Mantle: Ignore Keys in Nested Dictionaries inside an array - ios

Question

I am using the Mantle framework in iOS for a simple JSON structure that looks like this:
{
"posts":
[
{
"postId": "123",
"title": "Travel plans",
"location": "Europe"
},
{
"postId": "456",
"title": "Vacation Photos",
"location": "Asia"
}
],
"updates": [
{
"friendId": "ABC123"
}
]
}
Essentially I am only interested in the "posts" key and wish to completely ignore the "updates" key. Additionally within the "posts" array I wish to completely ignore the "location" key. Here is how I set up my Mantle Models:
#interface MantlePost: MTLModel <MTLJSONSerializing>
#property (nonatomic, strong) NSString *postId;
#property (nonatomic, strong) NSString *title;
#end
#implementation MantlePost
+ (NSDictionary *)JSONKeyPathsByPropertyKey {
return #{
#"postId": #"postId",
#"title": #"title",
};
}
#end
And here is my MantlePosts model:
#interface MantlePosts: MTLModel<MTLJSONSerializing>
#property (nonatomic, strong) NSArray<MantlePost *> *posts;
#end
#implementation MantlePosts
+ (NSDictionary *)JSONKeyPathsByPropertyKey {
return #{
#"posts": #"posts"
};
}
+ (NSValueTransformer *)listOfPosts {
return [MTLJSONAdapter arrayTransformerWithModelClass:MantlePost.class];
}
#end
Finally, here is how I load my JSON up to be converted:
- (NSDictionary *)loadJSONFromFile {
NSString *jsonPath = [[NSBundle mainBundle] pathForResource:#"parse-response" ofType:#"json"];
NSError *error = nil;
NSData *jsonData = [[NSString stringWithContentsOfFile:jsonPath usedEncoding:nil error:&error] dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableLeaves error:&error];
return jsonDict;
}
NSError = nil;
NSDictionary *jsonData = [self loadJSONFromFile];
MantlePosts *posts = (MantlePosts *)[MTLJSONAdapter modelOfClass:MantlePosts.class fromJSONDictionary:jsonData error:&error];
The problem is, my descendent array of MantlePosts contains all 3 properties postId, title, and location, when I explicitly mapped only postId and title. The "updates" array is ignored which is what I wanted but I've been stuck being able to ignore certain keys in the descendent arrays. Any help on this would be appreciated.
Here is an example of what I receive when i po the response in the console.
(lldb) po posts
<MantlePosts: 0x6000000153c0> {
posts = (
{
location = Europe;
postId = 123;
title = "Travel plans";
},
{
location = Asia;
postId = 456;
title = "Vacation Photos";
}
);
}
(lldb)