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POHow to add mapping between not embedded JSON objects and relationships using RestKit 0.2 and Core Data?
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  1. POHow to add mapping between not embedded JSON objects and relationships using RestKit 0.2 and Core Data?
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    copied!<p>I'm developing my first iOS application that uses RestKit 0.2 and Core Data. Most of the time I have followed this great tutorial <a href="http://www.alexedge.co.uk/blog/2013/03/08/introduction-restkit-0-20/" rel="nofollow noreferrer">http://www.alexedge.co.uk/blog/2013/03/08/introduction-restkit-0-20/</a> however it doesn't fit my requirements since it describes embedded JSON objects and I need to create separate objects. Here is a simplified scenario of my app structure:</p> <p><strong>JSON response:</strong></p> <pre><code>"application": [ { "appId": "148", "appName": … . . . (more attributes) } ], "image": [ { "imgId": "308", "appId": "148", "iType": "screenshot", "iPath": .. . . . }, { "imgId": "307", "appId": "148", "iType": "logo", "iPath": … . . . } ] </code></pre> <p>I have created a data model that contains two entities and set the relationship between them in a way that one application may have more than one image and one image may only belong to one application:</p> <p><img src="https://i.stack.imgur.com/hO1ab.png" alt="enter image description here"></p> <p>I have used mogenerator to create classes represented by entities.</p> <p>I can successfully map the entity to Application object using the following code:</p> <pre><code>NSDictionary *parentObjectMapping = @{ @"appId" : @"appId" }; // Map the Application object RKEntityMapping *applicationMapping = [RKEntityMapping mappingForEntityForName:NSStringFromClass([Application class]) inManagedObjectStore:managedObjectStore]; applicationMapping.identificationAttributes = @[ @"appId" ]; [applicationMapping addAttributeMappingsFromDictionary:@{ @"appName" : @"name", @"appCat" : @"category", @"appType" : @"type", @"compName" : @"companyName", @"compWeb" : @"companyWebsite", @"dLink" : @"downloadWebLink", @"packageName" : @"appStoreLink", @"osMinVer" : @"minRequirements", @"appCost" : @"cost", @"appDescription" : @"appDescription" }]; [applicationMapping addAttributeMappingsFromDictionary:parentObjectMapping]; // Register our mappings with the provider [manager addResponseDescriptorsFromArray:@[ [RKResponseDescriptor responseDescriptorWithMapping:applicationMapping pathPattern:nil keyPath:@"application" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)] ]]; </code></pre> <p>Now I have a problem when mapping the JSON to the image object with the appropriate relationship between Image and Application. How can I add the mapping between the two Entities? Is my data model correct or I'm missing something?</p>
 

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