get relationships from an NSDictionaryResultType

Question

I have a results array containing the fetch results from core data. It is an array of Dictionaries (according to NSDictionaryResultType).

The object I fetch is a car, car has name,make,model,color (which I can see all in the array). However car also has a toCarParts relationship. This NSSet contains carPart objects (wheel, tire, etc...)

How do I access this (is it faulted in the dictionary?)

score 2 · Accepted Answer · answered Jan 10 '13 at 19:51

2

The documentation of - (void)setPropertiesToFetch:(NSArray *)values states:

The property descriptions may represent attributes, to-one relationships, or expressions.

It is therefore not possible to get the NSSet of a to-many relationship with NSDictionaryResultType.

answered Jan 10 '13 at 19:51

Martin R

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so how would you suggest I structure the request to get the managed object with all relationships? but obtain unique objects (no duplicates) – William Falcon Jan 10 '13 at 19:56
@Will: If you have 4 Car objects with identical attributes, which one should the request return? – Martin R Jan 10 '13 at 20:02
any (just need one), its the same car – William Falcon Jan 10 '13 at 20:04
@Will: I can't think of a fetch request which does what you want. It would probably be better to avoid this situation by testing for duplicates before a new Car object is added to the database. – Martin R Jan 10 '13 at 20:12
ok, I thought there weren't duplicates in my parsing but I will check – William Falcon Jan 10 '13 at 20:23

get relationships from an NSDictionaryResultType

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