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core-datanspredicatepredicateswift5

Swift5 Simple Core Data NSPredicate Get

I'm simply trying to access a record in core data by a property I've named "id" that is of String type. The following keeps complaining about 'Unable to parse the format string "id == 8DF3F2C6741B47C8864D1052C36E2C4D"'. How can I solve this issue?

private func getEntity(id: String) -> NSManagedObject? {
    var myEntity: NSManagedObject?

    let fetchRequest = NSFetchRequest<NSManagedObject>(entityName: "MyEntity")
    fetchRequest.predicate = NSPredicate(format: "id = \(id)")
    do {
        var tempArray = try getCurrentManagedContext().fetch(fetchRequest)
        myEntity = tempArray.count > 0 ? tempArray[0] : nil
    } catch let error as NSError {
        print("get failed ... \(error) ... \(error.userInfo)")
    }

    return myEntity
}
Solution

  • It’s a format string. Instead of

    NSPredicate(format: "id = \(id)")

    Write

    NSPredicate(format: "id == %@", id)