show-add-comment-dialog-effect.ts

@Effect()
showAddCommentDialog: Observable<Action> = this.actions.pipe(
    ofType(actions.SHOW_ADD_COMMENT_DIALOG),
    withLatestFrom(
        this.store.select(selectors.getCurrentProductId)),
    concatMap(
        ([{payload}, productId]) =>
            this.dialog.open(AddCommentDialog, {data: payload})
                .afterClosed()
                .pipe(
                    map(comment => comment ?
                            new actions.AddComment({comment, productId}) :
                            new actions.AddCommentDialogCancelled()))),
);