保存域类时“grails.validation.ValidationErrors：0 errors”

Question

我有以下域类：

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
      }

}

但是当我使用以下代码保存此类的实例时：

 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+"-------"
        }
}

我得到了这个：

grails.validation.ValidationErrors: 0 errors

没有其他错误解释。任何帮助都会非常感激。

Answer 1

你正在检查错误的实例。它应该如下：

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