RestKit - Map keypath of an array to the object inside of that array

Question

I really stack up parsing this particular response with RestKit 0.20:

"addons": [
    {
        "id": 1,
        "name": "Addon one",
        "version": 2
    },
    {
        "id": 2,
        "name": "Addon two",
        "version": 3
    }
],
"forms": [
    {
        "id": 1,
        "name": "Form one",
        "version": 1
    }
]

The problem is that I need to translate the response to an array of object of the same class, such as

@interface MyCoreDataObject : NSManagedObject

@property (nonatomic, retain) NSString * uid;
@property (nonatomic, retain) NSNumber * version;
@property (nonatomic, retain) NSString * name;
@property (nonatomic, retain) NSString * type;

@end

Given that, the key for the array of object should map to the type property and as the result for the response above the mapped result should be look like an array of objects (and table in the database):

uid     name            version     type
1       Addon one       2           addons
2       Addon two       3           addons
1       Form one        1           forms

This is also important, that ID and Type are used as an identity attribute, so I cannot set the type value after mapping is completed, because in this case the RestKit will not be able to find the object that already in the DB and create another one instead of updating that existing one.

Does it possible to solve that problem?

Thank everyone for the answer!

P.S.: During my struggling I found some ways to do it, like creating an object for particular type (for addon, for form and so on), or set type after the mapping is done, but it seams to be really heavy solutions for that simple problem.

Wain · Accepted Answer · 2014-08-06T14:33:46.213

3

I'd have to say that you should create your own JSON serialisation class and register it. You class will deserialise as normal but then check and mutate the result to decompose the type information.

Original answer that ignored the array problem:

You need to use addAttributeMappingFromKeyOfRepresentationToAttribute: which allows you to extract that key and use it as a value.

edited Aug 06 '14 at 14:33

answered Aug 06 '14 at 08:29

Wain

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Thanks for the answer. Yeah, I know that method, it is really cool if you have a key and an object inside it, but I have an array inside. Do you know how to solve it with an array inside? [Here is an example](https://www.dropbox.com/s/9cgmgw7l3i0qtti/Screenshot%202014-08-06%2011.08.41.png) – Andrew Slabko Aug 06 '14 at 09:09
Ah, the inner array. Yes, that's a problem :-S I can't think of a superbly clean way to do it, especially if the type is part of your unique identifiers. – Wain Aug 06 '14 at 14:32
Cool! That definitely should work. Like the idea! So it seams that restkit is not able to solve the problem with usual mapping configurations? – Andrew Slabko Aug 06 '14 at 15:24
1

Not in this case. Indexing into arrays presents problems on a few occasions, like trying to index into 2 arrays in 1 mapping can't be done either... – Wain Aug 06 '14 at 15:27

RestKit - Map keypath of an array to the object inside of that array

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