如何在自定義回送驗證中提供動態消息？

Question

Here是從文檔：

User.validate('name', customValidator, {message: 'Bad name'}); 
function customValidator(err) { 
    if (this.name === 'bad') err(); 
}); 
var user = new User({name: 'Peter'}); 
user.isValid(); // true 
user.name = 'bad'; 
user.isValid(); // false 

有驗證過程中修改message變量的方法嗎？例如，this.name === 'bad'的消息是Bad name，但是當this.name === 'very bad'的消息應該是Very Bad name。如何做到這一點？

Answer 1

突然有一個addError方法與簽名errors.add(attr, message, code)，所以：

User.validate('name', customValidator); 
function customValidator(err) { 
    if (this.name === 'bad') { 
     this.errors.add('name', `Name is bad`, 'name.bad') 
     err(); 
    } 
    if (this.name === 'very bad') { 
     this.errors.add('name', `Name is very bad`, 'name.very.bad') 
     err(); 
    } 
}); 

這工作，但請記住，你將有+1custom代碼和信息，請參閱從粗糙error.details.codes.name和error.details.messages.name路徑json下面：

{ 
    "error": { 
    "statusCode": 422, 
    "name": "ValidationError", 
    "message": "The `Entity` instance is not valid. Details: `name` Name is very bad (value: very bad).", 
    "details": { 
     "context": "Entity", 
     "codes": { 
     "name": [ 
      "name.very.bad", 
      "custom" 
     ], 
     }, 
     "messages": { 
     "name": [ 
      "Name is very bad", 
      "is invalid" 
     ] 
     } 
    }, 
    "stack": "..." 
    } 
}