Mapping JSON key values to Core Data attributes in RestKit 0.20.1

Question

Given this JSON:

{ 
    "company": "Big Inc."
    "products": [
        {
            "category": "",
            "daily_sales": {
                "2013-04-13": 23
                "2013-05-27": 67
                "2013-05-28": 89
            }
        },
        {
            "category": "",
            "daily_sales": {
                "2013-04-13": 23
                "2013-05-27": 67
                "2013-05-28": 89
            }
        },
        ...
    ]
}

I want to flatten it and save it in objects like this:

SALE
- company (string)
- category (string)
- date (date)
- sales (int)

So the JSON example above would generate 6 objects.

How do I configure the mapping in RestKit to include the key (the date) as a mapped value into the new object?

A single object to hold those parts? You can't, because the JSON holds an array, how would you map all the array contents to a single object? Or am I misunderstanding your question? — Wain, May 30 '13 at 06:50
I want to save it de-normalized and one object for each date - "So the JSON example above would generate 6 objects." — thejaz, May 30 '13 at 10:12
RestKit can't do that for you automatically I think. You'd need to either manipulate the data before it is mapped or map the data into another object and then post-process it. — Wain, May 30 '13 at 10:16
Maybe you're right. But it doesn't seem to be a nice way to hook into the mapping chain when using RKObjectManager. You need a RKObjectRequestOperation to be able to set the `willMapDeserializedResponseBlock` block. I guess I need to copy the `getObjectsAtPathForRelationship...` and `getObjectsAtPathForRouteNamed` methods in RKObjectManager to set that block. — thejaz, May 30 '13 at 10:34

score 0 · Accepted Answer · answered May 30 '13 at 12:07

It is not possible to do this with RestKit mapping (as of 0.20.1).

You can modify the response to make it RestKit-friendly. I've made a category on RKObjectManager to easily provide a block to modify the response:

https://gist.github.com/gunnarblom/5677324

Mapping JSON key values to Core Data attributes in RestKit 0.20.1

1 Answers1