Question

我正在Grails上写一个应用程序。我正在尝试使用addTo-method将子数据库记录添加到父表。我按照有关addTo-method的this文档进行操作。例如，文档说创建父类：

class Author {    String name
    static hasMany = [fiction: Book, nonFiction: Book]
}

按照这个我创建了我的父类：

class Cafee {

    String cafeeName = ""
    int totalReservationPlaces = 0
    double placeCost = 0
    String currencyType = ""
    boolean isReservationAvailable = false
    boolean reservationTimeLimit = false
    boolean reservationDateLimit = false
    int totalPlaces = 0
    long startTimeLimit = 0
    long endTimeLimit = 0
    Date startDateLimit = new Date()
    Date endDateLimit = new Date()  

    static constraints = {
        cafeeName blank: false, unique: true
    }

    String getCafeeName(){
        return cafeeName
    }

    static hasMany = [admin: Person]
}

文档说创建子类：

class Book {    String title
    static belongsTo = [author: Author]
}

按照这个我创建了我的孩子班：

class Person {

    transient springSecurityService

    String username
    String password
    boolean enabled = true
    boolean accountExpired
    boolean accountLocked
    boolean passwordExpired

    String firstName
    String lastName
    String email
    String inn = ""
    boolean isAdminCafee = false
    static transients = ['springSecurityService']

    static belongsTo = [cafee:Cafee]

    static constraints = {
        username blank: false, unique: true
        firstName blank: false
        lastName blank: false
        password blank: false
        email blank: false, unique: true
    }

    static mapping = {
        password column: '`password`'
    }

    Set<Authority> getAuthorities() {
        PersonAuthority.findAllByPerson(this).collect { it.authority }
    }

    def beforeInsert() {
        encodePassword()
    }

    def beforeUpdate() {
        if (isDirty('password')) {
            encodePassword()
        }
    }

    protected void encodePassword() {
        password = springSecurityService?.passwordEncoder ? springSecurityService.encodePassword(password) : password
    }
}

并且文档说要向父母添加子记录我必须这样做：

def fictBook = new Book(title: "IT")
def nonFictBook = new Book(title: "On Writing: A Memoir of the Craft")
def a = new Author(name: "Stephen King")
             .addToFiction(fictBook)
             .addToNonFiction(nonFictBook)
             .save()

在Bootstrap中关注它我已经完成了这个：

def user = Person.findOrSaveWhere(username: 'testerAndrewRes', password:'password', firstName:'Andrew', lastName:'Bobkov', email:'pragm@gmail.com', isAdminCafee: true,
             inn: '1234567890')
         println user
         if(!user.authorities.contains(adminRole))
         {
             PersonAuthority.create(user, adminRole, true)
         }
         def newCafe = new Cafee(cafeeName: "Tarelka").addToAdmin(user).save()

但是我收到了一个错误：

ERROR context.GrailsContextLoaderListener  - Error initializing the application: object references an unsaved transient instance - save the transient instance before flushing: restorator.auth.Person; nested exception is org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: restorator.auth.Person
Message: object references an unsaved transient instance - save the transient instance before flushing: restorator.auth.Person; nested exception is org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: restorator.auth.Person

我做错了什么？

Answer 1

我认为错误信息很明确。
尝试添加：

user.save(flush:true)

之前：

def newCafe = new Cafee(cafeeName: "Tarelka").addToAdmin(user).save()

Grails - 在刷新之前保存瞬态实例

1 个答案: