文件，这就是我的问题所在如果我在外部常量上传，我将无法再访问req.session.user.username。。。

const storage = multer.diskStorage({
destination: function (req, file, cb) {
cb(null, "./uploads/usersprofile/");
},
filename: function (req, file, cb) {
cb(
null,
file.fieldname +
"_" +
`${req.session.user.username}${path.extname(file.originalname)}`
);
},
});

这是我上传文件的路径，但它上传文件，但给了我"；上传不是一个功能"；error我不确定如何使它与CCD_ 1一起工作，因此它不允许未登录的用户上传加上不显示"；上传不是一个功能"；错误

router.post(
"/uploadpicture",
multer({
storage: storage,
fileFilter: (req, file, cb) => {
if (
file.mimetype == "image/png" ||
file.mimetype == "image/jpg" ||
file.mimetype == "image/jpeg"
) {
cb(null, true);
} else {
cb(null, false);
return cb(new Error("Only .png, .jpg and .jpeg format allowed!"));
}
},
limits: { fileSize: maxSize },
}).single("avatar"),
(req, res) => {
if (req.session.user && req.session.user.username) {
upload(req, res, function (err) {
if (err instanceof multer.MulterError) {
res.send(err);
} else if (err) {
res.send(err);
}
});
} else {
res.json({ loggedIn: false });
}
}
);

Answer 1

通过创建导致"化身"；const upload = myMulter.single("avatar");

const storage = multer.diskStorage({
destination: function (req, file, cb) {
cb(null, "./uploads/usersprofile/");
},
filename: function (req, file, cb) {
cb(
null,
file.fieldname +
"_" +
`${req.session.user.username}${path.extname(file.originalname)}`
);
},
});
const myMulter = multer({
storage: storage,
fileFilter: (req, file, cb) => {
if (
file.mimetype == "image/png" ||
file.mimetype == "image/jpg" ||
file.mimetype == "image/jpeg"
) {
cb(null, true);
} else {
return cb(new Error("Only .png, .jpg and .jpeg format allowed!"));
}
},
limits: { fileSize: maxSize },
});
const upload = myMulter.single("avatar");
router.post("/uploadpicture", (req, res) => {
if (req.session.user && req.session.user.username) {
upload(req, res, function (err) {
if (err instanceof multer.MulterError) {
res.send(err);
} else if (err) {
res.send(err);
}
});
} else {
res.json({ loggedIn: false });
}
});