generic ngrx/signalStore - how to load only once

[jmls]

I have managed to create a generic signalstore - perhaps wrongly ;) I used the following construct

export function EntityStoreFactory<
    T extends { id: string; name?: string}>() {
    return signalStore(
        { providedIn: 'root' },
        withState(initialState),
        withEntities<T>(),
    ..... snip ... 

I then get an instance of the store in a component with

store = inject(
        EntityStoreFactory<User>()

this works fine - I get an appropriate store for each "type" that I want

However, as you can guess, it creates a new instance of the store every time I use a component

I tried playing around with InjectionTokens but couldn't get anywhere, and gemini and chatgpt were useless ;)

I was thinking along the lines of creating a incjectable service (let's say UserStore) where a property on that service is set using the inject. Then I can inject the UserStore into the component which, as it's provided in root would be a singleton

Does that make sense ? Do you angular gurus have a better way of achieving the task ?
Thanks in advance

[rainerhahnekamp]

Well, if it is a generic one, have you ever thought of creating a generic feature? It could look like this:

interface Movie {
  id: 1;
  name: string;
}

interface Book {
  isbn: string;
  name: string;
}

function withGenericEntities<Entity>(selectId: SelectEntityId<Entity>) {
  return signalStoreFeature(
    withEntities<Entity>(),
    withMethods((store) => ({
      add(entity: Entity) {
        patchState(store, addEntity(entity, { selectId }));
      },
    }))
  );
}

function createStore<Entity>(selectId: SelectEntityId<Entity>) {
  return signalStore(
    { providedIn: 'root' },
    withGenericEntities<Entity>(selectId)
  );
}

export const MovieStore = createStore<Movie>((movie) => movie.id);
export const BookStore = createStore<Book>((book) => book.isbn);

const movieStore = new MovieStore();
movieStore.add({ id: 1, name: 'Star Wars' });

Example Stackblitz: https://stackblitz.com/edit/github-pqmghd?file=src%2Fgeneric-store.ts