@Inject
    lateinit var catalogUseCase: CatalogUseCase
    
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        app.component.inject(this)

        val factory = object : ViewModelProvider.Factory {
            override fun <T : ViewModel?> create(modelClass: Class<T>): T {
                return CoursesViewModel(catalogUseCase) as T
            }
        }

        coursesViewModel = ViewModelProvider(this, factory).get(CoursesViewModel::class.java)
    }