Objective-c: Use predicate with an object - objective-c

Question

I have a search bar for my table view and until now I used a predicate to check if the data array contains the search bar value. But now there are objects in my data array and now I don't know how to use the predicate. Here is my code:
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"SELF contains [cd] %#", self.controller.searchBar.text];
NSMutableArray *temp = [[NSMutableArray alloc] init];
for (int i = 0; i < [self.data count]; i++) {
Student *student = [[Student alloc] initWithIdentifier:[[self.data objectAtIndex:self.tableView.indexPathForSelectedRow.row] objectForKey:#"id"] name:[[self.data objectAtIndex:self.tableView.indexPathForSelectedRow.row] objectForKey:#"name"] is_public:[[self.data objectAtIndex:self.tableView.indexPathForSelectedRow.row] objectForKey:#"is_public"] password:[[self.data objectAtIndex:self.tableView.indexPathForSelectedRow.row] objectForKey:#"passwort"]];
[temp addObject:student];
}
self.results = [temp filteredArrayUsingPredicate:predicate];
Now it compares the search bar value with the object. But it should compare the search bar value with object.name. How can I do this?
EDIT:
The Student code:
#implementation Student
- (id)initWithIdentifier:(NSString *)identifier name:(NSString *)name is_public:(NSString *)is_public password:(NSString *)password {
self= [super init];
if( self ) {
self.identifier = identifier;
self.name = name;
self.is_public = is_public;
self.password = password;
}
return self;
}
- (NSDictionary*)writableRepresentation {
NSMutableDictionary *writableRepresentation= [NSMutableDictionary dictionaryWithCapacity:4];
[writableRepresentation setValue:self.identifier forKey:#"Identifier"];
[writableRepresentation setValue:self.name forKey:#"Name"];
[writableRepresentation setValue:self.is_public forKey:#"is_public"];
[writableRepresentation setValue:self.password forKey:#"password"];
return writableRepresentation;
}
+ (Student*)studentFromDictionary:(NSDictionary*)dictionaryRepresentation {
return [[Tipprunde alloc] initWithIdentifier:[dictionaryRepresentation valueForKey:#"Identifier"] name:[dictionaryRepresentation valueForKey:#"Name"] is_public:[dictionaryRepresentation valueForKey:#"is_public"] password:[dictionaryRepresentation valueForKey:#"password"]];
}
#end
It don't seem to work with SELF.name. I get the following error:
-[Student objectForKey:]: unrecognized selector sent to instance...