restkit mapping nested array is empty (nested restkit request with json response) - ios

Question

Am i doing something weired here ?
my categories get downloaded and mapped,
product also get downloaded and mapped as logging is saying,
but my products are empty under each category,
thnx!
{
"productsCategories" : [
{
"product" : [
{
"price" : 3.99,
"title" : "Product A"
},
{
"price" : 3.99,
"title" : "ProductB "
}
],
"categoryTitle" : “a category“
}
]
}
RKObjectMapping *productCategoryMapping = [RKObjectMapping mappingForClass:[ProductCategory class]];
[productCategoryMapping addAttributeMappingsFromDictionary:#{
#"categoryTitle": #"tit"
}];
RKObjectMapping* productMapping = [RKObjectMapping mappingForClass:[Product class] ];
[productMapping addAttributeMappingsFromDictionary:#{
#"title": #"tit",
#"price": #"prc"
}];
[productCategoryMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:#"product"
toKeyPath:#"product"
withMapping:productMapping]];
RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:productCategoryMapping method:RKRequestMethodPOST pathPattern:#"productByCategory" keyPath:#"productsCategories" statusCodes:[NSIndexSet indexSetWithIndex:200]];
NSURL *url=[NSURL URLWithString:#"http://www.example.com/REST/v2/"];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];
RKObjectManager *manager = [RKObjectManager managerWithBaseURL:url];
[manager addResponseDescriptor:responseDescriptor];
NSMutableDictionary *mutableParameters = [NSMutableDictionary dictionary];
[mutableParameters setValue:#"1" forKey:#"id"];
[manager addResponseDescriptor:[RKResponseDescriptor responseDescriptorWithMapping:productCategoryMapping method:RKRequestMethodPOST pathPattern:#"productByCategory" keyPath:#"productsCategories" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)]];
[manager postObject:request path:#"productByCategory" parameters:mutableParameters success:^(RKObjectRequestOperation *operation, RKMappingResult *result){
self.productCategoryArr=result.array;
[self.tblDetails reloadData];
}failure:^(RKObjectRequestOperation *operation, NSError *error) {
RKLogError(#"Operation failed with error: %#", error);
self.productCategoryArr=nil;
}];
the logging says objects are being mapped for each products but I only get
ProductCategory: 0x7bf53510
ProductCategory: 0x7be57f00
arrays and 0 objects in each

Answer 1

Assuming your ProductCategory class has
NSArray *Product
NSString * tit
Create a top level RKObjectMapping like,
RKObjectMapping * ProductCategoryResponseMapping = [RKObjectMapping mappingForClass: [ProductCategoryResponse class]];
[ProductCategoryResponseMapping addAttributeMappingsFromDictionary:#{
#"productsCategories": #"productsCategories"
}];
And create new class ProductCategoryResponse which should have
NSArray * productsCategories
Use ProductCategoryResponseMapping for Response descriptor.
Now your response will have array of productsCategories, each having array of Products and String tit.