如何在颤抖中过滤列表？ [英] How to filter list in flutter?

问题描述

我正在尝试将过滤器添加到列表

I'm trying to add a filter to my list

这是我的工作

productTemp.sort((a, b) => b.productPrice.compareTo(a.productPrice));
        productTemp = productTemp.where((x) =>
            x.productName.toLowerCase().contains(inputText.toLowerCase()));
        productTemp = productTemp.toSet().toList();

此处是我的设置方式

List<ProductsModel> productTemp = [];

然后此

class ProductsModel {
  final String productId;
  final String productName;
  final String isNew;
  final String isHot;
  final String productImage;
  final String categoryId;
  final String productPrice;
  final String productDescription;

  ProductsModel(
      {this.productId,
      this.productName,
      this.isNew,
      this.isHot,
      this.productImage,
      this.categoryId,
      this.productPrice,
      this.productDescription});

  factory ProductsModel.fromJson(Map<String, dynamic> json) {
    return ProductsModel(
      productId: json['productId'] as String,
      productName: json['productName'] as String,
      isNew: json['isNew'] as String,
      isHot: json['isHot'] as String,
      productImage: json['productImage'] as String,
      categoryId: json['categoryId'] as String,
      productPrice: json['productPrice'] as String,
      productDescription: json['productDescription'] as String,
    );
  }

  bool operator ==(o) =>
      o is ProductsModel && productId == o.productId;

  int get hashCode => productId.hashCode;
}

所以我收到此错误

[错误：flutter / lib / ui / ui_dart_state.cc（148）]未处理的异常：类型
'WhereIterable'不是类型
的子类型'列表'

[ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: type 'WhereIterable' is not a subtype of type 'List'

我该如何解决？预先感谢

how can i fix it ? thanks in advance

推荐答案

您的 productTemp 类型为列表，但其中返回可迭代。
您需要将 where 的输出转换为 List 。

Your productTemp is of type List but where returns Iterable. You need to turn the output of where into a List.

productTemp.where((x) =>
            x.productName.toLowerCase().contains(inputText.toLowerCase())).toList();

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