Databases
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PO
 

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    <p>This is quite simple - once you know where to look.# In your AppDelegate you set-up the NSPersistentStoreCoordinator - and you need to add some options to this to tell it to handle auto-migrate:</p> <pre><code>NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption, [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil]; NSError *error; _persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]]; if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:options error:&amp;error]) { // Handle error NSLog(@"Problem with PersistentStoreCoordinator: %@",error); } </code></pre> <p>Then you need to do in xCode:</p> <ol> <li>Select your xcdatamodeld file</li> <li>Select the Editor Menu at the top - then choose Add Model Version</li> <li>Now your xcdatamodeld file have two (modelname.xcdatamodel &amp; modelname2.xcdatamodel ) .</li> <li>Now modelname.xcdatamodel have the green check mark implies it is current version, but we need to change the modelname2.xcdatamodel as a current version</li> <li>Select the xcdatamodeld file and then select the View Menu at the top - then Choose Utilities - then Choose the Show File Inspector is shown in right side of Xcode and then Select the Versioned Core Data Model - have Current(DropDownList) - select modelname2(the one you just made current version have green check mark).</li> <li>Now when you install this version onto a device that has the old model - it will automatically upgrade that model to the new model.<br></li> </ol> <p>keep all of the changed files and then once you get ready to deploy your update you'll delete all the in-between files and just deploy with the oldest and latest models. vice versa (step 4,5,6) for latest to old model(current) </p>
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    1. POHow do I test whether core data migration is working using adhoc builds?
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    1. USBalakrishnan Mca
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    1. COAs my question states, how do I install an ad hoc build over an existing app on the device without deleting the app from the device
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      1. USTheLearner
    2. COyour two build must be ad hoc first install old one(before your actual change) with [Bundle versions string, short] in plist and update new one with [Bundle versions string, short] greater than old one.
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      1. USBalakrishnan Mca
 

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