How to parse this repsonse in restkit? - ios

Question

I am confused completely to parse this kind of response in restkit. I am using this link but i am not able to understand how to parse this response.Any help would be appreciated.
“groups”: {
"group1": [
{
"email": "blake#restkit.org",
"favorite_animal": "Monkey"
},
{
"email": "slake#restkit.org",
"favorite_animal": "Donkey"
}
],
"group2": [
{
"email": "sarah#restkit.org",
"favorite_animal": "Cat"
},
{
"email": "varah#restkit.org",
"favorite_animal": "Cow"
}
]
}
I am Using Below mapping.
#interface GroupResponse : NSObject
#property (nonatomic, strong) NSArray *Groups;
+ (RKObjectMapping *)mapping;
#end
#implementation GroupResponse
+ (RKObjectMapping *)mapping {
RKObjectMapping *objectMapping = [RKObjectMapping mappingForClass:[self class]];
[objectMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:#“groups” toKeyPath:#“Groups” withMapping:[GroupData mapping]]];
return objectMapping;
}
#end
#interface GroupData : NSObject
#property (nonatomic, strong) NSString *groupName;
#property (nonatomic, strong) NSString *arrPersons;
+ (RKObjectMapping *)mapping;
#end
#implementation GroupData
+ (RKObjectMapping *)mapping {
RKObjectMapping *objectMapping = [RKObjectMapping mappingForClass:[self class]];
objectMapping.forceCollectionMapping = YES;
[objectMapping addAttributeMappingFromKeyOfRepresentationToAttribute:#"groupName"];
[objectMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:#“(groupName)” toKeyPath:#"arrPersons" withMapping:[Person mapping]]];
return objectMapping;
}
#end
#interface Person : NSObject
#property (nonatomic, strong) NSString *email;
#property (nonatomic, strong) NSString *favAnimal;
+ (RKObjectMapping *) mapping;
#end
#implementation Person
+ (RKObjectMapping *)mapping {
RKObjectMapping *objectMapping = [RKObjectMapping mappingForClass:[self class]];
[objectMapping addAttributeMappingsFromDictionary:#{#"email" : #"email",
#"favorite_animal" : #"favAnimal"}];
return objectMapping;
}
#end
Everytime arrPersons is nil. How to do proper mapping in this case.

Answer 1

This attribute:
#property (nonatomic, strong) NSString *arrPersons;
should actually be a mutable array, not a string type:
#property (nonatomic, strong) NSMutableArray *arrPersons;
because the nested JSON array can't be converted into a string and your mapping indicates that it should be processed into an array of Person objects.