CoreData 1570错误代码

Question

目前我的所有保存都将转到内存中,但不会写入磁盘(iOS).我的应用程序设置为UITableView带有一个添加模态视图,用于创建内容,当用户完成创建内容并单击保存按钮时,新项目(由我的CoreData模型创建的NSManagedObject类)我打印出来并且完全填写.在此之后我立即尝试将其保存到磁盘,并生成一个错误消息,其中包含相同的对象ID,但字段为nil.然而,在我之间的UITableViews (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath 方法被调用,即记录@"CanEdit".

谁能看到我做错了什么？

这是代码

        NSLog(@"newItem %@", newItem);
    NSError *error;
    if (![newItem.managedObjectContext save:&error]) {
        // Handle the error.
        NSLog(@"%@", error);
    }

    if (editItem) {
        [self.navigationController popViewControllerAnimated:YES];
    } else {
        [self dismissModalViewControllerAnimated:YES];            
    }

这是我的错误

2011-10-22 15:24:46.322 App[42115:fb03] newItem <Item: 0x81a4a30> (entity: Item; id: 0x81a0ab0 <x-coredata:///Item/t7F2B54D2-0DCC-4530-88D5-900BE25C7DC23> ; data: {
    containedIn = "0x6e89010 <x-coredata:///Item/t7F2B54D2-0DCC-4530-88D5-900BE25C7DC22>";
    contains =     (
    );
    content = a;
    dateLastUsed = nil;
    depth = 0;
    encrypted = 0;
    favorite = 0;
    favoritePosition = nil;
    folder = 0;
    fullPath = "^Templates^Add Title";
    name = a;
    sortPosition = 0;
})
2011-10-22 15:24:46.323 App[42115:fb03] CanEdit
2011-10-22 15:24:46.326 App[42115:fb03] Error Domain=NSCocoaErrorDomain Code=1570 "The operation couldn’t be completed. (Cocoa error 1570.)" UserInfo=0x6ecc490     
{NSValidationErrorObject=<Item: 0x6e88fb0> (entity: Item; id: 0x6e89010 <x-coredata:///Item/t7F2B54D2-0DCC-4530-88D5-900BE25C7DC22> ; data: {
    containedIn = nil;
    contains =     (
        "0x81a0ab0 <x-coredata:///Item/t7F2B54D2-0DCC-4530-88D5-900BE25C7DC23>"
    );
    content = nil;
    dateLastUsed = nil;
    depth = 0;
    encrypted = 0;
    favorite = 0;
    favoritePosition = nil;
    folder = 1;
    fullPath = "^Templates^";
    name = Templates;
    sortPosition = 0;
}), NSValidationErrorKey=content, NSLocalizedDescription=The operation couldn’t be completed. (Cocoa error 1570.)}

Answer 1

问题是您的上下文中有一个MO,其中必填字段设置为nil.具体来说,这就是说NSValidationErrorKey=content前面的内容NSValidationErrorObject是打印为零.

您有一个逻辑错误,其中您的值未正确设置在MO中,或者您应该更改模型以使该字段可选.