CODEWITHSUNDEEP
iphoneiosrestkit
Krzysztof Luks
Krzysztof Luks

Reputation: 300

RestKit: how to make a mapping for varying key names

I'm trying to make a dynamic mapping for a bit weird structured JSON. I have "array mapped to object" sort of thins so that array indices ake keys e.g.:

{
 "0": {object},
 "1": {another object},
 "2": {yet another object},
 ...
}

All objects are of the same type so they can be parsed using the same mapping, but how to deal with varying key names?

Upvotes: 1

Views: 857

Answers (1)

David Kay
David Kay

Reputation: 1000

Check out the section on "Handling Dynamic Nesting Attributes" in the Object Mapping docs.

He walks through an example (copied here) with the JSON:

{ "blake": {
    "email": "[email protected]",
    "favorite_animal": "Monkey"
    }
}

Corresponding to the User class:

@interface User : NSObject
@property (nonatomic, retain) NSString* email
@property (nonatomic, retain) NSString* username;
@property (nonatomic, retain) NSString* favoriteAnimal;
@end

Which, you'll notice, the username property corresponds to the key of the JSON.

In order to map it, he uses a special parenthesis syntax to indicate that they key itself is a property:

RKObjectMapping* mapping = [RKObjectMapping mappingForClass:[User class] ];
[mapping mapKeyOfNestedDictionaryToAttribute:@"username"];
[mapping mapFromKeyPath:@"(username).email" toAttribute:"email"];
[mapping mapFromKeyPath:@"(username).favorite_animal" toAttribute:"favoriteAnimal"];

Hope this helps!

Upvotes: 3

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