ios - 获取请求模板-获取所有对象

Question

我正在开始使用获取请求模板，因此将尽力解释。请询问是否需要更多详细信息。

我创建了一个获取请求模板:

并尝试在以下方法中打印所有对象:

 - (void)printOfflineActivities 
{
    EntityManager* entityManager = [[EntityManager alloc] init];
    ActivityFetcher *activityFetcher = [[ActivityFetcher alloc] initWithEntityManager:entityManager];
    Activity *activity = [activityFetcher activitiesOffline:[NSNumber numberWithBool:YES]];

    NSLog(@"printing..%@",activity.name);
}

离线事件的代码是

- (Activity*)activitiesOffline:(NSNumber*)offline 
{
    NSDictionary* variables = [NSDictionary dictionaryWithObject:offline forKey:OfflineTemplatePlaceholder];
    NSFetchRequest* request = [entityManager fetchRequestFromTemplateWithName:ActivityOffline substitutionVariables:variables];
    Activity* activity = [entityManager entityForFetchRequest:request];

    return activity;
}

但这仅打印出最后一个值。我不确定如何打印满足条件/表达式的所有事件？

Answer 1

1. 获取请求模板应如下所示(变量用 $ 表示(例如 $VARIABLE_NAME)):

2. 从模型中检索必要的获取请求，如下所示:

   NSFetchRequest* request = [self.managedObjectContext.persistentStoreCoordinator.managedObjectModel fetchRequestFromTemplateWithName:@"ActivityOffline" substitutionVariables:@{@"ANY_VARIABLE_NAME":offline}];