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PORestKit Object Mapping: difficulty using setObjectMapping:forResourcePathPattern:withFetchRequestBlock
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copied!<p><strong>My setup</strong></p> <p>The following all works fine:</p> <pre><code>RKManagedObjectMapping* chanMapping = [RKManagedObjectMapping mappingForClass:[Channel class] inManagedObjectStore:objectStore]; chanMapping.primaryKeyAttribute = @"chanId"; [chanMapping mapKeyPathsToAttributes: @"id",@"chanId", @"name", @"chanName", nil]; [objectManager.mappingProvider setMapping:chanMapping forKeyPath:@"Channels.channel"]; </code></pre> <p>I can call</p> <pre><code>[[RKObjectManager sharedManager] loadObjectsAtResourcePath:@"/channels" delegate:self]; </code></pre> <p>and I get my channel's from the server and they're stored locally by Core Data. Perfect.</p> <p><strong>The issue</strong></p> <p>However, I now wan't to have RestKit automatically delete Channels from the Core Data store that have been removed from the server the next time a GET is performed. I understand this is supported by adding the following:</p> <pre><code>[objectManager.mappingProvider setObjectMapping:chanMapping forResourcePathPattern:@"/channels" withFetchRequestBlock:^ (NSString *resourcePath) { return [Channel fetchRequest]; }]; </code></pre> <p>However with this all the Channels get deleted whenever there is anything new on the server.</p> <p><strong>Things I've tried</strong> [UPDATED]</p> <p>I've debugged using the steps in the answer below. It looks as though the mapping isn't working / is not being found (i.e. I haven't properly associated the mapping with the resource path).</p> <p>In <code>deleteCachedObjectsMissingFromResult</code> the <code>cachedObjects</code> array looks good, has all the objects that should be there from the last time but the <code>results</code> array is empty which obviously results in <code>[results containsObject:object]</code> always being <code>NO</code> and all the objects being deleted.</p> <p>Do I need to change something to do with the resource path mapping?</p>

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