没有为'List<Meals>函数({bool growable})‘定义getter’长度‘。

Question

我正在学习颤振，并且遵循一个教程，我准确地复制了他的代码，但是由于某些原因，我在我的代码中遇到了这个错误，该错误声明如下

class categoryMealsScreen extends StatelessWidget {
  static const routeName = '/category-meal';

  @override
  Widget build(BuildContext context) {
    final routeArgs =
        ModalRoute.of(context)!.settings.arguments as Map<String, String>;
    final categoryTitle = routeArgs['title'];
    final categoryId = routeArgs['id'];
    final categoryMeals = DUMMY_MEALS.where((meal) {
      return meal.categories.contains(categoryId);
    }).toList;
    return Scaffold(
      appBar: AppBar(
        title: Text(categoryTitle!),
      ),
      body: ListView.builder(
        itemBuilder: (ctx, index) {
          return Text(categoryTitle);
        },
        **itemCount: categoryMeals.length,**
      ),
    );
  }
}

Answer 1

将toList更改为toList()。

final categoryMeals = DUMMY_MEALS.where((meal) { 
  return meal.categories.contains(categoryId);
   }).toList;