objective c - Core Data NSFetchRequest for Specific Relationship? -

I am converting an existing data model which was previously stored in core data in XML, so I try to learn I am doing the ropes as far as possible as the core data is clearly one of the techniques that is never going anywhere, so I can also "learn this right". Take a core data model with two entities, for example:

1. person
2. Food < One-to-many relationship with

   person 2 food

   1. Favored Foods (1-to-many)
   2. Foods with hate (1-to-many)

      (Both person and food are both sub-nsmainage objects I can say Arth should have:

        person * Fred = [[individual light] init]; NSArray * fredsFavorites = fred.favoriteFoods;   
       Easy data  
       I am reading through the documentation for core data, and I can not find the correct way to get this NSArray  NSFetchRequest , because  which relationships I have I want to get it from the object, can not define it.   
        NSFetchRequest * request = [[NSFetchRequest alloc] init]; [Request Set Entity: [NSTTTDCification Unit FERN: @ManagedObjectContext @ "Food": [Fred Managed Object Contex]]]; [RequestIncludesSubentities: No]; NSArray * FredsFavoriteAndHatFoods = [[Fred managed object contaxes] executeFetchRequest: request error: zero]; << Code>  
       Returns all  Food  items stored in both  custom food  and  hatedFoods . How can I divide them? Definitely a simple explanation, but now I am not able to understand this concept so that it can be explained in core data chunks, thus my Google search is useless.   
       
       
       The easiest way to achieve this is to directly access  NSSet  :  
        NSArray * fredsFavorites = [fred. Favorite all objects];   
       (How I have received the  NSSr  to  NSArray  as a result)  
       Alternatively, if you establish untrue relationships (which you should do), then you can use a fetch request like this:  
        NSFetchRequest * Request = [[NSFetchRequest alloc] init]; [Request Set Entity: [NSTTTDCification Unit FERN: @ManagedObjectContext @ "Food": [Fred Managed Object Contex]]]; [Acknowledgment of the request: [NSPredicate predicateWithFormat: @ "Anyone with this effacephrat ==% @", Fred]]; NSArray * fredsFavoriteFoods = [[Fred managed object contaxes] executeFetchRequest: request error: zero];   
       It assumes that  peoplewiththeAsFavorite   has an inverse relationship with the favorite  unless I am not reading your example wrong,  Favorite Food  There should be many relationships in fact, because one person can have many favorite foods, and there may be a favorite person with such people in the food.  
       (Note that I did not test it, so  NSPredicate  can not be 100% correct)