Express, mongoDB, mon goose и multer. У меня есть одна форма (примечание: без изображения), которую я могу загрузить в свою базу данных, и сервер express также хорошо работает при загрузке.
Но у меня есть одна форма с изображением, поэтому я с использованием multer.
При загрузке я получаю две следующие ошибки:
500 Внутренняя ошибка сервера
Ошибка преобразования в строку для значения "{product_name: 'sample product', sub_category: 'Sample'}" по пути "product_name" для модели "product" [0] {[0] product_image: {product_image: {}}, [0] sub_category: {sub_category: 'Sample', product_name: 'sample product'}, [0] product_name: {product_name: 'sample product', sub_category: 'Sample'}, [0] product_specs: [{спецификация: 'Density', specvalue: '500' }] [0]} ``
Всего два известных прототипа каждого поля ввода, я делюсь снимком экрана console.log, который я использовал в файле загрузки продукта в строке № 65- 
I am sharing my code for following-
1 Mongoose Schema file Product.js
2 React form -Productupload file,
3 route file for route(/product),
4 server.js,
5 db.js
I want to know:
Is there any error due to prototype not matching of Schema and my req.body with each other?
Is My Multer code ok?, I have also commented Grid-fs code because previously I was using it, but as that was giving me the error, then I changed my code. shall I switch back to grid code?
Is there anything else needed to upload image to my backend.
Thank you for bearing till now, Hope someone will help me, Ready to share code Sandbox If needed.
Please help someone.
Mongoose Schema
```
const mongoose = require("mongoose");
const ProductSchema = new mongoose.Schema({
sub_category: {
type: String,
required: true,
},
product_image: {
type: String,
required: true,
},
product_name: {
type: String,
required: true,
},
product_specs: {
type: [],
required: true,
},
});
module.exports = Product = mongoose.model("product", ProductSchema);
```
React Form Product Upload File
```
import React, { useState } from "react";
import FormInput from "../Forminput/forminput";
import CustomButton from "../Custombutton/custombutton";
import axios from "axios";
const ProductUpload = () => {
const [sub_category, setSub_category] = useState({ sub_category: "" });
const [product_name, setProduct_name] = useState({ product_name: "" });
const [product_image, setProduct_image] = useState("");
const [product_specs, setProduct_specs] = useState([
{
specification: "",
specvalue: "",
},
]);
const imageSelectedHandler = (event) => {
setProduct_image({ product_image: event.target.files[0] });
};
const handleChange1 = (e) => {
const { name, value } = e.target;
setSub_category({ ...sub_category, [name]: value });
setProduct_name({ ...product_name, [name]: value });
};
const handleChange2 = (e, i) => {
const { name, value } = e.target;
const p_specs = [...product_specs];
p_specs[i][name] = value;
setProduct_specs(p_specs); //This is 100% right.
};
//to add extra input field
const addClick = () => {
const p_specs = [...product_specs];
p_specs.push({ specification: "", specvalue: "" });
setProduct_specs(p_specs);
};
//to remove extra input field
const removeClick = (i) => {
const p_specs = [...product_specs];
p_specs.splice(i, 1);
setProduct_specs(p_specs);
};
const handleSubmit = async (event) => {
event.preventDefault();
const newProduct = {
product_image,
sub_category,
product_name,
product_specs,
};
console.log(newProduct); //getting this in console.
try {
const config = {
headers: {
"Content-Type": "application/json",
},
};
const body = JSON.stringify(newProduct);
const res = await axios.post("/api/product", body, config);
console.log(res.data);
} catch (error) {
console.error(error.response.data);
}
};
const createUI = () => {
return product_specs.map((item, i) => {
return (
handleChange2 (e, i)} value = {item.specification} label = "спецификация" требуется customwidth = "300px"> handleChange2 (e, i)} value = {item.specvalue} label = "значения спецификации, разделенные quomas" обязательно> removeClick (i)} type = "button" value = "remove" style = {{margin: "12px"}}> Удалить ); }); }; возвращение ( Добавить новый товар в базу # {console.log (product_image)} {console.log (product_name)} {console.log (product_specs)} {createUI ()} Добавить поля Загрузить товар ); }; экспорт по умолчанию ProductUpload; ``
Маршрут продукта
```
const express = require("express");
const router = express.Router();
const Product = require("../../models/Product");
const { check, validationResult } = require("express-validator");
//const GridFsStorage = require("multer-gridfs-storage");
const multer = require("multer");
const path = require("path");
const Storage = multer.diskStorage({
destination: "./client/public/uploads/",
filename: (req, file, cb) => {
cb(
null,
file.filename + "_" + Date.now() + path.extname(file.originalname)
); //fieldname will automatically get input filed name value in our case product_omage
},
});
//middleware
const upload = multer({ storage: Storage }).single("product_image");
/*const storage = new GridFsStorage({
db: connectDB(),
});
const upload = multer({ storage });
module.exports = upload;*/
// @route GET api/Product
router.get("/", (req, res) => res.send("Product route"));
// @route POST api/Product
router.post(
"/",
[
check("sub_category", "subcategory is required").not().isEmpty(),
check("product_name", "product name is required").not().isEmpty(),
],
upload,
async (req, res) => {
const errors = validationResult(req);
console.log("req");
if (!errors.isEmpty()) {
return res.status(400).json({ errors: errors.array() });
}
const {
sub_category,
product_name,
product_image,
product_specs,
} = req.body;
console.log(req.body);
console.log(req.body);
try {
//See if product exists
let product = await Product.findOne({ product_name }); // Product.findOne() is mongo db query
if (product) {
return res
.status(400)
.json({ errors: [{ msg: "Product already exists" }] });
}
//New product instance will be created and once user.save() command is given user will be created in mongodb database.
product = new Product({
sub_category,
product_name,
product_image,
product_specs,
});
await product.save();
} catch (err) {
console.error(err.message);
res.status(500).send("Server error");
}
}
);
module.exports = router;
```
файл db
```
const mongoose = require("mongoose");
const config = require("config");
const db = config.get("mongoURI");
const connectDB = async () => {
try {
await mongoose.connect(db, {
useUnifiedTopology: true,
useNewUrlParser: true,
useCreateIndex: true,
useFindAndModify: false,
});
console.log("MongoDB connected...");
} catch (err) {
console.error(err.message);
process.exit(1);
}
};
module.exports = connectDB;
```