省道-筛选对象列表的行为意外...不知何故，所有的对象都包含一个字符串

Question

当我试图过滤列表时，我得到了非常奇怪的行为。这让我措手不及，因为我在其他语言中已经无数次这样做了，以前从未见过这种行为。

  List<Product> getFilteredProducts(String searchTerm){
    print('getting filtered products');
    List<Product> products = ProductsRepository.loadProducts(Category.all);
    print('Search term used: ' + searchTerm);
    List<Product> filteredProducts = products.where((product) => (product.name.contains(searchText))).toList();
    print(filteredProducts.map((prod) => prod.name));
    print(products.map((prod) => prod.name.contains(searchText))); // sanity check
    return filteredProducts;
  }

I/flutter ( 8401): getting filtered products  
I/flutter ( 8401): Search term used: Stella  
I/flutter ( 8401): (Vagabond sack, Stella sunglasses, Whitney belt, ..., Sunshirt dress, Fine lines tee)  
I/flutter ( 8401): (true, true, true, true, true, true, true, true, true, true, ..., true, true)

class ProductsRepository {
  static List<Product> loadProducts(Category category) {
    List<Product> allProducts = <Product> [
      Product(
        category: Category.accessories,
        id: 0,
        isFeatured: true,
        name: 'Vagabond sack',
        price: 120,
      ),
      Product(
        category: Category.accessories,
        id: 1,
        isFeatured: true,
        name: 'Stella sunglasses',
        price: 58,
      ),
      Product(
        category: Category.accessories,
        id: 2,
        isFeatured: false,
        name: 'Whitney belt',
        price: 35,
      ),
      Product(
        category: Category.accessories,
        id: 3,
        isFeatured: true,
        name: 'Garden strand',
        price: 98,
      ),
      Product(
        category: Category.accessories,
        id: 4,
        isFeatured: false,
        name: 'Strut earrings',
        price: 34,
      ),
      Product(
        category: Category.accessories,
        id: 5,
        isFeatured: false,
        name: 'Varsity socks',
        price: 12,
      ),
      Product(
        category: Category.accessories,
        id: 6,
        isFeatured: false,
        name: 'Weave keyring',
        price: 16,
      ),
      Product(
        category: Category.clothing,
        id: 36,
        isFeatured: false,
        name: 'Sunshirt dress',
        price: 58,
      ),
      Product(
        category: Category.clothing,
        id: 37,
        isFeatured: true,
        name: 'Fine lines tee',
        price: 58,
      ),
    ];
    if (category == Category.all) {
      return allProducts;
    } else {
      return allProducts.where((Product p) {
        return p.category == category;
      }).toList();
    }
  }
}

以下是我的依赖关系：

environment:
  sdk: ">=2.7.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter
  intl: ^0.15.6

  cupertino_icons: ^0.1.0
  shrine_images: 1.1.1
  provider: ^4.0.0

Answer 1

您正在传递SerchTerms，但使用SearchText进行筛选。

试试这个：

List<Product> getFilteredProducts(String searchTerm){
    print('getting filtered products');
    List<Product> products = ProductsRepository.loadProducts(Category.all);
    print('Search term used: ' + searchTerm);
    List<Product> filteredProducts = products.where((product) => (product.name.contains(searchTerm))).toList();
    print(filteredProducts.map((prod) => prod.name));
    print(products.map((prod) => prod.name.contains(searchTerm))); // sanity check
    return filteredProducts;
  }