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copied!<p>Strategy 1 with some modifications appeared to be a working solutions (with some flaws though).</p> <p>Legend:</p> <ul> <li>1st device - started online without any content in the iCloud</li> <li>2nd device - started later than first and OFFLINE. Then it gets online after some items added</li> </ul> <p>So here's the updated strategy:</p> <ul> <li><p>All my categories have creation <strong>time-stamps</strong></p></li> <li><p>The categories <strong>cannot</strong> be renamed (only added or deleted - this is crucial)</p></li> <li><p>All my items have a string categoryName field which gets its value upon item creation and updated whenever item is moved to a different category - this <strong>redundant</strong> information helps to achieve success;</p></li> </ul> <p>On insertion of new <strong>Categories</strong>:</p> <ul> <li><p>On insert from iCloud, I get pairs of categories with same name if any</p></li> <li><p>Select <strong>newer</strong> duplicate categories (they will most probably have less items than old ones so we will have less dance in iCloud)</p></li> <li><p>Move their items if any to <strong>older</strong> duplicate categories</p></li> <li><p>Delete <strong>newer</strong> duplicate categories</p></li> </ul> <p>On insertion of new <strong>Items</strong> - if the item belongs to <strong>deleted</strong> category:</p> <ul> <li><p>CoreData tries to merge it and <strong>fails</strong> as there's no parent category any more (lots of errors in console). It promisses to insert it later.</p></li> <li><p>After some short time it <strong>does merge</strong> and insert the item into storage but with <strong>NIL</strong> category</p></li> <li><p>Here we pick our item up, find out it's parent category from categoryName and put it to the correct category</p></li> </ul> <p>VOILA! - no duplicates & everybody happy</p> <p>A couple of notes:</p> <ol> <li>I get a dance of items belonging to the 2nd device (those that will come with nil category to the 1st device) on both devices. After a couple of minutes everything is stabilized</li> <li>No items is lost though</li> <li>The dance happens only on the first iCloud sync of the 2nd (or any other subsequent device)</li> <li>If the 2nd device is started <strong>online</strong> for the first time the chance that duplicate categories case appears is about 25% only - tested on 3G connection - so dance should not affect the majority of users</li> </ol>

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