SwiftUI delete core data

Question

I have written a delete all function in SwiftUI. It compiles but fails when running on the simulator.

    @Environment(\.managedObjectContext) var context

    let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "InvItem")

    // Create Batch Delete Request
    let batchDeleteRequest = NSBatchDeleteRequest(fetchRequest: fetchRequest)

    do {
        try context.execute(batchDeleteRequest)

    } catch {
        // Error Handling
        print("Did not clear core data")
    }
}

The error is as follows: Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+entityForName: nil is not a legal NSPersistentStoreCoordinator for searching for entity name 'InvItem'' terminating with uncaught exception of type NSException

Can someone help?

Answer 1

You have to execute the fetch request on the persistent store coordinator

@Environment(\.managedObjectContext) var context

    let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "InvItem")

    // Create Batch Delete Request
    let batchDeleteRequest = NSBatchDeleteRequest(fetchRequest: fetchRequest)
    let persistentStoreCoordinator = context.persistentStoreCoordinator!
    do {
        try persistentStoreCoordinator.execute(batchDeleteRequest, with: context)

    } catch {
        // Error Handling
        print("Did not clear core data", error)
    }