数据显示未定义它将如何更正

Question

这是错误:

D:\LCO bootcamp\Project_Backend\controllers\product.js:50 product.photo.data = fs.readFileSync(file.photo.path); ^

TypeError: Cannot set properties of undefined (setting 'data')

代码：

if (file.photo) {
      if (file.photo.size > 3000000) {
        return res.status(400).json({
          error: "File size too big!"
        });
    }

      
      product.photo.data = fs.readFileSync(file.photo.filepath);
      product.photo.contentType = file.photo.mimetype;
}

'

Answer 1

将product.photo.data = fs.readFileSync(file.photo.filepath)和product.photo.contentType = file.photo.mimetype移动到if(product.photo){...}里面：

if (file.photo) {
          if (file.photo.size > 3000000) {
            return res.status(400).json({
              error: "File size too big!"
            });
        }
    
          if(product.photo){
            product.photo.data = fs.readFileSync(file.photo.filepath);
            product.photo.contentType = file.photo.mimetype;
          }
          
    }