How to identify Core Data Managed Object Model -- hash?

Question

Is there a method to get a unique hash for a Core Data Managed Object Model, so that I can see if the core data store is up-to-date with a specific model? I am building a core data sync system, and I want to make sure that the core data stores which are being synced are using the same version of the managed object model.

Answer 1

The model itself does not have a hash value, but

[managedObjectModel entities]

returns the array of entity descriptions, and each entity description has a versionHash property. You could compare these with the version hashes in the metaData dictionary of the persistent store.

But to check the compatibility of a store with a model you can also use

isConfiguration:compatibleWithStoreMetadata:

as described in "Is Migration Necessary" in the "Core Data Model Versioning and Data Migration Programming Guide".