RestKit: mapping JSON array of strings

Question

Given the following JSON:

{
   \"someKey\":\"someValue\",
   \"otherKey\":\"otherValue\",
   \"features\":[
      \"feature1\",
      \"feature2\",
      \"f         


        

Answer 1

You need to use a nil key path:

RKEntityMapping *featureMapping = [RKEntityMapping mappingForEntityForName:...];
[featureMapping addPropertyMapping:[RKAttributeMapping attributeMappingFromKeyPath:nil toKeyPath:@"name"]];
featureMapping.identificationAttributes = @[ @"name" ];

Then, on your top level object mapping, define the relationship:

[topMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"features" toKeyPath:@"features" withMapping:featureMapping]];

In your feature (in the model), myTopLevelObject should be defined as a bi-directional relationship to the top level object.

Answer 2

I don't think you can map an array of strings into a ManagedObject like that. However, since Feature only has one name property you could just store it as an array into your MyTopLevelObject. You can do that by adding a features property to MyTopLevelObject in your datamodel with the type Transformable. RestKit will automatically parse the features a NSArray with NSStrings. You can then get the features as following:

MyTopLevelObject *topLevelObject = ... // get the object from the persistent store
NSArray *features = (NSArray*)topLevelObject.features; // this will contain the features as NSString objects

Answer 3

If you are using Restkit 0.20+ then all you need to do is set the property that is representing the string array of your entity to Transformable.

For example, in this case your Feature entity has 3 properties:

someKey - String
otherKey - String
features - Transformable

Restkit will automatically map 'features' as a string array.

So once mapped, to access one of the strings in the features array would be as simple as:

[Feature.features objectAtIndex:?]

I just tried it and it works perfect.