Grails 删除即使在服务中也不起作用？

我有一本书

package bookfinal

class Book {

    String name
    static constraints = {
    }
}

图书管理员如下

package bookfinal

class BookController {

    def bookService

    def destroy(Long id){
        bookService.destroy(id)
        redirect(action:'index')
    }

    def index() {

        [books: Book.findAll()]
    }

    def create(){

    }

    def save(){
        def book = new Book(params)
        book.save()
        redirect(action:'show', id:book.id)
    }

    def edit(Long id){
        [book: Book.get(id)]
    }

    def update(Long id){
        bookService.update(id, params)
        redirect(action:'index')
    }

    def show(Long id){
        [book: Book.get(id)]
    }


}

package bookfinal

import grails.gorm.transactions.Transactional

@Transactional
class BookService {

    def destroy(Long id) {

        def b = Book.get(id)
        b.delete()

    }


    def update(Long id, params){

        def book = Book.get(id)
        book.properties = params
        book.save()
    }

}

<h1> ${book.name} </h1>

<g:link action="edit" id="${book.id}">Edit</g:link>
<g:link action="destroy" id="${book.id}">Delete</g:link>
<g:link action="index">Back</g:link>

服务如下

package bookfinal

class BookController {

    def bookService

    def destroy(Long id){
        bookService.destroy(id)
        redirect(action:'index')
    }

    def index() {

        [books: Book.findAll()]
    }

    def create(){

    }

    def save(){
        def book = new Book(params)
        book.save()
        redirect(action:'show', id:book.id)
    }

    def edit(Long id){
        [book: Book.get(id)]
    }

    def update(Long id){
        bookService.update(id, params)
        redirect(action:'index')
    }

    def show(Long id){
        [book: Book.get(id)]
    }


}

package bookfinal

import grails.gorm.transactions.Transactional

@Transactional
class BookService {

    def destroy(Long id) {

        def b = Book.get(id)
        b.delete()

    }


    def update(Long id, params){

        def book = Book.get(id)
        book.properties = params
        book.save()
    }

}

<h1> ${book.name} </h1>

<g:link action="edit" id="${book.id}">Edit</g:link>
<g:link action="destroy" id="${book.id}">Delete</g:link>
<g:link action="index">Back</g:link>

显示页面如下

package bookfinal

class BookController {

    def bookService

    def destroy(Long id){
        bookService.destroy(id)
        redirect(action:'index')
    }

    def index() {

        [books: Book.findAll()]
    }

    def create(){

    }

    def save(){
        def book = new Book(params)
        book.save()
        redirect(action:'show', id:book.id)
    }

    def edit(Long id){
        [book: Book.get(id)]
    }

    def update(Long id){
        bookService.update(id, params)
        redirect(action:'index')
    }

    def show(Long id){
        [book: Book.get(id)]
    }


}

package bookfinal

import grails.gorm.transactions.Transactional

@Transactional
class BookService {

    def destroy(Long id) {

        def b = Book.get(id)
        b.delete()

    }


    def update(Long id, params){

        def book = Book.get(id)
        book.properties = params
        book.save()
    }

}

<h1> ${book.name} </h1>

<g:link action="edit" id="${book.id}">Edit</g:link>
<g:link action="destroy" id="${book.id}">Delete</g:link>
<g:link action="index">Back</g:link>

${book.name}
编辑
删除
返回

---

现在，当我单击delete时，它会重定向到index，但记录不会被删除。为什么删除即使在服务中也不起作用？我使用的是Grails3.3.2版本。当我执行delete（flush:true）时，它可以工作，但我希望delete（）可以在服务中工作，因为它是事务性的。我遗漏了什么吗？谢谢你的帮助。谢谢

这是Grails3的变化之一。检查：

save

方法通知持久性上下文应该保存或更新实例。除非使用

flush

参数，否则对象不会立即持久化

:

在GORM的早期版本中，刷新模式默认为自动。使用此设置，在每次查询之前，无论是否存在事务，都会刷新会话

如果开发人员没有完全理解

AUTO

的行为，在查询之前频繁刷新会话可能会导致意外的性能后果

记住这一点，

COMMIT

是GORM 6中新的默认刷新模式，它将在事务提交时刷新会话。您可以通过在应用程序配置（例如application.yml）中配置刷新模式来恢复以前的行为：