Signal Store Entities sort-comparer

[muuvmuuv]

Which @ngrx/* package(s) are relevant/related to the feature request?

signals

Information

The basic store createEntityAdapter supports a sort-comparer, which would be nice to have in Signal-Store withEntities as well.

Describe any alternatives/workarounds you're currently using

New option for entityConfig and make collection optional if not required.

I would be willing to submit a PR to fix this issue

• Yes
• No

[markostanimirovic]

Sorted entities can be defined as a computed signal:

type SortOrder = 'asc' | 'desc';

const UsersStore = signalStore(
  withState({ sortOrder: 'asc' as SortOrder }),
  withEntities<User>(),
  withComputed(({ sortOrder, entities }) => ({
    sortedUsers: computed(() => [...entities()].sort(/* ... sorting logic ... */)),
  })),
);

[alex-derouchie]

Please correct me if I'm wrong here, but I have concerns around efficiency for this approach on large entity sets. If the entities() passed into withComputed are sorted in a different order than what is desired, the entire entity set would have to be sorted anew each time an entity is added. Ideally, we would have a set of entities which is already sorted on hand, to which new entities could be added, needing only one element to be positioned each time.

Is this a valid concern for this approach? Is there a better way of doing this with the existing tools we have (using withEntities)?