-[EngineerModel _isNaturallyRTL]: unrecognized selector sent to instance - iphone

Question

Getting this error:
'NSInvalidArgumentException', reason: '-[EngineerModel _isNaturallyRTL]: unrecognized selector sent to instance
I've read How to resolve 'unrecognized selector sent to instance'? and others.
Using Xcode 4.5.1 with arc (my first time with arc)
Here's my code, which is based on an earlier non-arc project which works great
database.m
// Models for data
#import "EngineerModel.h"
- (NSArray *)returnEngineers
{
NSMutableArray *retval = [[NSMutableArray alloc] init];
NSString *query = #"SELECT * FROM engineers";
stmt = nil;
if (sqlite3_prepare_v2(_database, [query UTF8String], -1, &stmt, nil) == SQLITE_OK) {
while (sqlite3_step(stmt) == SQLITE_ROW) {
char *engineerIDChr = (char *) sqlite3_column_text(stmt, 0);
char *engineerNameChr = (char *) sqlite3_column_text(stmt, 1);
char *engineerSigFileChr = (char *) sqlite3_column_text(stmt, 2);
char *engineerPhoneChr = (char *) sqlite3_column_text(stmt, 3);
char *engineerEmailChr = (char *) sqlite3_column_text(stmt, 4);
char *engineerRegNoChr = (char *) sqlite3_column_text(stmt, 5);
NSString *engineerID = [[NSString alloc] initWithUTF8String:engineerIDChr];
NSString *engineerName = [[NSString alloc] initWithUTF8String:engineerNameChr];
NSString *engineerSigFile = [[NSString alloc] initWithUTF8String:engineerSigFileChr];
NSString *engineerPhone = [[NSString alloc] initWithUTF8String:engineerPhoneChr];
NSString *engineerEmail = [[NSString alloc] initWithUTF8String:engineerEmailChr];
NSString *engineerRegNo = [[NSString alloc] initWithUTF8String:engineerRegNoChr];
EngineerModel *info = [[EngineerModel alloc] initWithUniqueId:engineerID
engineerName:engineerName
engineerSigFile:engineerSigFile
engineerPhone:engineerPhone
engineerEmail:engineerEmail
engineerRegNo:engineerRegNo];
[retval addObject:info];
}
sqlite3_finalize(stmt);
}
return retval;
}
Database has two entries
And the model
// EngineerModel.h
#import <Foundation/Foundation.h>
#interface EngineerModel : NSObject
{
NSString *_engineerID;
NSString *_engineerName;
NSString *_engineerSigFile;
NSString *_engineerPhone;
NSString *_engineerEmail;
NSString *_engineerRegNo;
}
#property (nonatomic, copy) NSString *engineerID;
#property (nonatomic, copy) NSString *engineerName;
#property (nonatomic, copy) NSString *engineerSigFile;
#property (nonatomic, copy) NSString *engineerPhone;
#property (nonatomic, copy) NSString *engineerEmail;
#property (nonatomic, copy) NSString *engineerRegNo;
- (id)initWithUniqueId:(NSString *)AengineerID
engineerName:(NSString *)AengineerName
engineerSigFile:(NSString *)AengineerSigFile
engineerPhone:(NSString *)AengineerPhone
engineerEmail:(NSString *)AengineerEmail
engineerRegNo:(NSString *)AengineerRegNo;
- (id) init;
#end
// EngineerModel.m
#import "EngineerModel.h"
#interface EngineerModel ()
#end
#implementation EngineerModel
#synthesize engineerID, engineerName, engineerSigFile, engineerPhone, engineerEmail, engineerRegNo;
- (id)initWithUniqueId:(NSString *)AengineerID
engineerName:(NSString *)AengineerName
engineerSigFile:(NSString *)AengineerSigFile
engineerPhone:(NSString *)AengineerPhone
engineerEmail:(NSString *)AengineerEmail
engineerRegNo:(NSString *)AengineerRegNo
{
if ((self = [super init]))
{
self.engineerID = AengineerID;
self.engineerName = AengineerName;
self.engineerSigFile = AengineerSigFile;
self.engineerPhone = AengineerPhone;
self.engineerEmail = AengineerEmail;
self.engineerRegNo = AengineerRegNo;
}
return self;
}
- (id) init {
self = [super init];
return self;
}
#end
Lastly
I've added -ObjC and -all_load to other linker flags
Added #synthesize (I didn't think I had to for arc?)
If I simplify it down to
- (id)initWithId:(NSString *)AengineerID
{
NSLog(#"AengineerID %#",AengineerID);
if ((self = [super init]))
{
self.engineerID = AengineerID;
}
return self;
}
It traces AengineerID then crashes
Any ideas?

Answer 1

_isNaturallyRTL is a private method on NSString. So somehow you've got an EngineerModel instance where some other code is expecting an NSString.
What do you do with that array of EngineerModel objects you return from the returnEngineers method?
And just as a recommendation... using the sqlite3 C API yourself like that is a lesson in frustration. I highly recommend using something like FMDB instead.