Why am I getting Incorrect argument label in call - ios

Question

Getting "Incorrect argument label in call (have 'rest:', expected 'restaurant:')" error. Here is the code. The parameter is correct and I am passing the correct type? Is this because they are class methods?
class func save(restaurant: Restaurant, toCloud: Bool) -> Bool {
var rest:RestaurantMO
var saved:Bool = false
if let appDelegate = (UIApplication.shared.delegate as? AppDelegate) {
rest = RestaurantMO(context: appDelegate.persistentContainer.viewContext)
rest.name = restaurant.name
rest.item = restaurant.item
rest.location = restaurant.location
rest.isVisited = restaurant.isVisited
// Core Data Exercise - Solution
rest.phone = restaurant.phone
let entity =
NSEntityDescription.entity(forEntityName: "Restaurant",
in: appDelegate.persistentContainer.viewContext)!
_ = NSManagedObject(entity: entity,
insertInto: appDelegate.persistentContainer.viewContext)
print("Saving data to context ...")
appDelegate.saveContext()
saved = true
}
if toCloud {
saveRecordToCloud(rest:RestaurantMO) <--- ERROR: Incorrect argument label in call (have 'rest:', expected 'restaurant:')
}
}
class func saveRecordToCloud(restaurant:RestaurantMO!) -> Void {
// Prepare the record to save
let record = CKRecord(recordType: "Restaurant")
record.setValue(restaurant.name, forKey: "name")
record.setValue(restaurant.item, forKey: "item")
record.setValue(restaurant.location, forKey: "location")
record.setValue(restaurant.phone, forKey: "phone")
let imageData = restaurant.image! as Data
// Resize the image
let originalImage = UIImage(data: imageData)!
let scalingFactor = (originalImage.size.width > 1024) ? 1024 / originalImage.size.width : 1.0
let scaledImage = UIImage(data: imageData, scale: scalingFactor)!
// Write the image to local file for temporary use
let imageFilePath = NSTemporaryDirectory() + restaurant.name!
let imageFileURL = URL(fileURLWithPath: imageFilePath)
try? UIImageJPEGRepresentation(scaledImage, 0.8)?.write(to: imageFileURL)
// Create image asset for upload
let imageAsset = CKAsset(fileURL: imageFileURL)
record.setValue(imageAsset, forKey: "image")
// Get the Public iCloud Database
let publicDatabase = CKContainer.default().publicCloudDatabase
// Save the record to iCloud
publicDatabase.save(record, completionHandler: { (record, error) -> Void in
// Remove temp file
try? FileManager.default.removeItem(at: imageFileURL)
})
}

Answer 1

The parameter is correct and I am passing the correct type
No, both are wrong.
The method is declared as
class func saveRecordToCloud(restaurant:RestaurantMO!)
The parameter label is restaurant rather than rest (stated clearly by the error message)
The parameter type is RestaurantMO rather than RestaurantMO.type (an instance is expected)
The correct syntax is
saveRecordToCloud(restaurant: rest)
Note: As the parameter is non-optional remove the exclamation mark in the method declaration:
func saveRecordToCloud(restaurant:RestaurantMO)