Realm.io 'RLMArray is no longer valid' 删除具有子对象的 RLMObject 时
Realm.io 'RLMArray is no longer valid' when deleting an RLMObject that has had children objects
在我的应用程序中,我不断收到 'RLMException',原因:'RLMArray is no longer valid' 在尝试删除包含与另一个 RLMObject 的一对多关系的 RLMObject 时。例如:'Task' 是 RLMObject,它包含一个 RLMArray 'records',其中类型为 'Record' RLMObjects。抛错代码如下:
public class func deleteTask(#taskName: String, retainRecords: Bool) {
let realm = Database.getRealm()
let currentTask = (Task.objectsWhere("name = '\(taskName)'").objectAtIndex(0) as Task)
let loopCount:UInt = currentTask.records.count
if (retainRecords) {
for var i:UInt = 0; i < loopCount; ++i {
Database.moveRecord(record: (currentTask.records.objectAtIndex(0) as Record), newTask: "Taskless Records")
}
} else {
for var i:UInt = 0; i < loopCount; ++i {
Database.deleteRecord(record: currentTask.records.objectAtIndex(0) as Record)
}
}
realm.beginWriteTransaction()
realm.deleteObject(currentTask)
realm.commitWriteTransaction()
}
程序抛出异常就行了,
realm.commitWriteTransaction()
在尝试删除任务之前,循环正在移动或删除任务下的所有子数据库对象。移动和删除记录都可以正常工作。还有最后一个重要说明,如果任务不包含其下的记录,则删除它没有问题,也不会抛出异常。
感谢任何人的帮助,我一直在为这个问题撞墙。
--根据yoshyosh的回复新修改--
我已将我的代码修改为以下内容。我仍然收到同样的错误。
public class func deleteTask(#taskName: String, retainRecords: Bool) {
let realm = Database.getRealm()
let currentTask = (Task.objectsWhere("name = '\(taskName)'").firstObject() as Task)
let currentRecords = currentTask.records
let parent = currentTask.parent
if (retainRecords) {
let loopCount:UInt = currentTask.records.count
for var i:UInt = 0; i < loopCount; ++i {
Database.moveRecord(record: (currentTask.records.firstObject() as Record), newTaskName: "Taskless Records")
}
} else {
realm.transactionWithBlock { () -> Void in
realm.deleteObjects(currentRecords)
}
}
realm.transactionWithBlock { () -> Void in
realm.deleteObject(currentTask)
}
}
public class func moveRecord(#record: Record, newTaskName: String) {
let realm = Database.getRealm()
let oldTask = record.parent
let oldIndex = oldTask.records.indexOfObject(record)
let newTask = (Task.objectsWhere("name = '\(newTaskName)'")).firstObject() as Task
realm.transactionWithBlock { () -> Void in
oldTask.records.removeObjectAtIndex(oldIndex)
newTask.records.addObject(record)
}
}
public class func addTask(#name: String, memo: String, time: Double, categoryName: String) {
let realm = Database.getRealm()
let parentCategory = (Category.objectsWhere("name = '\(categoryName)'")).firstObject() as Category
realm.transactionWithBlock { () -> Void in
let newTask = Task()
newTask.parent = parentCategory
newTask.name = name
newTask.memo = memo
newTask.timeRemaining = time
parentCategory.tasks.addObject(newTask)
}
}
public class func addRecord(#taskName: String, note: String, timeSpent: Double, date: NSDate) {
let realm = Database.getRealm();
let parentTask = Task.objectsWhere("name = '\(taskName)'").firstObject() as Task
realm.transactionWithBlock { () -> Void in
let newRecord = Record()
newRecord.parent = parentTask
newRecord.note = note
newRecord.timeSpent = timeSpent
newRecord.date = date
parentTask.records.addObject(newRecord)
}
}
如果需要,我还可以添加用于向数据库添加新记录和新任务的代码。 Yoshyosh 感谢您的评论,因为它确实帮助我清理了我的代码,不幸的是,删除任务时仍然会抛出错误。
我在测试应用程序时注意到一件奇怪的事情,当我尝试删除任务时它崩溃了,但是一旦我再次打开应用程序,任务和所有记录都会被删除。
--解--
我发现我在完全错误的地方寻找错误。它是由 TableView View Controller 引起的,该 TableView View Controller 填充了来自传递给它的任务的记录。它使用 RLMArray 从任务中检索 recordList 并使用 notificationToken 重新加载 tableView 数据。
var currentTask:Task!
var recordList:RLMArray!
var notificationToken: RLMNotificationToken?
override func viewDidLoad() {
super.viewDidLoad()
recordList = currentTask.records
notificationToken = RLMRealm.defaultRealm().addNotificationBlock { note, realm in
self.tableView.reloadData()
}
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return Int(self.recordList.count)
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
return Factory.prepareRecordCell(tableView: tableView, recordList: self.recordList, indexPath: indexPath)
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
当我从单独的视图中删除任务时,它会尝试使用已删除任务的 'recordsList' RLMArray 重新加载数据。
删除 notificationToken 并在 viewWillAppear() 函数中手动重新加载 tableView 数据后,删除任务完美无缺。
我不确定您的具体情况,您需要显示更多发生 deleteRecord 的代码。我已尝试尽可能最好地重现您的案例,但使用以下代码已将所有内容删除:
let currentTask = Task.allObjects().firstObject() as Task
let currentRecords = currentTask.records
let loopCount = currentRecords.count
for var i:UInt = 0; i < loopCount; i++ {
realm.transactionWithBlock({ () -> Void in
var recordToDelete = currentTask.records.objectAtIndex(0) as Record
realm.deleteObject(recordToDelete)
})
}
realm.transactionWithBlock { () -> Void in
realm.deleteObject(currentTask)
}
我认为删除所有相关对象的更简单方法是这样的:
let currentTask = Task.allObjects().firstObject() as Task
let currentRecords = currentTask.records
// Delete Task and records that are connected to it
realm.transactionWithBlock { () -> Void in
realm.deleteObjects(currentRecords)
realm.deleteObject(currentTask)
}
这是用其他记录更新您的任务的简单方法。尽管此代码缺少您更新这些记录的父级的部分
let currentTask = Task.objectsWhere("name = %@", "First task").firstObject() as Task
let currentRecords = currentTask.records
let newFetchedTask = Task.objectsWhere("name = %@", "New Task").firstObject() as Task
realm.transactionWithBlock { () -> Void in
newFetchedTask.records.addObjects(currentRecords)
currentTask.records.removeAllObjects()
}
随时post更多代码来调试您的特定案例
在我的应用程序中,我不断收到 'RLMException',原因:'RLMArray is no longer valid' 在尝试删除包含与另一个 RLMObject 的一对多关系的 RLMObject 时。例如:'Task' 是 RLMObject,它包含一个 RLMArray 'records',其中类型为 'Record' RLMObjects。抛错代码如下:
public class func deleteTask(#taskName: String, retainRecords: Bool) {
let realm = Database.getRealm()
let currentTask = (Task.objectsWhere("name = '\(taskName)'").objectAtIndex(0) as Task)
let loopCount:UInt = currentTask.records.count
if (retainRecords) {
for var i:UInt = 0; i < loopCount; ++i {
Database.moveRecord(record: (currentTask.records.objectAtIndex(0) as Record), newTask: "Taskless Records")
}
} else {
for var i:UInt = 0; i < loopCount; ++i {
Database.deleteRecord(record: currentTask.records.objectAtIndex(0) as Record)
}
}
realm.beginWriteTransaction()
realm.deleteObject(currentTask)
realm.commitWriteTransaction()
}
程序抛出异常就行了,
realm.commitWriteTransaction()
在尝试删除任务之前,循环正在移动或删除任务下的所有子数据库对象。移动和删除记录都可以正常工作。还有最后一个重要说明,如果任务不包含其下的记录,则删除它没有问题,也不会抛出异常。
感谢任何人的帮助,我一直在为这个问题撞墙。
--根据yoshyosh的回复新修改--
我已将我的代码修改为以下内容。我仍然收到同样的错误。
public class func deleteTask(#taskName: String, retainRecords: Bool) {
let realm = Database.getRealm()
let currentTask = (Task.objectsWhere("name = '\(taskName)'").firstObject() as Task)
let currentRecords = currentTask.records
let parent = currentTask.parent
if (retainRecords) {
let loopCount:UInt = currentTask.records.count
for var i:UInt = 0; i < loopCount; ++i {
Database.moveRecord(record: (currentTask.records.firstObject() as Record), newTaskName: "Taskless Records")
}
} else {
realm.transactionWithBlock { () -> Void in
realm.deleteObjects(currentRecords)
}
}
realm.transactionWithBlock { () -> Void in
realm.deleteObject(currentTask)
}
}
public class func moveRecord(#record: Record, newTaskName: String) {
let realm = Database.getRealm()
let oldTask = record.parent
let oldIndex = oldTask.records.indexOfObject(record)
let newTask = (Task.objectsWhere("name = '\(newTaskName)'")).firstObject() as Task
realm.transactionWithBlock { () -> Void in
oldTask.records.removeObjectAtIndex(oldIndex)
newTask.records.addObject(record)
}
}
public class func addTask(#name: String, memo: String, time: Double, categoryName: String) {
let realm = Database.getRealm()
let parentCategory = (Category.objectsWhere("name = '\(categoryName)'")).firstObject() as Category
realm.transactionWithBlock { () -> Void in
let newTask = Task()
newTask.parent = parentCategory
newTask.name = name
newTask.memo = memo
newTask.timeRemaining = time
parentCategory.tasks.addObject(newTask)
}
}
public class func addRecord(#taskName: String, note: String, timeSpent: Double, date: NSDate) {
let realm = Database.getRealm();
let parentTask = Task.objectsWhere("name = '\(taskName)'").firstObject() as Task
realm.transactionWithBlock { () -> Void in
let newRecord = Record()
newRecord.parent = parentTask
newRecord.note = note
newRecord.timeSpent = timeSpent
newRecord.date = date
parentTask.records.addObject(newRecord)
}
}
如果需要,我还可以添加用于向数据库添加新记录和新任务的代码。 Yoshyosh 感谢您的评论,因为它确实帮助我清理了我的代码,不幸的是,删除任务时仍然会抛出错误。
我在测试应用程序时注意到一件奇怪的事情,当我尝试删除任务时它崩溃了,但是一旦我再次打开应用程序,任务和所有记录都会被删除。
--解--
我发现我在完全错误的地方寻找错误。它是由 TableView View Controller 引起的,该 TableView View Controller 填充了来自传递给它的任务的记录。它使用 RLMArray 从任务中检索 recordList 并使用 notificationToken 重新加载 tableView 数据。
var currentTask:Task!
var recordList:RLMArray!
var notificationToken: RLMNotificationToken?
override func viewDidLoad() {
super.viewDidLoad()
recordList = currentTask.records
notificationToken = RLMRealm.defaultRealm().addNotificationBlock { note, realm in
self.tableView.reloadData()
}
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return Int(self.recordList.count)
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
return Factory.prepareRecordCell(tableView: tableView, recordList: self.recordList, indexPath: indexPath)
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
当我从单独的视图中删除任务时,它会尝试使用已删除任务的 'recordsList' RLMArray 重新加载数据。
删除 notificationToken 并在 viewWillAppear() 函数中手动重新加载 tableView 数据后,删除任务完美无缺。
我不确定您的具体情况,您需要显示更多发生 deleteRecord 的代码。我已尝试尽可能最好地重现您的案例,但使用以下代码已将所有内容删除:
let currentTask = Task.allObjects().firstObject() as Task
let currentRecords = currentTask.records
let loopCount = currentRecords.count
for var i:UInt = 0; i < loopCount; i++ {
realm.transactionWithBlock({ () -> Void in
var recordToDelete = currentTask.records.objectAtIndex(0) as Record
realm.deleteObject(recordToDelete)
})
}
realm.transactionWithBlock { () -> Void in
realm.deleteObject(currentTask)
}
我认为删除所有相关对象的更简单方法是这样的:
let currentTask = Task.allObjects().firstObject() as Task
let currentRecords = currentTask.records
// Delete Task and records that are connected to it
realm.transactionWithBlock { () -> Void in
realm.deleteObjects(currentRecords)
realm.deleteObject(currentTask)
}
这是用其他记录更新您的任务的简单方法。尽管此代码缺少您更新这些记录的父级的部分
let currentTask = Task.objectsWhere("name = %@", "First task").firstObject() as Task
let currentRecords = currentTask.records
let newFetchedTask = Task.objectsWhere("name = %@", "New Task").firstObject() as Task
realm.transactionWithBlock { () -> Void in
newFetchedTask.records.addObjects(currentRecords)
currentTask.records.removeAllObjects()
}
随时post更多代码来调试您的特定案例