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PORestKit: How does one post an array of objects?
 

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  1. PORestKit: How does one post an array of objects?
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    <p><strong>Question summary:</strong></p> <p>Consider a class <code>SyncObject</code> that is KVC-compliant with properties such as: <code>time</code>, <code>someValue</code>, <code>lastChange</code>, <code>uuid</code>.</p> <p>Consider an <code>NSArray</code> containing exclusively instances of <code>SyncObject</code>.</p> <p>I need to submit the array to the server as a JSON array.</p> <p>How would one submit this array to the server using HTTP POST using RestKit?</p> <p>Example array:</p> <pre><code>[ { "time": "14:45 10/21/2011", "someValue": "15", "lastChange": "14:45 10/21/2011", "uuid": "0b07c510-f4c8-11e0-be50-0800200c9a66" }, { "time": "14:50 10/21/2011", "someValue": "62", "lastChange": "14:51 10/21/2011", "uuid": "1a6d4480-f4c8-11e0-be50-0800200c9a66" } ] </code></pre> <hr> <p><strong>Details</strong></p> <p>I have an array of objects that I need to the server as JSON. It seems to me that RestKit is the easiest way to do this: I'm trying to avoid converting objects into a set of <code>NSDictionary</code> objects, and then using some JSON encoder to get JSON which I can <code>POST</code> to the server.</p> <p>So, having created the array, and having set up the mapping for the class of objects stored in the array, I naturally try to <code>POST</code> to the server.</p> <pre><code>RKObjectManager* mgr = [RKObjectManager objectManagerWithBaseURL:@"http://localhost/someweb/api/"]; mgr.serializationMIMEType = RKMIMETypeFormURLEncoded; mgr.client.username = @"username"; mgr.client.password = @"password"; RKObjectMapping* mapping = [RKObjectMapping mappingForClass:[NSMutableDictionary class]]; [mapping mapKeyPath: @"time" toAttribute:@"time" ]; [mapping mapKeyPath: @"someValue" toAttribute:@"someValue" ]; [mapping mapKeyPath: @"lastChange" toAttribute:@"lastChange" ]; [mapping mapKeyPath: @"uuid" toAttribute:@"uuid" ]; RKObjectMapping* mappingForSerialization = [mapping inverseMapping]; [mgr.mappingProvider setSerializationMapping:mappingForSerialization forClass:[NSManagedObject class]]; [mgr.router routeClass:[NSManagedObject class] toResourcePath:@"/sync" forMethod:RKRequestMethodPOST]; [mgr postObject:array delegate:nil/*self*/]; </code></pre> <p>However, this is what I get out:</p> <pre> 2011-10-11 14:57:51.769 AppConnect[1974:6e0b] *** Terminating app due to uncaught exception '(null)', reason: 'Unable to find a routable path for object of type '__NSArrayI' for HTTP Method 'POST'' </pre> <p>Apparently, RestKit does not know how to handle <code>NSArray</code>s. </p> <p><strong>How does one post an array of objects using RestKit?</strong></p> <hr> <p>I've tried something different: I replaced the last line with a manual send through <code>RKObjectLoader</code>.</p> <pre><code>//[mgr postObject:[NSMutableDictionary dictionaryWithObject:array forKey:@"data"] delegate:nil/*self*/]; NSString* syncPath = @"/sync"; RKObjectLoader * objectLoader = [mgr objectLoaderWithResourcePath:syncPath delegate:self]; objectLoader.serializationMIMEType = RKMIMETypeJSON; objectLoader.method = RKRequestMethodPOST; //objectLoader.objectClass = [NSManagedObject class]; //objectLoader.managedObjectStore = mgr.objectStore; objectLoader.params = [NSDictionary dictionaryWithObject:array forKey:@"MyData"]; [objectLoader send]; </code></pre> <p>Unfortunately, this does not apply mapping of any sort, and instead transmits an array of objects' descriptions. Setting <code>serializationMIMEType</code> also does not affect the structure of transmitted contents, and <code>params</code> are always transmitted as <code>application/x-www-form-urlencoded</code>. </p> <p>I also tried assigning serialization mapping and passing the object as <code>targetObject</code> and <code>sourceObject</code> (this seems to be what RestKit does internally in <code>-[RKObjectManager postObject:delegate:]</code>).</p> <pre><code>RKObjectLoader * objectLoader = [mgr objectLoaderWithResourcePath:syncPath delegate:self]; objectLoader.method = RKRequestMethodPOST; //objectLoader.objectClass = [NSManagedObject class]; //objectLoader.managedObjectStore = mgr.objectStore; objectLoader.params = [NSMutableDictionary dictionaryWithObject:array forKey:@"MyData"]; objectLoader.serializationMapping = mapping; objectLoader.serializationMIMEType = RKMIMETypeJSON; objectLoader.sourceObject = objectLoader.params; objectLoader.targetObject = objectLoader.params; [objectLoader send]; </code></pre> <p>Unfortunately, no mapping occurs this way:</p> <pre><code>2011-10-12 12:36:48.143 MyProject[5119:207] D restkit.network:RKObjectLoader.m:290 POST or PUT request for source object { MyData = ( "&lt;NSManagedObject: 0x5935430&gt; (entity: SomeRecord; id: 0x5934da0 &lt;x-coredata://64DF9977-DA50-4FCD-8C20-4132E58439BF/SomeRecord/p1&gt; ; data: &lt;fault&gt;)", "&lt;NSManagedObject: 0x5935730&gt; (entity: SomeRecord; id: 0x5934db0 &lt;x-coredata://64DF9977-DA50-4FCD-8C20-4132E58439BF/SomeRecord/p2&gt; ; data: &lt;fault&gt;)" ); }, serializing to MIME Type application/json for transport... 2011-10-12 12:36:48.143 MyProject[5119:207] D restkit.object_mapping:RKObjectMappingOperation.m:428 Starting mapping operation... 2011-10-12 12:36:48.145 MyProject[5119:207] T restkit.object_mapping:RKObjectMappingOperation.m:291 Did not find mappable attribute value keyPath 'time' 2011-10-12 12:36:48.145 MyProject[5119:207] T restkit.object_mapping:RKObjectMappingOperation.m:291 Did not find mappable attribute value keyPath 'someValue' 2011-10-12 12:36:48.145 MyProject[5119:207] T restkit.object_mapping:RKObjectMappingOperation.m:291 Did not find mappable attribute value keyPath 'lastChange' 2011-10-12 12:36:48.145 MyProject[5119:207] T restkit.object_mapping:RKObjectMappingOperation.m:291 Did not find mappable attribute value keyPath 'uuid' 2011-10-12 12:36:48.145 MyProject[5119:207] D restkit.object_mapping:RKObjectMappingOperation.m:448 Mapping operation did not find any mappable content 2011-10-12 12:36:48.146 MyProject[5119:207] T restkit.network:RKRequest.m:211 Prepared POST URLRequest '&lt;NSMutableURLRequest http://someurl/api/sync?request=provide_key&gt;'. HTTP Headers: { Accept = "application/json"; "Content-Length" = 0; }. HTTP Body: . </code></pre>
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    1. COdo you use CoreData in your project?
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    2. COI do, but in case you were going to suggest it, I don't feel I need RestKit's CoreData integration in this case. Question currently stands as-is ;)
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