How to group list inside another group list.

[usernamekk]

How to group list inside another group list.

[Dimibe]

@usernamekk Please describe what you want to do, what you have tried so far an what is not working.

[usernamekk]

I have a custom object and also json decoder in my code. In my object, I have fields like name,lga,townOfOrigin etc. I have grouped these people into lga(Local Government Area of origin) group but inside the lga group, want to group their townOfOrigin also, then names of people.

class People  {
  final String id;
  final String title;
  final String name;
  final String location;
  final String lga;
  final String Office;
  final String townOfOrigin;
  final String phone;
  final String email; 
  final String imageUrl;
  bool isExpanded;
)

StickyGroupedListView<People, String>(
            elements: Users,
            groupBy: (element) => element.lga,
            groupSeparatorBuilder: (filteredUsers) => Text(filteredUsers.lga),
            itemBuilder: (ctx, filteredUsers) => Text(filteredUsers.townOfOrigin)..........expanded....  Text(filteredUsers.name)

Sample of what I was able to get from your StickyGroupedListView here

lga => townOfOrigin => names

I hope you will understand. Thanks

[usernamekk]

Waiting for your reply.

[Dimibe]

@usernamekk The way you are trying to archive that will not work because itemBuilder has only individual people.

A solution which might work will need to look like the following:

• Group your people accoring thier lga before hand.
• Users will then be a List<List<People>> instead of List<People>
• Change StickyGroupedListView<People, String> to StickyGroupedListView<List<People>, String>
• groupBy can be grouped by the lga of any of the People inside each List because they all should have the same lga.
• itemBuilderwill then get a List<People> which can be again used for another StickyGroupedListView which is grouped by townOfOrigin.

One remark: I did not test this and do not know if this will work. I'm closing the issue because this is not an issue of this package but more an implementation question.