NSPredicate for simple fetchRequest - ios

Question

I am using Core Data to save previous searches in a SearchBar. My entity is very simple, it just has the property:
previousSearch (NSString)
When the user types in the search bar, I want to search the database for my previous search. I keep getting 0 results though.
Here is the code that retrieves the data from Core Data.
- (void)filterContentForSearchText:(NSString *)searchText {
[self.filteredLastSearches removeAllObjects];
NSEntityDescription *search = [NSEntityDescription entityForName:#"Search" inManagedObjectContext:_managedObjectContext];
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
[fetchRequest setEntity:search];
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"previousSearch=[c]%#", searchText];
[fetchRequest setPredicate:predicate];
NSError *error = nil;
NSArray *fetchedObjects = [_managedObjectContext executeFetchRequest:fetchRequest error:&error];
if (error) {
NSLog(#"Error filtering search: %#", [error description]);
}
_filteredLastSearches = [NSMutableArray arrayWithArray:fetchedObjects];
}
fetchedObjects is always empty and I'm not sure why. I can see in the database that the db actually has the ZPREVIOUSSEARCH with a couple values that I've tried to show while searching, but it's always empty. Is there something I'm missing? Thanks in advance.

Answer 1

I'm not sure if = operator work with [c]. Try to use like instead:
[NSPredicate predicateWithFormat:#"previousSearch like[c] %#", searchText];
Also you may want to search not equal results but results that contains (or begins with) your text. In this case you may use contains or beginswith.
[NSPredicate predicateWithFormat:#"previousSearch contains[c] %#", searchText];
[NSPredicate predicateWithFormat:#"previousSearch beginswith[c] %#", searchText];