RestKit - Entity Mapping Property transformation

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];