核心数据关系错误

Question

我想保存目标和演员.这两个实体与责任关系相关:

Goal *addgoal = (Goal*)[NSEntityDescription insertNewObjectForEntityForName:@"Goal" inManagedObjectContext:context];

    addgoal.goalNaam = nameTextField.text;
    addgoal.goalId = idField.text;
    addgoal.goalBeschrijving = beschrijvingField.text;

    Actor *addactor = (Actor*)[NSEntityDescription insertNewObjectForEntityForName:@"Actor" inManagedObjectContext:context];

    addactor.actorNaam = responsibleField.text;

    [addgoal addResponsibilityObject:addactor];

上面的行([addgoal addResponsibility:addactor])导致错误,有什么问题？

在Goal.h中:

@interface Goal (CoreDataGeneratedAccessors)
- (void)addResponsibilityObject:(Actor *)value;
@end

错误:

2012-08-02 20:57:11.838 Choose3 [7434:fb03] - [__ NSCFSet实体]:无法识别的选择器发送到实例0x8877810 2012-08-02 20:57:11.840选择3 [7434:fb03] *终止应用程序由于未被捕获异常'NSInvalidArgumentException',原因:' - [__ NSCFSet实体]:无法识别的选择器发送到实例0x8877810'

Answer 1

我刚遇到同样的问题.这里的解决方案是,我忘了检查模型检查器中关系选项中的"To-Many"选项.