Multidimensional NSArray not mapped

[schurtertom]

I have now searched quite a long time but did not find a solution to the following problem:

I would like to map with RestKit my JSON response.
In general this is working but, if I have a multidimensional array with custom Objects the mapping does not work.

this is my JSON structure (this can not be changed):

{"myItems":
    {
        "dataSets": ["current objects"],["past objects"]
        "objectList":[
            [
                {"type":114,"objectId":"Objekt 0","measurement":1277962138,"objectName":"est suspendisse maecenas","street":"lectus cursus in","zipCode":"vitae","city":"primis","period":""},
                {"type":110,"objectId":"Objekt 1","measurement":956814287,"objectName":"quam orci nibh","street":"vel nonummy nec","zipCode":"cursus","city":"pede","period":""}
             ],
             [
                {"type":181,"objectId":"Objekt 2","measurement":1378930412,"objectName":"augue fermentum non","street":"odio arcu vitae","zipCode":"quam","city":"placerat","period":""}
             ]
         ]
     }
}

My mapping looks like this:

@implementation MyItems
- (RKObjectMapping *) getFieldMappings
{
    // setup object mappings
    RKObjectMapping *venueMapping = [RKObjectMapping mappingForClass:[MyItems class]];
    [venueMapping addAttributeMappingsFromDictionary:@{@"dataSets" : @"dataSets"}];
    
     // this is not working...
     RKObjectMapping *newsMapping = [[[ObjectList alloc] init] getFieldMappings];
    [venueMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"objectList" toKeyPath:@"objectList" withMapping:newsMapping]];

    return venueMapping;
}
@end

This is my Object Class

@implementation ObjectList
- (RKObjectMapping *) getFieldMappings
{
    RKObjectMapping *venueMapping = [RKObjectMapping mappingForClass:[ObjectList class]];
    [venueMapping addAttributeMappingsFromDictionary:@{@"type" : @"type", @"objectId" : @"objectId", @"objectName" : @"objectName", @"measurement" : @"measurement", @"street" : @"street", @"zipCode" : @"zipCode", @"city" : @"city", @"period" : @"period"}];

    return venueMapping;
}
@end

For some reason, I have a second JSON call which is working absolutely fine.
Here is the one that works, only difference is that this second call does not contain custom objects just NSInteger...

// this works perfectly fine!!! The consumption is parsed correctly
@implementation ObjectConsumption
- (RKObjectMapping *) getFieldMappings
{
    RKObjectMapping *venueMapping = [RKObjectMapping mappingForClass:[ObjectConsumption class]];
    [venueMapping addAttributeMappingsFromDictionary:@{@"unit" : @"unit", @"xLabels" : @"xLabels", @"dataSets" : @"dataSets", @"values" : @"values"}];

    return venueMapping;
}
@end

and here is the JSON for the consumption:

{
    "barChartData":{
        "unit":"CHF",
        "dataSets":[["2016 (1)","2016 (2)","2016 (3)","2016 (4)","2016 (5)","2016 (6)","2016 (7)","2016 (8)","2016 (9)","2016 (10)","2016 (11)","2016 (12)"]],
        "values":[[[237,83,249,-258],[151,124,89,-276],[137,134,111,-202],[174,71,79,-265],[117,176,255,-256],[56,166,69,-233],[243,238,185,-136],[56,39,224,-66],[142,130,223,-37],[229,230,177,-179],[249,83,247,-256],[179,292,181,-275]]],
        "xLabels":["Q1","Q2","Q3","Q4","Q5","Q6","Q7","Q8","Q9","Q10","Q11","Q12"]
    },
    "reportType":1
}