RestKit simple JSON, bad pathPAttern?

Question

JSONs:

• http://krzysztofkurzawa.com/articles/
• http://krzysztofkurzawa.com/articles/1

Code:

NSURL *baseURL = [NSURL URLWithString:@"http://www.krzysztofkurzawa.com"];
RKObjectManager *objectManager = [RKObjectManager managerWithBaseURL:baseURL];

RKLogConfigureByName("RestKit/Network", RKLogLevelTrace);
RKLogConfigureByName("RestKit/ObjectMapping", RKLogLevelTrace);

RKObjectMapping *mapping = [RKObjectMapping mappingForClass:[NSMutableDictionary class]];
[mapping addAttributeMappingsFromArray:@[@"title"]];

RKResponseDescriptor *rk = [RKResponseDescriptor responseDescriptorWithMapping:mapping pathPattern:@"articles" keyPath:@"articles" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[objectManager addResponseDescriptor:rk];

RKObjectMapping *mapping2 = [RKObjectMapping mappingForClass:[NSMutableDictionary class]];
[mapping addAttributeMappingsFromArray:@[@"title"]];

RKResponseDescriptor *rk2 = [RKResponseDescriptor responseDescriptorWithMapping:mapping2 pathPattern:@"articles/:id" keyPath:nil statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[objectManager addResponseDescriptor:rk2];


[[RKObjectManager sharedManager] getObjectsAtPath:@"articles" parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
    NSLog(@"%@", [mappingResult firstObject]);
} failure:^(RKObjectRequestOperation *operation, NSError *error) {

}];

[[RKObjectManager sharedManager] getObjectsAtPath:@"articles/1" parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
    NSLog(@"%@", [mappingResult firstObject]);
} failure:^(RKObjectRequestOperation *operation, NSError *error) {

}];

Error: No mappable object representations were found at the key paths searched.", keyPath=null, NSLocalizedDescription=No response descriptors match the response loaded.}

I haven't got any ideas. The first mapping works, when pathPattern is set to nil. Why must it be nil? Maybe it is needed for creating rest path patterns.

Answer 1

Your paths were not correct, also, when running your code I had to use the method:

+ (instancetype)responseDescriptorWithMapping:(RKMapping *)mapping
                                       method:(RKRequestMethod)method
                                  pathPattern:(NSString *)pathPattern
                                      keyPath:(NSString *)keyPath
                                  statusCodes:(NSIndexSet *)statusCodes

The one you are using it says it's deprecated. I guess you might be using an old version of restkit.

Here is the code that works:

NSURL *baseURL = [NSURL URLWithString:@"http://www.krzysztofkurzawa.com"];
RKObjectManager *objectManager = [RKObjectManager managerWithBaseURL:baseURL];

RKLogConfigureByName("RestKit/Network", RKLogLevelTrace);
RKLogConfigureByName("RestKit/ObjectMapping", RKLogLevelTrace);

RKObjectMapping *mapping = [RKObjectMapping mappingForClass:[NSMutableDictionary class]];
[mapping addAttributeMappingsFromArray:@[@"title"]];

RKResponseDescriptor *rk = [RKResponseDescriptor responseDescriptorWithMapping:mapping method:RKRequestMethodGET pathPattern:@"/articles/" keyPath:@"articles" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[objectManager addResponseDescriptor:rk];

RKObjectMapping *mapping2 = [RKObjectMapping mappingForClass:[NSMutableDictionary class]];
[mapping2 addAttributeMappingsFromArray:@[@"title"]];

RKResponseDescriptor *rk2 = [RKResponseDescriptor responseDescriptorWithMapping:mapping2  method:RKRequestMethodGET pathPattern:@"/articles/:id/" keyPath:nil statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[objectManager addResponseDescriptor:rk2];


[[RKObjectManager sharedManager] getObjectsAtPath:@"/articles/" parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
    NSLog(@"%@", [mappingResult firstObject]);
} failure:^(RKObjectRequestOperation *operation, NSError *error) {

}];

[[RKObjectManager sharedManager] getObjectsAtPath:@"/articles/1/" parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
    NSLog(@"%@", [mappingResult firstObject]);
} failure:^(RKObjectRequestOperation *operation, NSError *error) {

}];