Delete/Reset all entries in Core Data?

Question

Do you know of any way to delete all of the entries stored in Core Data? My schema should stay the same; I just want to reset it to blank.

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Edit

Answer 1

One other method (apart from a delete batch request) I often use (based on app requirement) is to reset the persistent store. The implementation looks like this for iOS 10+ and Swift (assuming you have a CoreDataManager class):

let persistentContainer: NSPersistentContainer = {
    let container = NSPersistentContainer(name: "“)
    container.loadPersistentStores(completionHandler: { (storeDescription, err) in
        if let err = err {
            fatalError("loading of store failed: \(err)")
        }
    })
    return container
}()

func resetPersistentStore() {

    if let persistentStore = persistentContainer.persistentStoreCoordinator.persistentStores.last {
        let storeURL = persistentContainer.persistentStoreCoordinator.url(for: persistentStore)

        do {
            try persistentContainer.persistentStoreCoordinator.destroyPersistentStore(at: storeURL, ofType: NSSQLiteStoreType, options: nil)
        } catch {
            print("failed to destroy persistent store:", error.localizedDescription)
        }

        do {
            try persistentContainer.persistentStoreCoordinator.addPersistentStore(ofType: NSSQLiteStoreType, configurationName: nil, at: storeURL, options: nil)
        } catch {
            print("failed to re-add persistent store:", error.localizedDescription)
        }
    }

}

One advantage of this method is that it’s more straightforward especially when you have loads of data record for numerous entities in your core data. In which case a delete batch request would be memory intensive.