app.swift

class func setupRealm() {
    let config = Realm.Configuration(
        deleteRealmIfMigrationNeeded: true
    )
    Realm.Configuration.defaultConfiguration = config

    // Test
    do {
        try Realm()
    } catch let error as NSError {
        print("Realm error: \(error)")
        do {
            try NSFileManager.defaultManager().removeItemAtURL(Realm.Configuration.defaultConfiguration.fileURL!)
        } catch let error as NSError {
            print("Ooops! Something went wrong: \(error)")
        }
    }
}