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POCore Data lightweight migration crashes after App update
 

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  1. POCore Data lightweight migration crashes after App update
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    <p>Two days ago I released the App. According to feedback on AppStore and crash reports from itunesconnect there are a lot of crashes on launch. But not 100% users suffered, only 30% maybe.</p> <p>I've read the crash logs and saw a problem. It's crashing on DB migration process. I use lightweight migration of database. Usually I add new datamodel version very carefully. Even before each release I install a previous version of the App, use it for some time and only then I install the latest version above it. So was this time.</p> <p>I looked through two datamodels (previous and present). Were added:</p> <p>1) New entities (it's OK for lightweight migration) <br> 2) New fields inside existing entities. All they are optional. (OK for lightweight migration) <br> 3) One new field in existing entity which I made optional AND indexed. (OK?) <br></p> <p>None of existing fields and entities were renamed.</p> <p><br> What I did wrong?</p> <p><br></p> <p>Stack trace:</p> <pre><code>Thread 0 name: Dispatch queue: com.apple.main-thread Thread 0: 0 libsystem_kernel.dylib 0x352f439c pread + 20 1 libsqlite3.dylib 0x30d2d632 unixRead 2 libsqlite3.dylib 0x30d4221a readDbPage 3 libsqlite3.dylib 0x30d41156 sqlite3PagerAcquire 4 libsqlite3.dylib 0x30d583be moveToChild 5 libsqlite3.dylib 0x30d8e0e8 moveToLeftmost 6 libsqlite3.dylib 0x30d59582 sqlite3BtreeNext 7 libsqlite3.dylib 0x30d54328 sqlite3VdbeExec 8 libsqlite3.dylib 0x30d4f6c2 sqlite3_step 9 CoreData 0x329e8e2e _execute 10 CoreData 0x329e8d64 -[NSSQLiteConnection execute] 11 CoreData 0x32a8bd54 -[NSSQLConnection prepareAndExecuteSQLStatement:] 12 CoreData 0x32add63c -[_NSSQLiteStoreMigrator performMigration:] 13 CoreData 0x32ad42b8 -[NSSQLiteInPlaceMigrationManager migrateStoreFromURL:type:options:withMappingModel:toDestinationURL:destinationType:destinationOptions:error:] 14 CoreData 0x32a79c02 -[NSMigrationManager migrateStoreFromURL:type:options:withMappingModel:toDestinationURL:destinationType:destinationOptions:error:] 15 CoreData 0x32ac5bf4 -[NSStoreMigrationPolicy(InternalMethods) migrateStoreAtURL:toURL:storeType:options:withManager:error:] 16 CoreData 0x32ac519c -[NSStoreMigrationPolicy migrateStoreAtURL:withManager:metadata:options:error:] 17 CoreData 0x32ac6b58 -[NSStoreMigrationPolicy(InternalMethods) _gatherDataAndPerformMigration:] </code></pre>
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