小编Ale*_*kin的帖子

当RKObjectManager中此对象的POST/PUT请求失败时,如何丢弃对NSManagedObject实例所做的CoreData更改？

NSManagedObject *object = ...;
[object setValue:@"test" forKey: @"test"];
[[RKObjectManager sharedManager] postObject:object 
                                 parameters:nil 
                                    success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) { NSLog(@"success, nothing to do"); }
                                    failure:^(RKObjectRequestOperation *operation, NSError *error) { 
  // I want to discard changes made to object here 
}

更新:RestKit 0.20

我对此查询有疑问:

SELECT * 
  FROM runs 
 WHERE (NOW() BETWEEN began_at 
                  AND finished_at)

你认为为beginning_at和finished_at列创建复合索引是否有意义？或者只为starts_at创建索引是有意义的？