Mantle - Mapping Nested Data Structure - ios

Question

I have a slightly complex nested JSON object that I need to map to Objective-C class. One think I need to do is skip levels in JSON when mapping. Here is what I mean:
I want to map the following JSON Dictionary:
NSDictionary *JSONDictionary = #{
#"status" : #"PASSWORD_EXPIRED",
#"_embedded" : #{
#"user" : #{
#"id" : #"00ub0oNGTSWTBKOLGLNR",
#"profile" : #{
#"login" : #"isaac#example.org",
#"firstName" : #"Isaac",
#"lastName" : #"Brock",
#"locale" : #"en_US",
#"timeZone" : #"America/Los_Angeles"
}
}
}
};
to
#interface Authentication : MTLModel <MTLJSONSerializing>
#property (strong, nonatomic) NSDate* expiresAt;
#property (strong, nonatomic) NSString* status;
#property (strong, nonatomic) NSString* relayState;
#property (strong, nonatomic) NSString* sessionToken;
#property (strong, nonatomic) NSString* stateToken;
//Embeded Resources
#property (strong, nonatomic) User* user;
#end
As you can see I am not creating an object for "_embeded". I am skipping it and mapping user to a User object.
Can this be achieved? If so How?
I have tried this in the implementation but it did not work:
#implementation Authentication
+ (NSDictionary*)JSONKeyPathsByPropertyKey {
return #{
#"expiresAt" : #"expiresAt",
#"status" : #"status",
#"sessionToken" : #"sessionToken",
#"stateToken" : #"stateToken",
#"relayState" : #"relayState",
#"user" : #"_embeded/user",
};
}
+ (NSValueTransformer *)userJSONTransformer {
return [NSValueTransformer mtl_JSONDictionaryTransformerWithModelClass:User.class];
}
#end

Answer 1

I used to do it with the following code:
+ (NSValueTransformer *)userJSONTransformer {
return [MTLValueTransformer reversibleTransformerWithForwardBlock:^id(NSDictionary *userDict) {
return [MTLJSONAdapter modelOfClass:[User class] fromJSONDictionary:userDict error:nil];
} reverseBlock:^id(User *user) {
return [MTLJSONAdapter JSONDictionaryFromModel:user];
}];
}
And also in +JSONKeyPathsByPropertyKey I think it should be #"user" : #"_embeded.user"