CODEWITHSUNDEEP
iosobjective-ccore-datanspredicate
Gaurav Wadhwani
Gaurav Wadhwani

Reputation: 1352

Compare alphanumeric strings in Core Data

I have a core data attribute titled 'gLotNumber' which stores alphanumeric strings. Examples include P1, P5, 7, P10 and 11.

I need to provide a way to search this attribute to the user. The way I can think of providing this is by using NSPredicate on core data using:

[fetchRequest1 setPredicate:[NSPredicate predicateWithFormat:@"(gLotNumber >= 'P1') AND (gLotNumber <= 'P15')"]];

This should result in all entries which start with P and range between 1 to 15. The above code doesn't produce accurate results at all.

Do you know how this can be achieved?

Upvotes: 0

Views: 215

Answers (1)

Prathamesh Saraf
Prathamesh Saraf

Reputation: 699

I believe this should work

I don't have a coredata setup hence harcoded some array values.

    NSArray *array = @[@{@"gLotNumber":@"P1"},@{@"gLotNumber":@"P15"},@{@"gLotNumber":@"P13"},@{@"gLotNumber":@"P0"},@{@"gLotNumber":@"11"},@{@"gLotNumber":@"10"},@{@"gLotNumber":@"P31"},@{@"gLotNumber":@"P013"},@{@"gLotNumber":@"16"},@{@"gLotNumber":@"P38"}];
    NSArray *filtered = [array filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"SELF.gLotNumber BEGINSWITH 'P' AND SELF.gLotNumber <= 'P15'"]];
    NSSortDescriptor *desc = [NSSortDescriptor sortDescriptorWithKey:@"gLotNumber" ascending:YES comparator:^NSComparisonResult(id obj1,id obj2){
        return [obj1 compare:obj2 options:NSNumericSearch];
    }];
    NSArray *sorted = [filtered sortedArrayUsingDescriptors:@[desc]];

You can set the sort descriptor and predicate to the fetch request Hope this helps

Upvotes: 0

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