I m 开发一个SOS,我可以找到关于新的
我拥有与多个实体B物体有关系的物体。
我想举出所有实体B物体,这些物体符合特定模式,并按实体A分类。 因此,我没有为每个实体A单独设一个银团。 理想的做法是将结果结构化,以便我能够把平等实体的集团 over为一,然后所有实体都将拥有。 Bs 调和模式,从一个单列要求。
我可以看到<代码>Properties TogroupBy:。 方法应当让我按逆向B->进行分类;A关系,并回归一系列的<代码>NSDictionaries。 但是,这是否意味着每个项目在<代码>NSArray上按实体A对应一个组? 相应的<代码>NSManagedObject的子类可在中找到某些地方。 NSDictionary ?
无。 这样做有两个途径:
NSSortDescriptor to sort by B and separate the results in to groups.后者可能较快,因为中间分裂避免了非银的多次准入和单列要求。
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