Filter list with whereIn condition in Flutter?

Question

This code sample works fine.

var box = await Hive.openBox<MainWords>('mainWords');
box.values.where((item)  {
      return item.category == "6" || item.category == '13';
    }).toList();

I am trying to filter a list with whereIn condition but it must filter like

List<String> categoryList = ['6', '13'];
var box = await Hive.openBox<MainWords>('mainWords');
box.values.where((item)  {
      return item in categoryList; // just an examle
    }).toList();

How can i achive this?

Solution

You should not use the keyword in but the method contains to check if your item exists inside categoryList. Moreover you cannot compare values of different types, I'm seeing that you are returning with box.values an Iterable<MainWords>.

I don't know the content of this class but the item variable is of type MainWords and so it cannot be compared with a String object directly.

I am supposing that you have some access to a String value from your class MainWords so you will need to compare this value with your list.

Code Sample

List<String> categoryList = ['6', '13'];
var box = await Hive.openBox<MainWords>('mainWords');

// As I don't know what are MainWords' properties I named it stringValue.
box.values.where((item) => categoryList.contains(item.stringValue)).toList();

Comments

[Raine Dale Holgado]

Maybe categoryList.contains(item)?, are you trying to filter the values based on categoryList?. Please clarify what you trying to do