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copied!<p>I'll do this backwards: first some things for you to check and then some ideas.</p> <p>Check <a href="https://stackoverflow.com/questions/10427340/extending-core-data-generated-nsmanagedobject-classes">my own question</a>.</p> <p>I'd say that on your custom categories you can do the interface between the JSON representation and your classes.</p> <p>You should also check <a href="http://restkit.org" rel="nofollow noreferrer">RestKit</a> which can do already much of what you need.</p> <hr> <p>You're talking about two separate problems as far as I can understand:</p> <ol> <li>Syncing local data to the server based on connectivity;</li> <li>Using model classes.</li> </ol> <h2>Problem 1</h2> <p>I think you should have a class with the common code and each of your model classes should have its own mapping (to map between model and JSON) and saving methods.</p> <p>Another class, that may be your DataEngine class, takes care of saving the right objects at the right time. Take a look at <a href="http://restkit.org" rel="nofollow noreferrer">RestKit</a> as it helps with the mapping and the saving. I'm not sure about the syncing though.</p> <h2>Problem 2</h2> <p>I think you should have model classes. It helps a lot to work with objects and you have then a place to save methods for finding different kinds of data.</p> <p>For this <a href="https://stackoverflow.com/questions/10427340/extending-core-data-generated-nsmanagedobject-classes">my question</a> might be useful for you because you can create a CoreData model with generated class files and update it whenever you want while keeping your custom code.</p>

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