I'm looking to get all of my Foursquare Lists into Core Data. I'd like to use Restkit to accomplish this. The structure of the /v2/users/self/lists response is:
"response": {
"lists": {
"count": 8,
"groups": [
{
"type": "created",
"name": "Lists You've Created",
"count": 6,
"items": [
{
"id": "13250/todos",
"name": "My to-do list", ...
}
{
"id": "13251/something",
"name": "Some List", ...
},
{
"id": "13252/somethingelse",
"name": "Some Other List", ...
}
]
},
{
"type": "followed",
"name": "Lists You've Saved",
"count": 1,
"items": [
{
"id": "5105e3cae4b0e721ca7b400a",
"name": "Portland's Best Coffee - 2012", ...
}
{
...
}
]
}
]
}
As you can see there are 2 lists under the keyPath response.lists.groups. Ultimately I'd like to merge those 2 lists into 1, but I'd be happy with getting 2 separate lists.
I've set up my mappings as follows:
RKEntityMapping* listMapping = [RKEntityMapping mappingForEntityForName:[FOFSList entityName]
inManagedObjectStore:objectManager.managedObjectStore];
[listMapping addAttributeMappingsFromDictionary:@{
@"id": @"listID",
@"title": @"name",
@"description": @"desc",
@"user": @"user",
@"following": @"following",
@"collaborative": @"collaborative",
@"canonicalUrl": @"canonicalUrl",
@"venueCount": @"venueCount",
@"visitedCount": @"visitedCount"
}];
RKDynamicMapping *dynamicMapping = [RKDynamicMapping new];
[listMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:nil
toKeyPath:@"items"
withMapping:dynamicMapping]];
RKResponseDescriptor *listResponseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:listMapping
method:RKRequestMethodGET
pathPattern:nil
keyPath:@"response.lists.groups"
statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[objectManager addResponseDescriptor:listResponseDescriptor];
[dynamicMapping setObjectMappingForRepresentationBlock:^RKObjectMapping *(id representation) {
if ([[representation valueForKey:@"type"] isEqualToString:@"created"]) {
return listMapping;
} else if ([[representation valueForKey:@"type"] isEqualToString:@"followed"]) {
return listMapping;
}
return nil;
}];
listMapping.identificationAttributes = @[ @"listID" ];
I end up with an error:
* Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[ valueForUndefinedKey:]: this class is not key value coding-compliant for the key propertyMappings.'
Am I supposed to be using RKDynamicMappings? Is there some trick that I'm missing for parsing a response that is styled like this?
For those that are interested, I got a little bit creative with the RKResponseDescriptor
RKResponseDescriptor *listResponseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:listMapping
method:RKRequestMethodGET
pathPattern:nil
keyPath:@"[email protected]"
statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
See the collection operation @distinctUinionOfArrays
was ultimately what got me what I needed. It makes a union of the 2 groups arrays, then I grab the items key from each of the objects in the union of the arrays.