Error while fetching data from Core Data - objective-c

Question

I’m working on an dictionary app. this app using core data and I'm very new to core data. In the database, records stored with a single entity called dictionary and dictionary entity has just two attributes “English” & “Meaning”.
So whenever user types some char say a, in UISearchBar, I want to fetch records from data base that starts from “a”, if user types data a than b that I want to fetch records starts from “ab” and so on.
I’m trying same thing by below code:
// Fetch the devices from persistent data store
NSManagedObjectContext *managedObjectContext = [self managedObjectContext];
NSFetchRequest *request = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:ENTITY_NAME inManagedObjectContext:managedObjectContext];
[request setEntity:entity];
// retrive the objects with a given value for a certain property
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"%K beginswith[c] %#",#"English",searchText];
[request setPredicate:predicate];
// Edit the sort key as appropriate.
/*NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:#"English" ascending:YES];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil];
[request setSortDescriptors:sortDescriptors];*/
// Edit the section name key path and cache name if appropriate.
// nil for section name key path means "no sections".
/*NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:request managedObjectContext:managedObjectContext sectionNameKeyPath:nil cacheName:#"Root"];
aFetchedResultsController.delegate = self;*/
NSError *error = nil;
_searchResult = [managedObjectContext executeFetchRequest:request error:&error];
when this code executes my app crashes with the following error msg:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'keypath English not found in entity <NSSQLEntity TamilEnglishDict id=1>'
EDIT:
this is how my Data Model is...
Any who can guide me to the right path of fetching records properly?

Answer 1

Yes it's case sensitive.
So the correct predicate is the following.
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"%K beginswith[c] %#",#"english", searchText];
or just
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"english beginswith[c] %#", searchText];
but while saving those values in managedObject I wrote '[managedObject
setValue:[obj objectForKey:#"English"] forKey:#"English"]';
So now edit your question and explain me the comment above. What do you mean?
Maybe you could just do
[managedObject setValue:[obj objectForKey:#"English"] forKey:#"english"];

Answer 2

I saw your code & your code is correct, you just have to change Predicate you are using. just replace this code with your predicate & hope your problem is solve. because you want result that conatain "ab" or "a" or "b" so you have to use "contain" in place of "beginswith".
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"%K contains[cd] %#",#"English", searchText];
Let me know if you have any issue.