将错误消息从 mongoose 验证转换为用户友好的消息

Question

您好，我是初学者，正在尝试学习节点我正在尝试验证用户在注册页面中输入的数据这是我的猫鼬模式

const schema = mongoose.Schema({     

    fname:{type:String,
        required:[true,"enter a first name"]}, 
    lname:{type:String,
        required:[true,"enter a last name "]},
    email:{type:String,
        required:[true,"email is required"],
        unique:true,
        trim:true,
        lowercase:true,
    validate(value){
        if(!validator.isEmail(value)){
            throw new Error("Email is invalid");
        }

    }
    }, 
    pass:{type:String,required:[true,"please enter a passkey"],minlength:[8,"enter atleast 8 characters"]} 

});

如您所见，我正在尝试验证某些字段并检查错误

usersave.save((err,doc)=>{
    if(err){
        console.log(err);
        res.render("register",{err:err}
    }
    else{console.log(doc);res.send("success")}
});

如果用户在注册表中输入了错误的数据，我会在我的控制台中收到以下错误消息：-

Error: users validation failed: fname: enter a first name, lname: enter a last name , pass: please enter a passkey, email: Error, expected `email` to be unique. Value: `ar@gmail.com`
    at ValidationError.inspect (D:\.UC\eb Development\react-practice\authentication\node_modules\mongoose\lib\error\validation.js:47:26)
    at formatValue (internal/util/inspect.js:718:31)
    at inspect (internal/util/inspect.js:287:10)
    at formatWithOptions (internal/util/inspect.js:1910:40)
    at Object.Console.<computed> (internal/console/constructor.js:299:10)
    at Object.log (internal/console/constructor.js:309:61)
    at D:\.UC\eb Development\react-practice\authentication\index.js:75:21
    at D:\.UC\eb Development\react-practice\authentication\node_modules\mongoose\lib\model.js:4824:16
    at D:\.UC\eb Development\react-practice\authentication\node_modules\mongoose\lib\helpers\promiseOrCallback.js:16:11
    at D:\.UC\eb Development\react-practice\authentication\node_modules\mongoose\lib\model.js:4847:21
    at D:\.UC\eb Development\react-practice\authentication\node_modules\mongoose\lib\model.js:494:16
    at D:\.UC\eb Development\react-practice\authentication\node_modules\kareem\index.js:246:48
    at next (D:\.UC\eb Development\react-practice\authentication\node_modules\kareem\index.js:167:27)
    at next (D:\.UC\eb Development\react-practice\authentication\node_modules\kareem\index.js:169:9)
    at Kareem.execPost (D:\.UC\eb Development\react-practice\authentication\node_modules\kareem\index.js:217:3)
    at _handleWrapError (D:\.UC\eb Development\react-practice\authentication\node_modules\kareem\index.js:245:21) {
  errors: {
    fname: ValidatorError: enter a first name
        at validate (D:\.UC\eb Development\react-practice\authentication\node_modules\mongoose\lib\schematype.js:1217:13)
        at D:\.UC\eb Development\react-practice\authentication\node_modules\mongoose\lib\schematype.js:1200:7
        at Array.forEach (<anonymous>)
        at SchemaString.SchemaType.doValidate (D:\.UC\eb Development\react-practice\authentication\node_modules\mongoose\lib\schematype.js:1145:14)
        at D:\.UC\eb Development\react-practice\authentication\node_modules\mongoose\lib\document.js:2392:18
        at processTicksAndRejections (internal/process/task_queues.js:79:11) {
      properties: [Object],
      kind: 'required',
      path: 'fname',
      value: '',
      reason: undefined,
      [Symbol(mongoose:validatorError)]: true
    },
    lname: ValidatorError: enter a last name
        at validate (D:\.UC\eb Development\react-practice\authentication\node_modules\mongoose\lib\schematype.js:1217:13)
        at D:\.UC\eb Development\react-practice\authentication\node_modules\mongoose\lib\schematype.js:1200:7
        at Array.forEach (<anonymous>)
        at SchemaString.SchemaType.doValidate (D:\.UC\eb Development\react-practice\authentication\node_modules\mongoose\lib\schematype.js:1145:14)
        at D:\.UC\eb Development\react-practice\authentication\node_modules\mongoose\lib\document.js:2392:18
        at processTicksAndRejections (internal/process/task_queues.js:79:11) {
      properties: [Object],
      kind: 'required',
      path: 'lname',
      value: '',
      reason: undefined,
      [Symbol(mongoose:validatorError)]: true
    },
    pass: ValidatorError: please enter a passkey
        at validate (D:\.UC\eb Development\react-practice\authentication\node_modules\mongoose\lib\schematype.js:1217:13)
        at D:\.UC\eb Development\react-practice\authentication\node_modules\mongoose\lib\schematype.js:1200:7
        at Array.forEach (<anonymous>)
        at SchemaString.SchemaType.doValidate (D:\.UC\eb Development\react-practice\authentication\node_modules\mongoose\lib\schematype.js:1145:14)
        at D:\.UC\eb Development\react-practice\authentication\node_modules\mongoose\lib\document.js:2392:18
        at processTicksAndRejections (internal/process/task_queues.js:79:11) {
      properties: [Object],
      kind: 'required',
      path: 'pass',
      value: '',
      reason: undefined,
      [Symbol(mongoose:validatorError)]: true
    },
    email: ValidatorError: Error, expected `email` to be unique. Value: `ar@gmail.com`
        at validate (D:\.UC\eb Development\react-practice\authentication\node_modules\mongoose\lib\schematype.js:1217:13)
        at D:\.UC\eb Development\react-practice\authentication\node_modules\mongoose\lib\schematype.js:1192:24
        at processTicksAndRejections (internal/process/task_queues.js:97:5) {
      properties: [Object],
      kind: 'unique',
      path: 'email',
      value: 'ar@gmail.com',
      reason: undefined,
      [Symbol(mongoose:validatorError)]: true
    }
  },
  _message: 'users validation failed'
}

我希望能够在注册页面中通知用户他们做错了什么我收到错误消息并将错误对象传递到注册页面以重新呈现这次显示错误

当我将错误对象传递给 register.ejs

时，错误对象包含以下信息

ValidationError: fname: enter a first name, lname: enter a last name , pass: please enter a passkey, email: Error, expected `email` to be unique. Value: `ar@gmail.com`

我想在注册页面中只显示错误消息我如何根据以上信息做到这一点？或者有没有其他方法可以在前端显示错误？

Answer 1

一种方法是通过 npm express-validator 你可以阅读它 here

然后将其包含在您的路由器文件中，然后通过路由器中间件进行验证像这样：

const { check, validationResult } = require('express-validator');

router.post(
  '/',
  [
    //account details validation
    check('fname', 'Enter a First Name')
      .not()
      .isEmpty(),
    check('lname', 'Enter a Last name')
      .not()
      .isEmpty()
  check('email', 'type is required')
      .not()
      .isEmpty(),
  ],
  async (req, res) => {
    try {
     const errors = validationResult(req);
   //Check if there are errors 
    if (!errors.isEmpty()) {
    //If so Send response status with the error message
      return res
        .status(500)
        .json({ status: false, data: errors.array()[0].msg });
    }
//... Rest of code is here ... 
    } catch (error) {
      res.status(500).json({ status: false, error: error.message });
    }
  }
);

我建议您阅读有关快速路由和将响应状态传递给前端的内容

必须说响应取决于您的实施您也可以使用

res.send(errors.array()[0].msg)

只发送消息本身。在上面的代码中，我使用 json obj 和响应状态来区分错误类型。这完全取决于您的决定，希望这是有道理的。祝你好运

将错误消息从 mongoose 验证转换为用户友好的消息

converting error messages from mongoose validation to user friendly messages

forms

validation

ejs

mongoose

node.js