autosavesInPlace导致新文档保存失败 [英] autosavesInPlace causes New Document save to fail

问题描述

我有一个基于NSPersistentDocument的应用程序，当 autosavesInPlace 设置为返回 YES 时，它无法保存新文档，返回否，问题消失。

I have a NSPersistentDocument based app which fails to save a new document when autosavesInPlace is set to return YES , return NO and the problem disappears.

• 我创建一个新文档


• 进行一些更改


• 保存它，从而运行 NSSaveAsOperation ，文档名称和URL更改，并且一切似乎都很好，但是下一次保存将抛出非常具有描述性的

• I create a new document
• Make some changes
• Save it , thus running NSSaveAsOperation , the name of the document and the URL changes and all appears to be well but the next save will throw a very descriptive

NSPersistentStoreSaveError = 134030，/ /未分类的保存错误-我们所依赖的错误返回了错误

仅当文档尝试在<$ c之后运行保存时才会发生$ c> NSSaveAsOperation 。任何其他保存类型都可以像对现有文档所做的更改一样正常工作。有趣的效果是，如果我不更改名称或位置，我也不会遇到此问题。

This only happens when the document attempts to run a save after a NSSaveAsOperation. Any other save type will work fine as in changes to existing doc. Interesting effect is that if i dont change name or location i dont get this issue either.

我正在获取

frame＃0：0x00007fff988143c5 libobjc的异常回溯。 A.dylib objc_exception_throw
框架＃1：0x00007fff94c5f5f9 CoreData -[NSPersistentStore（_NSInternalMethods）_preflightCrossCheck] + 697
框架＃2：0x00007fff94c3198b CoreData $ c>-[NSPersistentStoreCoordinator executeRequest：withContext：error：] + 603
框架＃3：0x00007fff94c5aa98 CoreData -[NSManagedObjectContext保存：] + 456
框架＃4：0x00007fff91baa101 AppKit -[NSPersistentDocument writeToURL：ofType：forSaveOperation：originalContentsURL：error：] + 3743
帧＃5：0x0000000100002de7 ZZZZ -[ZZZZDocument writeToURL：ofType：forSaveOperation：originalContentsURL：错误：] + 135 at ZZZZDocument.m：209
帧＃6：0x00007fff91baabc7 AppKit -[NSPersistentDocument writeSafelyToURL：ofType：forSaveOperation：error：] + 611
帧＃7：0x0000000100002ea3 ZZZZ -[ZZZZDoc注释writeSafelyToURL：ofType：forSaveOperation：error：] + 115 at ZZZZDocument.m：223

frame #0: 0x00007fff988143c5 libobjc.A.dylibobjc_exception_throw frame #1: 0x00007fff94c5f5f9 CoreData-[NSPersistentStore(_NSInternalMethods) _preflightCrossCheck] + 697 frame #2: 0x00007fff94c3198b CoreData-[NSPersistentStoreCoordinator executeRequest:withContext:error:] + 603 frame #3: 0x00007fff94c5aa98 CoreData-[NSManagedObjectContext save:] + 456 frame #4: 0x00007fff91baa101 AppKit-[NSPersistentDocument writeToURL:ofType:forSaveOperation:originalContentsURL:error:] + 3743 frame #5: 0x0000000100002de7 ZZZZ-[ZZZZDocument writeToURL:ofType:forSaveOperation:originalContentsURL:error:] + 135 at ZZZZDocument.m:209 frame #6: 0x00007fff91baabc7 AppKit-[NSPersistentDocument writeSafelyToURL:ofType:forSaveOperation:error:] + 611 frame #7: 0x0000000100002ea3 ZZZZ-[ZZZZDocument writeSafelyToURL:ofType:forSaveOperation:error:] + 115 at ZZZZDocument.m:223

有什么想法吗？

推荐答案

未包装的核心数据文件不可能

Its not possible for a un-wrappered core data file

捕获 NSSaveAsOperation 并在该持久性存储上进行迁移，以获取该枚举 ...- journal 文件的构造将无法在沙箱外部创建它。

In the event you attempt to trap NSSaveAsOperation and do a migrate on the persistent store for that enum the construction of the ...-journal file will fail to create as its outside the sandbox.

-(void)saveToURL:(NSURL *)url ofType:(NSString *)typeName forSaveOperation:(NSSaveOperationType)saveOperation completionHandler:(void (^)(NSError *))completionHandler
{
    NSLog(@" save op = %ld to %@ ",saveOperation,url);
    NSURL *targeturl = url;

    if(saveOperation == NSSaveAsOperation)
    {
        //migrate pstore
        NSPersistentStore *store = [self.managedObjectContext.persistentStoreCoordinator.persistentStores lastObject];
        if (store)
        {
            NSMutableDictionary *opts = [NSMutableDictionary dictionary];
            [opts setValue:[NSNumber numberWithBool:YES] forKey:NSInferMappingModelAutomaticallyOption];
            [opts setValue:[NSNumber numberWithBool:YES] forKey:NSMigratePersistentStoresAutomaticallyOption];

            NSError *error = NULL;

            NSPersistentStore *newstore =  [self.managedObjectContext.persistentStoreCoordinator migratePersistentStore:store toURL:url options:opts withType:store.type error:&error];

            if(newstore == nil)
            {
                NSLog(@"migration error %@",[error localizedDescription]);
            }

            self.fileURL = url;


        }


    }

    [super saveToURL:targeturl ofType:typeName forSaveOperation:saveOperation completionHandler:completionHandler];
}

因此我们需要将文件包装在非使用 NSPersistentDocument 框架很简单。

So we need to wrapper the file in a bundle/folder which is non-trivial using the NSPersistentDocument framework.

在这里等待 NSManagedDocument （那就是希望的API）

Heres waiting for NSManagedDocument (thats a wishing well API)

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