Question

我正在使用Grails 2.3.5并且我有一个包含ajaxDelete方法的控制器。此方法接收名称作为要删除的实体的String。我正在使用服务删除我在控制器中调用的实体。

第一次调用服务 deleteSvnUser 方法时，将删除SVN用户并更新页面上的div，并显示一条警告，指出该用户已被删除。我第二次删除用户时出现以下错误：

row-was-updated-or-deleted-by-another-transaction-or-unsaved-value-mapping-was...

我已经尝试了几件事来解决这个问题：

将@transactional注释添加到我的服务中（我不应该这样做，因为默认情况下它应该是事务性的。）
刷新我的删除（flush：true）
在删除实体（.refresh）之前刷新实体
检索实体时锁定实体（entity.lock（id））

以上都没有奏效。我不知道还能做些什么来解决这个问题。有人可以帮忙吗？我的代码如下：

控制器

class SvnUserController {

def svnUserService  

def ajaxDelete() {

    if (!params.selectedSvnUser) {
        request.error = "The selected Svn User does not exist"
        render(template:"svnUserList", model:[svnUserInstanceList: SvnUser.list(params).sort{it.name}, svnUserInstanceTotal: SvnUser.count()])              
        return
    }

        String outcome = svnUserService.deleteSvnUser(params.selectedSvnUser)

        switch (outcome){

            case "":
                request.message = "Svn User ${params.selectedSvnUser} deleted"
                break

            default: request.error = outcome
        }

    }        

    def svnUsers =  svnUserService.getAllSvnUsers(params)
    render(template:"svnUserList", model:[svnUserInstanceList: svnUsers, svnUserInstanceTotal: svnUsers.size()])
    return
}
}

服务

class SvnUserService {

 public String deleteSvnUser(String userName) {

    String outcome = ""

    try {

        SvnUser svnUserInstance = SvnUser.findByName(userName)
        def groups = SvnGroupController.findAllBySvnUserName(userName)

        groups.each { SvnGroup group ->

            group.removeFromSvnUsers(svnUserInstance)
            group.save()
        }

        def userPermissionsList = UserPermission.findAllBySvnUser(svnUserInstance)

        userPermissionsList.each {
            def repoDirectory = it.repositoryDirectory
            repoDirectory.removeFromUserPermissions(it)
            it.delete()
        }

        svnUserInstance.merge()
        svnUserInstance.delete()            
    }
    catch (DataIntegrityViolationException e) {
        outcome = "A error occurred while attempting to delete the Svn User from file."
    }


    return outcome
}

}

堆栈跟踪如下：

Error |
2014-06-10 15:10:07,394 [http-bio-8080-exec-6] ERROR errors.GrailsExceptionResolver  -     StaleObjectStateException occurred when processing request: [POST]  /subzero/svnUser/ajaxDelete - parameters:
selectedSvnUser: ruby2
Row was updated or deleted by another transaction (or unsaved-value mapping was  incorrect): [com.uk.nmi.subzero.SvnGroup#2]. Stacktrace follows:
Message: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [com.uk.nmi.subzero.SvnGroup#2]
Line | Method
->>   72 | deleteSvnUser in com.uk.nmi.subzero.SvnUserService
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|     87 | ajaxDelete    in com.uk.nmi.subzero.SvnUserController
|    200 | doFilter . .  in grails.plugin.cache.web.filter.PageFragmentCachingFilter
|     63 | doFilter      in grails.plugin.cache.web.filter.AbstractFilter
|   1145 | runWorker . . in java.util.concurrent.ThreadPoolExecutor
|    615 | run           in java.util.concurrent.ThreadPoolExecutor$Worker
^    744 | run . . . . . in java.lang.Thread

Answer 1

我看不到您的代码有任何问题。 Grails应该处理好交易。

如果您的对象映射设置正确，svnUserInstance.delete()调用也应删除子对象，因此我认为您甚至不需要svnUserInstance = SvnUser.findByName(userName)和删除之间的行。

你是如何调用ajaxDelete的？是否有可能第二次被错误地调用？

grails ajax调用row-was-updated-or-deleted-by-another-transaction-or-unfaved-value-mapping-was

控制器

服务

1 个答案: