Does adding a new independent entity in Core Data require model versioning?

Question

I want to add a new Core Data Entity in my project. Do I need to add a new core-data Model Version for this or it will work within existing version? The entity is independent and it will have no relation with other previously defined entities.

Answer 1

Indeed, it requires adding a new model version. However, adding a new entity can be handled by a lightweight migration, so at least you don't have to create a mapping model/write custom migration code.

UPDATE:

From the article about lightweight migration:

In addition, Core Data supports: ... Changing the entity hierarchy

• You can add, remove, rename entities
• You can create a new parent or child entity and move properties up and down the entity hierarchy
• You can move entities out of a hierarchy
• You cannot, however, merge entity hierarchies; if two existing entities do not share a common parent in the source, they cannot share a common parent in the destination

And if you don't use versioning, you'll get an error like this:

Error Domain=NSCocoaErrorDomain Code=134100 "(null)" UserInfo={metadata={ NSPersistenceFrameworkVersion = 641; NSStoreModelVersionHashes = { TestEntity1 = ; }; NSStoreModelVersionHashesVersion = 3; NSStoreModelVersionIdentifiers = ( "" ); NSStoreType = SQLite; NSStoreUUID = "F16AD345-02FE-4E94-B11E-3BC337B16568"; "_NSAutoVacuumLevel" = 2; }, reason=The model used to open the store is incompatible with the one used to create the store} with userInfo dictionary { metadata = { NSPersistenceFrameworkVersion = 641; NSStoreModelVersionHashes = { TestEntity1 = ; }; NSStoreModelVersionHashesVersion = 3; NSStoreModelVersionIdentifiers = ( "" ); NSStoreType = SQLite; NSStoreUUID = "F16AD345-02FE-4E94-B11E-3BC337B16568"; "_NSAutoVacuumLevel" = 2; }; reason = "The model used to open the store is incompatible with the one used to create the store"; }

This looks like a good reason to use versioning to me)