Looking to select a list of all entities from two entity caches using NgRx Data about ngrx-entity-relationship HOT 2 CLOSED

That does, thanks a lot!

from ngrx-entity-relationship.

Hi @ben-hastings,

thanks for the question.

Your investigation is right. Every selector requires a parameter which provides an id or an array of them.
The idea behind this is that a cache can contain a union of 2 lists.
For example, public projects and my projects. Both of them are cached under projects, but we wouldn't want to display someone's public project in my projects.

Nevertheless, it doesn't stop us from providing a selector of all ids, because root selectors accept as the parameter not only ids, but a selector which returns them.

Therefore we need a selector which gets all ids.

const allUserIds = createSelector(selectCompanyState, state => state.ids);

And later in code, we can select all users like that.

const allUsers$ = this.store.select(selectUsers, allUserIds);

Profit.

If you still want to have a single selector without using parameters, then you could follow this guide: https://ngrx-entity-relationship.sudo.eu/extra/usage-with-createselector, and do something like that:

export const selectAllUsers = createSelector(
  // selecting the whole store
  s => s,
  // selecting ids
  allUserIds,
  // selecting all users with desired relationships
  selectUsers,
);

store.select(selectAllUsers).subscribe(users => {
  // profit
});