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    <p>I believe you miss one 'level' of your mapping. If you take a closer look at your input, you have an dictionary (key1), which contents is not single '<code>Sendung</code>' but an array of such objects. Thus, you can't map contents of the key1 directly to <code>Sendung</code> ivars, rather than create new class, eg <code>SendungResult</code>.</p> <pre><code>@interface SendungResult : NSObject @property (nonatomic, strong) NSString *keyName; @property (nonatomic, strong) NSArray *sendungs; @end </code></pre> <p>and map the contents of key1 to <code>SendungResult</code> <code>sendungs</code> array using the relationship mapping you use now directly.</p> <p><strong>EDIT:</strong> I'm extending the answer as follows:</p> <p>As i said earlier, you are trying to map a collection of objects into a single instance, so this can not work. Instead, you have to create a <code>SendungResult</code> that will hold an array of <code>Sendung</code> instances for one key. So in your example, you'll end up with two <code>SendungResult</code> instances (one will hold three <code>Sendung</code>s - those nested under <code>"key1"</code> and the second one just two, nested under <code>"key2"</code>). You can't map this kind of a structure into just once class, you have to nest them same way as your JSON is nested. The <code>Sendung</code> class is basically unchanged. </p> <p>Now for the mapping. You need to define two mappings, one will map the contents of your root JSON into two <code>SendungResult</code> (one for each key) and the second mapping will map the inner part into individual <code>Sendung</code> instances.</p> <p>We start with the inner mapping.</p> <pre><code>RKObjectMapping *sendungMapping = [RKObjectMapping mappingForClass:[Sendung class]]; [sendungMapping mapKeyPath:@"desc" toAttribute:@"desc"]; [sendungMapping mapKeyPath:@"duration" toAttribute:@"duration"]; [[[RKObjectManager sharedManager] mappingProvider] addObjectMapping:sendungMapping]; </code></pre> <p>Nothing really interesting here, we just map the keypaths to your properties. Now for the outer part.</p> <pre><code>RKObjectMapping *resultMapping = [RKObjectMapping mappingForClass:[SendungResult class]]; [resultMapping setForceCollectionMapping:YES]; [resultMapping mapKeyOfNestedDictionaryToAttribute:@"keyName"]; [resultMapping mapKeyPath:@"(keyName)" toRelationship:@"sendungs" withMapping:sendungMapping]; [[[RKObjectManager sharedManager] mappingProvider] addObjectMapping:resultMapping]; </code></pre> <p>We tell RestKit to map contents of the keyName keyPath to <code>sendungs</code> property found on <code>SendungResult</code> class with the mapping defined earlier.</p> <p>Now we can fetch the data </p> <pre><code>[[RKObjectManager sharedManager] loadObjectsAtResourcePath:@"test.js" objectMapping:resultMapping delegate:self]; </code></pre> <p>The RestKit will create two <code>SendungResult</code> instances, each array contains the inner <code>Sendung</code> classes (3 and 2, respectively)</p> <p><strong>Note:</strong> I strongly suggest you to read <a href="https://github.com/RestKit/RestKit/blob/master/Docs/Object%20Mapping.md" rel="noreferrer">RestKit Object Mapping</a> documentation. Also, JSONLint found your JSON to be invalid, i had to remove the semicolons. So be sure to use valid json.</p>
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    1. COi tried. here is the code: NSString *url = [[NSString alloc] initWithFormat:@"/sendungen"] ; RKObjectMapping* mapping = [RKObjectMapping mappingForClass:[Sendung class]]; [mapping mapKeyPathsToAttributes: @"desc", @"description", @"duration", @"duration", nil];
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    2. COfor(NSString *key in keys){ RKObjectMapping* generalMapping = [RKObjectMapping mappingForClass:[OIdClass class] ]; [generalMapping mapKeyPath:key toAttribute:@"senders"]; [generalMapping mapKeyPath:key toRelationship:key withMapping:mapping]; [[RKObjectManager sharedManager].mappingProvider setMapping:generalMapping forKeyPath:key]; } [[RKObjectManager sharedManager] loadObjectsAtResourcePath:url delegate:self ]; As you see I have to iterate through my keys then to make each relationship :( Result is with NO errors, but I get empty objects : ()
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    3. COi don't quite follow why you have to iterate over you keys. Please refer to my another answer - http://stackoverflow.com/questions/7726437/restkit-how-does-one-post-an-array-of-objects/7726829#7726829 Note: that answer deals with posting an array of objets, but the same steps applies here, you just don't need to send the [mapping inverseMapping] selector.
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