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    <p><strong>Deleting the app is sometimes not the case!</strong> Suggest, your app has already been published! You can't just add new entity to the data base and go ahead - you need to perform migration!</p> <p><strong>For those who doesn't want to dig into documentation and is searching for a quick fix:</strong></p> <ol> <li>Open your .xcdatamodeld file</li> <li>click on Editor</li> <li>select Add model version...</li> <li>Add a new version of your model (the new group of datamodels added)</li> <li>select the main file, open file inspector (right-hand panel)</li> <li>and under <code>Versioned core data model</code> select your new version of data model for current data model</li> <li>THAT'S NOT ALL ) You should perform so called "light migration".</li> <li>Go to your <code>AppDelegate</code> and find where the <code>persistentStoreCoordinator</code> is being created</li> <li>Find this line <code>if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&amp;error])</code></li> <li>Replace <code>nil</code> options with <code>@{NSMigratePersistentStoresAutomaticallyOption:@YES, NSInferMappingModelAutomaticallyOption:@YES}</code> (actually provided in the commented code in that method)</li> <li>Here you go, have fun!</li> </ol> <p>P.S. This only applies for lightweight migration. For your migration to qualify as a lightweight migration, your changes must be confined to this narrow band:</p> <ul> <li>Add or remove a property (attribute or relationship).</li> <li>Make a nonoptional property optional.</li> <li>Make an optional attribute nonoptional, as long as you provide a default value.</li> <li>Add or remove an entity.</li> <li>Rename a property.</li> <li>Rename an entity.</li> </ul>
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    1. POThe model used to open the store is incompatible with the one used to create the store
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    1. COits Great !!! Working for me. Thanks.
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      1. USHardik Darji
 

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