How to rollback a wrong migration

[poc7667]

If I created a wrong migration,

How could I rollback to the original state,

in addition to remove the migration file, what else should I do ?

And once I created a migration file , should I run rake db:migrate command ?
thanks

Because I created a migration file 002, and the entity name is identical to the previous migration file's entity, then I delete the 002 migration file , and got the following exception, and I don't know what should I do.

(main)> 2015-05-10 23:11:40.973 water_info[16082:65199] CoreData: error: -addPersistentStoreWithType:SQLite configuration:(null) URL:file:///Users/hsu-wei-cheng/Library/Developer/CoreSimulator/Devices/BF0E050B-4A5D-43C6-BACD-A052327FD003/data/Containers/Data/Application/B89CA289-7ED0-4D03-8B9B-F68E00E54CE6/Documents/water_info.sqlite options:{
    NSInferMappingModelAutomaticallyOption = 1;
    NSMigratePersistentStoresAutomaticallyOption = 1;
} ... returned error Error Domain=NSCocoaErrorDomain Code=134130 "The operation couldn’t be completed. (Cocoa error 134130.)" UserInfo=0x116c01840 {URL=file:///Users/hsu-wei-cheng/Library/Developer/CoreSimulator/Devices/BF0E050B-4A5D-43C6-BACD-A052327FD003/data/Containers/Data/Application/B89CA289-7ED0-4D03-8B9B-F68E00E54CE6/Documents/water_info.sqlite, metadata={
    NSPersistenceFrameworkVersion = 519;
    NSStoreModelVersionHashes =     {
        FavoriteLocation = <77a4f3ca f11ed2e0 75d95e0f 4512a24f 316c12d0 080e4966 8fedc7ea 8dd386d9>;
    };
    NSStoreModelVersionHashesVersion = 3;
    NSStoreModelVersionIdentifiers =     (
        "0002 add reservioirs"
    );
    NSStoreType = SQLite;
    NSStoreUUID = "5C83F3F4-CBA3-4A10-BA48-8E3ECAA65507";
    "_NSAutoVacuumLevel" = 2;
}, reason=Can't find model for source store} with userInfo dictionary {
    URL = "file:///Users/hsu-wei-cheng/Library/Developer/CoreSimulator/Devices/BF0E050B-4A5D-43C6-BACD-A052327FD003/data/Containers/Data/Application/B89CA289-7ED0-4D03-8B9B-F68E00E54CE6/Documents/water_info.sqlite";
    metadata =     {
        NSPersistenceFrameworkVersion = 519;
        NSStoreModelVersionHashes =         {
            FavoriteLocation = <77a4f3ca f11ed2e0 75d95e0f 4512a24f 316c12d0 080e4966 8fedc7ea 8dd386d9>;
        };
        NSStoreModelVersionHashesVersion = 3;
        NSStoreModelVersionIdentifiers =         (
            "0002 add reservioirs"
        );
        NSStoreType = SQLite;
        NSStoreUUID = "5C83F3F4-CBA3-4A10-BA48-8E3ECAA65507";
        "_NSAutoVacuumLevel" = 2;
    };

[markrickert]

Currently, rollbacks aren't supported in CDQ, so you'll have to delete the DB and start over again (easiest way is to just delete the app from the simulator). A cdq.reset! might do the trick too, but I'm not sure about that.

If you've already pushed a version with the incorrect field to the app store, you'll have to make your next migration still include it and simply add a new column to the table.

[kemiller]

I assume you are talking about your local environment? In that case, simply resetting your simulator or deleting the app from your phone is probably what you want. cdq.reset! should do the trick too.

If you mean that a migration got into production, that's serious. You are better off making a new migration to fix the damage.