[英]Best practice for core data model object save
I have a two entity "Person" and "Car" is coming from the web service. 我有两个实体“人”和“汽车”来自网络服务。 I need to store that in sqlite through core data.
我需要通过核心数据将其存储在sqlite中。 I want to know what is the best approach should i bind the save method with NSmanagedobject or write differently in utility or manager?
我想知道最好的方法是将save方法与NSmanagedobject绑定,还是在实用程序或管理器中编写不同的方法?
**Approach 1**
@interface Person : NSManagedObject
@property (nonatomic, retain) NSString * title;
- (void) saveManagedObject:(NSDictionary*)response //Responsible for init the person object and save in context
@end
**Approach 2**
@interface CoreDataUtility : NSObject
- (void) saveManagedObject:(NSDictionary*)response //Responsible for create the person object and save in context
@end
Short answer: both methods are good, especially if you do not want to deal with 3rd party frameworks. 简短的答案:两种方法都是好的,特别是如果您不想使用第三者框架。 Those might be useful, but the also bear some risks;
这些可能有用,但也要承担一些风险。 this would be another question.
这将是另一个问题。
It is perfectly fine to have a creation method in the `NSManagedObject´ subclass (in a category or elsewhere*). 在“ NSManagedObject”子类(类别或其他地方*)中具有创建方法是完全可以的。
However, you should make it a class method, not an instance method. 但是,应将其设置为类方法,而不是实例方法。
To create an entity in a DataManager
class is also a feasible and a very common pattern. 在
DataManager
类中创建实体也是一种可行且非常常见的模式。 The good thing about the utility class is that you can more easily maintain multiple contexts for background operations. 关于实用程序类的好处是,您可以更轻松地维护后台操作的多个上下文。
*) I do not use categories any more because it is rare to change the model by more than a few fields- I prefer to edit them manually. *) 我不再使用类别,因为很少会通过多个字段来更改模型-我更喜欢手动编辑它们。
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