「grails.validation.ValidationErrors：0錯誤」，同時節省域類

Question

我有以下域類：

class StudentQuiz { 
     Date dateCreated 
     Date lastUpdated 
     Quiz quiz 
     float price 
     Student student 
     Date startTime 
     Date endTime 
     int score 
     List answers 
     static hasMany = [answers:Answer] 
     static constraints = { 
     answers nullable:true 
     } 

} 

但是，當我使用下面的代碼保存這個類的一個實例：

與錯誤有其他解釋

grails.validation.ValidationErrors: 0 errors 

：

studentInstance = (Student)User.findByEmailAndPassword(params.email, params.password.toString().encodeAsPassword()) 
if (studentInstance) { 
    StudentQuiz studentQuizInstance = new StudentQuiz(score:0, quiz:quizInstance,price:quizInstance.price,student:studentInstance,startTime:new Date()) 
    if (!studentQuizInstance.save(flush:true)) {      
     studentInstance.errors.each { 
      println "===="+it+"-------" 
     } 
} 

我正在此。任何幫助將非常感激。

Answer 1

您正在檢查錯誤的實例。它應該是如下：

if (!studentQuizInstance.save(flush:true)) {      
    studentQuizInstance.errors.each { 
    println "===="+it+"-------" 
}