'Object' is ambiguous for type lookup in this context in Xcode 9

Question

I want to update my app for iOS 11, and have this issue. This is my current code:

protocol DataSourceDelegate: class {
    associatedtype Object

    func cellIdentifierForObject(object: Object) -> String
    func swipeToDeleteObject(object: Object)
}

This protocol is used in one of my view controller:

extension TransactionsViewController: DataSourceDelegate {
    func cellIdentifierForObject(object: Object) -> String {
        return "Cell"
    }

    func swipeToDeleteObject(object: Object) {
        object.managedObjectContext?.performChanges {
            object.managedObjectContext?.delete(object)
        }
    }
}

Now I get this error for the Object type:

'Object' is ambiguous for type lookup in this context

On this line:

func cellIdentifierForObject(object: Object) -> String { ... }

For my this issue appears because there are some other Object type in my project. I tried to put the protocol or class name in front of the name, but I still get error.

Answer 1

In my case, I had this ambiguity because the class was declared in a swift file and also being auto-generated by my data model.

If you already declare your class in a swift file, then make sure the code generation is disabled for it.

1. Select your entity in your xcdatamodeld
2. Open the third tab, Data Model inspector:
   
3. Set Codegen to Manual/None