RestKit dynamic nesting attributes - ios

Question

I'm trying to map an API result that has dynamic nested attributes. The result (json) is I have is this:
{
"url": "https://api.github.com/gists/8901308",
"id": "8901308",
"html_url": "https://gist.github.com/8901308",
"files": {
"node-and-npm-in-30-seconds.sh": {
"filename": "node-and-npm-in-30-seconds.sh",
"type": "application/sh",
"language": "Shell",
"raw_url": "https://gist.github.com/braincrash/8901308/raw/bae861f7c4ab0c1ffd9962439e770b02f52c5dd7/node-and-npm-in-30-seconds.sh",
"size": 352
},
"only-git-all-the-way.sh": {
"filename": "only-git-all-the-way.sh",
"type": "application/sh",
"language": "Shell",
"raw_url": "https://gist.github.com/braincrash/8901308/raw/eba9667b37218ffb41892411c94abd051b0e269a/only-git-all-the-way.sh",
"size": 440
}
}
}
I can get all the attributes, but the files won't work. Here's my mapping:
RKEntityMapping *fileMapping = [RKEntityMapping mappingForEntityForName:#"File" inManagedObjectStore:managedObjectStore];
fileMapping.forceCollectionMapping = YES;
[fileMapping addAttributeMappingFromKeyOfRepresentationToAttribute:#"filename"];
[fileMapping addAttributeMappingsFromDictionary:#{#"(filename).raw_url": #"rawURL",
#"(filename).size": #"size"}];
RKEntityMapping *gistMapping = [RKEntityMapping mappingForEntityForName:#"Gist" inManagedObjectStore:managedObjectStore];
[gistMapping addAttributeMappingsFromDictionary:#{
#"id": #"gistID",
#"url": #"jsonURL",
#"html_url": #"htmlURL"}];
gistMapping.identificationAttributes = #[ #"gistID" ];
[gistMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:#"files" toKeyPath:#"files" withMapping:fileMapping]];
RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:gistMapping method:RKRequestMethodGET pathPattern:#"/gists/public" keyPath:nil statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
When I look at the File inside the Gist object, I only get the filename, but not the url nor size:
filename = "radiation.js";
gist = "0xb9742f0 <x-coredata://D37E442D-45BA-4A0E-B7A5-A349F75FA362/Gist/p21>";
rawURL = nil;
size = 0;
Thanks for the help!!

Answer 1

Your file names contain dots so they will mess up key path navigation.
RestKit does struggle with this a little and I don't think there is currently a solution. Some have been proposed (https://github.com/RestKit/RestKit/pull/1541/files) but I think it remains an open issue.
The problem is how to know whether a dot represents a key path to the traversed or not. In theory it is possible to determine but it isn't necessarily trivial to implement in a framework or performant. You may be able to debug around the usage of RKObjectMappingNestingAttributeKeyName and add a custom solution just for that part.