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POmost effective way of searching using NSPredicate OR statement
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  1. POmost effective way of searching using NSPredicate OR statement
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    copied!<p>I tried to build a predicate in a previous post, but ended up doing it this way because after 3 hours, I couldn't get it to work.</p> <p>I feel like there has to be a more effective way, also I need the predicates to be case insensitive.</p> <p>10,000 cars I have a tire, wheel, seat as three car parts I want to find all cars that have a tire. THEN I want to find all cars that have a wheel. THEN I want to find all cars that have a seat. (I know many will be duplicates, but that's what I need)</p> <p>Please let me know if there is a more effective way. Also please let me know how to make the predicates case insensitive.</p> <p>Thank you in advance!</p> <pre><code>-(NSArray*) loadCarsFromCoreData:(NSMutableArray*)inputCarParts{ NSMutableArray *totalResults=[[NSMutableArray alloc]init]; NSFetchRequest *fetchRequest =[[NSFetchRequest alloc]init]; //To find the cars we are using the car parts NSEntityDescription *entity = [NSEntityDescription entityForName:@"CarParts" inManagedObjectContext:[self managedObjectContext]]; [fetchRequest setEntity:entity]; NSError *error; NSMutableArray *predicates =[self parseCarPartsIntoAPredicateArray:inputCarParts]; for (int i=0; i&lt;[predicates count]; i++) { [fetchRequest setPredicate:[predicates objectAtIndex:i]]; NSArray *records = [[self managedObjectContext] executeFetchRequest:fetchRequest error:&amp;error]; NSLog(@"results = %i",[records count]); [totalResults addObjectsFromArray:records]; } NSLog(@"results = %i",[totalResults count]); return [NSArray arrayWithArray:totalResults]; } -(NSMutableArray*)parseCarPartsIntoAPredicateArray:(NSMutableArray*)inputCarParts{ NSMutableArray *returnArray=[[NSMutableArray alloc]init]; for (int i=0; i&lt;[inputCarParts count]; i++) { NSPredicate *predicate=[NSPredicate predicateWithFormat:@"partName == %@",[inputCarParts objectAtIndex:i]]; [returnArray addObject:predicate]; } return returnArray; } </code></pre>
 

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