如何通过dart中的另一个项目列表搜索对象列表 [英] How to search a list of Object by another list of items in dart

问题描述

如何搜索其属性之一与另一个字符串列表中的任何值匹配的类对象列表

How to search a list of a class object with one of its property matching to any value in another list of strings

我能够基于单个字符串，但不在字符串列表上。

I am able to get filtering based on a single string , but not on a list of strings

final List<shop_cart.ShoppingCart> cartprd = snapshot.documents
      .map((f) => shop_cart.ShoppingCart.fromMap(f.data))
      .toList();

推荐答案

  List<SomeClass> list = list to search;
  List<String> matchingList = list of strings that you want to match against;

  list.where((item) => matchingList.contains(item.relevantProperty));

如果列表中的项目数为大，则可能需要这样做：

If the number of items in list is large, you might want to do:

  List<SomeClass> list = list to search;
  List<String> matchingList = list of strings that you want to match against;

  final matchingSet = HashSet.from(matchingList);

  list.where((item) => matchingSet.contains(item.relevantProperty));

否则，始终将匹配值存储为哈希集。

Or else just always store the matching values as a hashset.

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