ios – 魔法记录没有保存

我正在使用魔法记录：
https://github.com/magicalpanda/MagicalRecord

我试图使用魔法记录和核心数据保存从我的网站到sqllite数据库的记录,但我一直收到错误：

MR_saveWithErrorCallback:](0xaaa6bd0) NO CHANGES IN CONTEXT <NSManagedObjectContext (0xaaa6bd0): *** BACKGROUND SAVING (ROOT) ***> on *** BACKGROUND THREAD *** - NOT SAVING

这是代码：

for(int i = 0; i < count; i += 1)
             {
                 // results  = array of all services from site
                 NSDictionary * result = [results objectAtIndex: i];

                 NSNumber * sid = @([[result objectForKey: @"id"] intValue]);
                 NSNumber * parent = @([[result objectForKey: @"parent"] intValue]);
                 Service * service  = [Service createEntity];

                 NSString * image = [NSString stringWithFormat: @"%@",[result objectForKey: @"image"]];

                 NSString * name  = [NSString stringWithFormat: @"%@",[result objectForKey: @"name"]];
                 NSString * machine_name  = [NSString stringWithFormat: @"%@",[result objectForKey: @"machine_name"]];


                 [service setDate: [NSDate date]];
                 [service setSid: sid];
                 [service setName: name];

                 [service setImage: image];
                 [service setParent: parent];
                 [service setMachine_name: machine_name];


                 [[NSManagedObjectContext defaultContext] saveNestedContexts];

解决方法

问题是您没有保存正确的上下文.如果查看源代码,[Service createEntity]会在当前线程的上下文中创建ManagedObject.不在defaultContext中.

所以你需要做的是,而不是[[NSManagedObjectContext defaultContext] saveNestedContexts],你应该保存当前线程的上下文(即创建ManagedObject的上下文).所以代码应该是[[NSManagedObjectContext MR_contextForCurrentThread]