Restkit: methodSignatureForSelector crashing in RKMappingOperation with EXC_BAD_ACCESS - restkit-0.20

Question

In the file RKMappingOperation there is method
- (NSMethodSignature *)methodSignatureForSelector:(SEL)selector
{
return [self.object methodSignatureForSelector:selector];
}
which triggers exception on iPhone5 but the application continues to run. But on iPhone4S the application crashes with EXC_BAD_ACCESS.
I assume the exception is handled as stated in the documentation:
Raises NSInvalidArgumentException. Override this method in your concrete subclass to return a proper NSMethodSignature object for the given selector and the class your proxy objects stand in for.
The log file:
T restkit.object_mapping:RKMappingOperation.m:862 Performing mapping operation: <RKMappingOperation 0x181e1960> for 'TSNDecimal' object. Mapping values from object 10 to object <TSNDecimal: 0x18004bc0> (entity: TSNDecimal; id: 0x1819dcb0 <x-coredata:///TSNDecimal/t507A4693-CB2E-4194-966A-00BA8AD5CC70391> ;
data: {
number = 0;
responseName = nil;
sortId = 0;
ticket = nil;
}) with object mapping (null)
2014-07-07 13:17:50.194 VZN Mobile[440:8f0f] D restkit.object_mapping:RKPropertyInspector.m:131 Cached property inspection for Class 'TSNDecimal': {
number = {
isPrimitive = 0;
keyValueCodingClass = NSDecimalNumber;
name = number;
};
responseName = {
isPrimitive = 0;
keyValueCodingClass = NSString;
name = responseName;
};
sortId = {
isPrimitive = 0;
keyValueCodingClass = NSNumber;
name = sortId;
};
sortIdValue = {
isPrimitive = 1;
keyValueCodingClass = NSNumber;
name = sortIdValue;
};
ticket = {
isPrimitive = 0;
keyValueCodingClass = TSNTicketApiTO;
name = ticket;
};
}
2014-07-07 13:17:50.194 VZN Mobile[440:9f07] T restkit.object_mapping:RKMappingOperation.m:440 Found transformable value at keyPath '(null)'. Transforming from class '__NSCFNumber' to 'NSDecimalNumber'
2014-07-07 13:17:50.204 VZN Mobile[440:9f07] self.object:10

Answer 1

Thank you Wain for the comment. Actually it was caused by a wrong code in Restkit transforming NSDecimalNumber to NSNumber. There is a method in RKValueTransformers.m:
+ (instancetype)decimalNumberToNumberValueTransformer
{
....
....
RKValueTransformerTestOutputValueClassIsSubclassOfClass(outputValueClass, (#[ [NSNumber class], [NSDecimalNumber class]]), error);
if ([inputValue isKindOfClass:[NSNumber class]]) {
*outputValue = [NSDecimalNumber decimalNumberWithDecimal:[inputValue decimalValue]];
} else if ([inputValue isKindOfClass:[NSDecimalNumber class]]) {
*outputValue = inputValue;
}
return YES;
}];
}
The conditions have to be swapped this way:
if ([inputValue isKindOfClass:[NSDecimalNumber class]]) {
*outputValue = [NSDecimalNumber decimalNumberWithDecimal:[inputValue decimalValue]];
} else if ([inputValue isKindOfClass:[NSNumber class]]) {
*outputValue = inputValue;
}
Then the code is not crashing and it is working as author originally assumed.