RestKit - Entity Mapping Property transformation - objective-c

Question

I need to map a web service with object properties all in caps against coredata object properties all in lowercase:
# JSON
{
'ID': 'value',
'TITLE': 'value',
'BODY': 'value',
}
# CoreData Entity
{
'id': 'value',
'title': 'value',
'body': 'value',
}
I mapped the fields by doing:
RKEntityMapping *entMap = [RKEntityMapping mappingForEntityForName:entName
inManagedObjectStore:managedObjectStore];
NSEntityDescription *entity = [[managedObjectModel entitiesByName]
objectForKey:entName];
[entMap addAttributeMappingsFromArray:[[[RKPropertyInspector sharedInspector]
propertyInspectionForEntity:entity] allKeys]];
I saw this convenient setDefaultSourceToDestinationKeyTransformationBlock fonction in RKObjectMapping allowing to define custom transformation on object properties. This is not available on RKEntityMapping.
How can I do property transformations with RKEntityMapping without defining fields manually ?

Answer 1

Here is my current work-around:
- (NSDictionary *)dictToArray:(NSArray *)array
withTranformation:(NSString *(^)(NSString *))theBlock
{
NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
for (NSString *key in array) {
dict[theBlock(key)] = key;
}
return dict;
}
NSArray *fields = [[[RKPropertyInspector sharedInspector]
propertyInspectionForEntity:entity] allKeys];
NSDictionary *mapDict = [self dictToArray:fields
withTranformation:^NSString *(NSString *str) {
return [str uppercaseString];
}];
[entMap addAttributeMappingsFromDictionary:mapDict];