ios - Subclassing a subclass of NSManagedObject -

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I have a NSManagedObject subclass generated directly from my code data, and I have the object in JSN format Class' data from a web service So I need to expand the subclass with some parsing methods. Apart from this, I need to expand the objects by providing some features which I have no interest in the store in the database.

This is currently my code: 

  @interface Customer: NSManagedObject @property (nonatomic, retain) NSNumber * ID; @protecti (nontomic, write) NSString * firstName; @property (nonatomic, retain) NSString * familyName; @end @interface ExtCustomer: Customer @ Property (non-nominal, retaining) NSNM * amendment date; + (Extreme Customer *) Parsezden Data: (NSDT *) JSN data; I do not see examples of managing objects that are derived from a  NSManagedObject  subclass I am doing this way because I have my own custom logic And I like to keep the qualities, which I do not want to be separated from the class generated from the data model, if I have to reproduce the data model, besides, I want to use it in whole app, it is a child, code> ExtCustomer . What is the right or best way to manage the initialization of this subclassic objects? And how should I save them with core data? Just saving them as  customer  items?  
 Thanks in advance   
 
 
 You can use the mogenerator to generate this two squares You can: _Entity and unit you can write methods in your custom variable and ante orbit which pass by _Entity In addition to this, you can automatically set run scripts in the build script to execute the modulator command. See for more information.

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