Mutation and update cache

Open Todo/TodoVC.swift and add the following function to delete all the completed todos from the cloud.

Todo/TodoVC.swift

// Remove all completed Todos from cloud
    private func removeAllCompletedTodosCloud(){
        apollo.perform(mutation: ClearCompletedMutation()) { (result, error) in
            guard let data = result?.data else { return }
            if data.deleteTodos?.affectedRows == self.filteredTodos.filter({$0.isCompleted}).count {
                self.todos = self.todos.filter({!$0.isCompleted})
                self.filteredTodos = self.filteredTodos.filter({!$0.isCompleted})
                self.removeTodosMutationLocal(id: -1)
                DispatchQueue.main.async {
                    self.toggleCompleteAction()
                }
            }
        }
    }

And finally update the removeAllCompleted function as below

@IBAction func removeAllCompleted(_ sender: Any) {
        // Remove all completed todos on click of Remove Completed Button
+        removeAllCompletedTodosCloud()
    }

That's a wrap of the basic todo app.