How to properly include NSManagedObjects headers?

Question

Objective-C

The application data model contains many entities. Classes have been created for these entities. When you work with objects of these classes in your code, you need to include the header files of these classes. How to connect these headers correctly? How to automate the update of headers when a new class is added? Or would it be more correct to manually include only those classes that are needed in the current controller at the moment?