NSFetchRequest how to fetch different objects?

Question

I want to fetch a result that doesn't have some same parameter.

like this.

Sample:

Obj1.title= @"1"
Obj2.title= @"3"
Obj3.title= @"3"
Obj4.title= @"3"
Obj5.title= @"4"

Result:

Obj1, Obj2, Obj5

Is it possible in NSFetchRequest?

Joride · Accepted Answer · 2014-01-02 11:48:26Z

1

Yes this can be done by setting the returnDitinctProperties on the fetchRequest:

request.returnsDistinctResults = YES;

For this to work, you also need to set which properties need to be fetched:

request.propertiesToFetch = @[@"title"];

Fore more details, see Apple's documentation: https://developer.apple.com/library/ios/documentation/DataManagement/Conceptual/CoreDataSnippets/Articles/fetchExpressions.html

answered Jan 2, 2014 at 11:48

Joride

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1 Comment

Steven Jiang Over a year ago

It was useful~ Thanks~

iCode · Accepted Answer · 2014-01-02 11:14:39Z

0

You can add all your Objects.title to an NSArray myArray, an then you can add the myArray to an NSSet to have an NSSet with unique titles.

NSSet *uniqueTitles = [NSSet setWithArray:myArray];

answered Jan 2, 2014 at 11:14

iCode

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1 Comment

Steven Jiang Over a year ago

I want to fetch the Obj, not the title.

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