NSMergeConflict用于具有单个ManagedObjectContext的NSManagedObject

问题描述

我使用coreData，我有一对多的文件夹和文件之间的关系。

我只使用一个MOC通过我的应用程序。我只是将它传递给不同的

viewControllers，执行添加，编辑，删除和保存操作。

我的rootViewController使用NSfetchResultsController，我使用它创建文件夹，保存并显示在我的表上。

保存我这样做

  NSError * error; 
 if（！[self.managedObjectContext save：& error]）{
 //用代码替换此实现，以正确处理错误。 
 // abort（）导致应用程序生成崩溃日志并终止。您不应在运送应用程序中使用此功能，但在开发过程中可能很有用。 
 NSLog（@未解析的错误％@，％@，错误，[错误userInfo]）; 
 abort（）; 
} 
  

然后每当我选择一个文件夹时，我打开一个文件ViewController，我通过MOC以这种方式文件VC

  FileViewController * file = [[FileViewController alloc] initWithNibName：@FileViewController零]; 
 
 file.managedObjectContext = self.managedObjectContext; 
 file.controller = self.controller; 
  

然后我在FileVC中创建一个文件并再次保存在FileVC中，这样

  NSError * error; 
 if（！[self.managedObjectContext save：& error]）{
 //用代码替换此实现，以正确处理错误。 
 // abort（）导致应用程序生成崩溃日志并终止。您不应在运送应用程序中使用此功能，但在开发过程中可能很有用。 
 NSLog（@未解析的错误％@，％@，错误，[错误userInfo]）; 
 abort（）; 
} 
  

这样做，我使用两个MOC或单个MOC？ p>

在我的appdelegate.m，我也试过了这个

  self.rootViewController = [[RootViewController alloc] initWithNibName：@RootViewControllerbundle：nil]; 
 
 _navigationController = [[UINavigationController alloc] initWithRootViewController：self.rootViewController]; 
 [self.managedObjectContext setMergePolicy：NSMergeByPropertyStoreTrumpMergePolicy]; 
 
 self.rootViewController.managedObjectContext = self.managedObjectContext;有时当我在一个文件夹中添加一个文件时，我得到NSMergeConflict for NSManagedObject
 
 
 
 
请帮助
 
 
 
尊敬
 Ranjit。
解决方案
我确定你只使用一个管理对象上下文。你必须创建第二个，使用第二个。虽然即使我是对的，我对NSMergeConflict没有评论，因为我现在正在处理自己。
 
I am working with coreData, I have one to many relationship between folders and files.

I am using only one MOC through out my application.I am just passing it to different 

viewControllers , performing operations like add, edit, delete and then saving.

My rootViewController uses NSfetchResultsController, I create folders using it, save  and display on my table.

saving I do it this way
        NSError *error;
        if (![self.managedObjectContext save:&error]) {
            // Replace this implementation with code to handle the error appropriately.
            // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
            NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
            abort();
        }
then whenever I select a folder, I open a file ViewController, while opening, I pass the MOC to file VC this way
         FileViewController *file = [[FileViewController alloc] initWithNibName:@"FileViewController" bundle:nil];

        file.managedObjectContext = self.managedObjectContext;
        file.controller = self.controller;
then I create a file inside FileVC and again save it in FileVC, this way 
        NSError *error;
        if (![self.managedObjectContext save:&error]) {
            // Replace this implementation with code to handle the error appropriately.
            // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
            NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
            abort();
        }
by doing this, am I using two MOC's or a single MOC?
In my appdelegate.m, I also tried this
self.rootViewController = [[RootViewController alloc] initWithNibName:@"RootViewController" bundle:nil];

            _navigationController = [[UINavigationController alloc] initWithRootViewController:self.rootViewController];
            [self.managedObjectContext setMergePolicy:NSMergeByPropertyStoreTrumpMergePolicy];

            self.rootViewController.managedObjectContext = self.managedObjectContext;
Sometimes when I add a file inside a folder , I get "NSMergeConflict for NSManagedObject"
Please help
RegardsRanjit.
 解决方案 
I'm pretty sure you're using only the one managed object context.  You'd have to create a second one to be using a second one.  Although even if I'm right about that, I have no comment about the NSMergeConflict as I'm dealing with that myself right now.
                        
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