NGRX 实体：如何在模板中使用它？

Question

I followed a tutorial on how to implement an NGRX store with an NGRX entity.

Everything seems to work (as far as I can tell using the dev-tools-extension). However, I don't know how I should/can iterate over the result in the template.

The template:

<h3>MOVIES</h3>

  <ng-container *ngIf="movies$">
      <table>
        <tbody>
        <tr *ngFor="let movie of (movies$ | async); let i = index">
          <li>
            {{movie?.title}}
          </li>
        </tr>
        </tbody>
      </table>
  </ng-container>

The component:

@Component({
  selector: 'app-movies',
  templateUrl: './movies.component.html',
  styleUrls: ['./movies.component.scss']
})
export class MoviesComponent implements OnInit {

  movies$: Observable<Dictionary<Movie>>;

  constructor(private store: Store<MovieState>) {
    this.store.dispatch(loadMovies());
    this.movies$ = this.store.pipe(select(selectMovieEntities))
  }

  ngOnInit(): void {
  }

}

And for completeness, the reducer:

const {
  selectIds,
  selectEntities,
  selectAll,
  selectTotal
} = fromReducer.adapter.getSelectors();

export const getMovieState = createFeatureSelector<fromReducer.State>(fromReducer.moviesFeatureKey);

export const selectMovieEntities = createSelector(getMovieState, selectEntities);

The Error-Message:

I'm wondering if I should "map" the result set first or what else is best practice here.

Hope for your help!

Answer 1

selectEntities returns the entities state as a dictionary (id is the key). If you just want the entities (as an array), use the selectAll selector.

export const selectMovieEntities = createSelector(getMovieState, selectAll);