Need some clarification on refreshObject: mergeChanges: YES

A bit of background:

I am trying to store a large amount of data in a local database, and I want to do this as efficiently as possible.

Scenario:

There are many objects that are interconnected, for example, the address is associated with such a contact:

address ↔ contact

To manage relationships, I wrote a method in each subclass of NSManagedObject, the following is a snippet of code:

// class Contact
- (void)manageRelationships
{
    @autoreleasepool {
        LocalDBManager *localDBManager = [[LocalDBManager alloc] init];

        // managing relationships

        // map associated addresses

        NSPredicate *addressIdPredicate = [NSPredicate predicateWithFormat:@"%K == %@",ADDRESSID,self.addressid];

        // below method returns an object as fault by firing a fetch request against context
         NSSet *retrievedAddresses = [localDBManager retrieveManagedObjectsForEntity:ADDR_ENTITY withPredicate:addressIdPredicate asFault:YES withPropertyValues:NO error:nil];
        self.addresses = retrievedAddresses;


        // managing few more relationships         
    }

}

Point to consider:

Since there can be multiple relationships for an object, I know that memory consumption will increase when I compare relationships.

Question:

I want to return the object to fault, without losing any changes, after matching the relationship.

Apple , refreshObject: mergeChanges:. manageRelationships:

[[self managedObjectContext] refreshObject:self mergeChanges:YES];

, -

, , , , ? , NSManagedObjectContext

.