Question

我正在构建MEAN Shop应用程序，试图将产品图像存储在mongodb中，但是会出现一些错误

typeError: cannot read the property 'productimage' of undefined

这是添加产品的路线功能

function addProduct(req, res, next){
    var newProduct = new Product({
        productName: req.body.productname,
        productCategory: req.body.productcategory,
        productDescription: req.body.productdescription,
        productPrice: req.body.productprice
        });
    
    newProduct.productImage.data = fs.readFileSync(req.file.productimage);
    newProduct.productImage.contentType = 'jpg';
    
     newProduct.save(function(err){
            if(err){ 
                console.log("error saving product");
                res.status(400).json({ 
                    success: false, 
                    message:'Error processing request '+ err});
        }
        else{
            console.log("product inserted");
            res.status(201).json({
                success: true,
		message: 'Product added successfully.'
        });
    }
    });
}
module.exports = {addProduct);

这是产品型号

const mongoose = require('mongoose');

const Schema = mongoose.Schema;

const productSchema = new Schema({
  productname : { type: String },
  productCategory: { type: String },
  productDescription: { type: String },
  productImage: { data: Buffer, contentType: String },
  productPrice: { type: Number }
});

module.exports = mongoose.model('product', productSchema, 'products');

这是html文件

<form class="form-style-9" 
       [formGroup]="productForm"
      (ngSubmit)="addProduct(productForm.value)"
      enctype="multipart/form-data"
      >
    <ul>
        <li><span>Product Name</span>
            <input type="text" name="productname" class="field-style field-full align-none" placeholder="Name" formControlName="productname" />
        </li>
        <span>Product Category</span><br>
        <select formControlName="productcategory">
          <option value="Clothing">Clothing</option>
          <option value="Electronics">Electronics</option>
          <option value="Books">Books</option>
          <option value="Toys">Toys</option>
        </select>
        <li><span>Product Description</span>
            <textarea name="productdescription" class="field-style" placeholder="Product Description" formControlName="productdescription"></textarea>
        </li>
        <li><span>Product Image</span>
            <input type="file" name="productimage" class="field-style field-full align-none" placeholder="Image" formControlName="productimage"/>
        </li>
        <li><span>Product Price</span>
            <input type="number" name="productprice" class="field-style field-full align-none" placeholder="Product Price" formControlName="productprice" />
        </li>
        <li>
        <input type="submit" value="Add Product" />
        </li>
    </ul>
</form>

这是组件文件

export class ProductComponent implements OnInit {

  constructor(private fb: FormBuilder, 
    private router: Router,
    private productService: ProductService,
    private toastr: ToastrService) { }
  
  ngOnInit() {
  }
  
  productName = new FormControl("");
  productCategory = new FormControl("");
  productDescription = new FormControl("");
  productImage = new FormControl("");
  productPrice = new FormControl("");
  
  
  productForm: FormGroup = this.fb.group({
    'productname': this.productName,
    'productcategory': this.productCategory,
    'productdescription': this.productDescription,
    'productimage': this.productImage,
    'productprice': this.productPrice,
  });
  
  addProduct(formdata:any) {
      this.productService.addProduct(this.productForm.value)
      .subscribe(data => {
          if (data.success === false) {
            this.toastr.error(data.message);
          } else {
            this.toastr.success(data.message);
            this.router.navigate([' ']);
          }
          this.productForm.reset();
      });
    }
  
}

我尝试使用 multer ，但是我不认为它可以正常工作，或者可能是我在编写错误的代码。请纠正我我在做什么错。

我创建了另一个文件夹来存储图像server/public/images，该文件夹包含路径和模型server/models/和server/routes/。

这是服务器文件。

var multer = require('multer');

var app = express();

var api = require('./server/routes/api');
var image = multer({ dest:'./server/public/' });

app.post('/product', image.single('images'), api.addProduct);

我在这里做什么错了？

Answer 1

我认为您的multer配置有问题。您是否也可以共享您的需求和混合中间件。

我还在下面提供了一个示例配置，用于配置multer中间件。

const multer = require('multer')

var storage = multer.diskStorage({
  destination: (req, file, cb) => {
    cb(null, './path/to/file')
  },
  filename: (req, file, cb) => {
    cb(null, "PDFS-"+file.originalname.substring(0, file.originalname.lastIndexOf('.')) + '-' +   Date.now()+(path.extname(file.originalname)).toLowerCase())
  }
});
var upload = multer({
  storage: storage,
  fileFilter: function (req, file, callback) {
    var ext = (path.extname(file.originalname)).toLowerCase();
    if(ext !== '.pdf') {
        return callback(new Error('Only pdf format files are allowed!'))
    }
    callback(null, true)
  },
  limits:{
      fileSize: 1024*1024
  }
});

app.post('/upload', function(req, res, next){
    upload.single('productimage')(req, res, function (err) {
        if (err) {
          console.log("upload err"+err);
          res.render('upload');
          return;
        }
        else{
        if (req.file===undefined) {
        console.log("empty");
        res.render('upload');
        } 
        else{
          console.log("done");
          res.render('upload');
        }
       }
      });
    });

均值堆栈：如何使用nodejs expressjs和angular 6在mongodb中存储图像？

1 个答案: