Question

我正在使用Angular 6和NgRX 6。

我有一个看起来像这样的减速器-

export interface IFlexBenefitTemplateState {
  original: IFlexBenefitTemplate;
  changes: IFlexBenefitTemplate;
  count: number;
  loading: boolean;
}

export const INITIAL_STATE: IFlexBenefitTemplateState = {
  original: null,
  changes: null,
  count: 0,
  loading: true,
};

export default (state = INITIAL_STATE, { type, payload }) => {
  switch (type) {

    case STAGE_TEMPLATE_CHANGE:
      const pendingChanges = Object.assign({}, state.changes.sections);
      const newSection = Object.assign({}, pendingChanges[payload.key], payload, {
        changeType: 'updated',
      });

      return {
        ...state,
        changes: {
          sections: Object.assign({}, pendingChanges, { [payload.key]: { ...newSection } }),
        },
        count: !pendingChanges[payload.key].hasOwnProperty('changeType') ? state.count + 1 : state.count,
      };

    default:
      return state;
  }
};

我有一个选择器，它为我抓住了state.count，看起来像这样-

export const changesCount = createSelector(getStore, (state: IFlexBenefitTemplateState) => state.count);

我正在尝试显示这是我的模板，如下所示-

@Component({
  selector: 'app-page-header-component',
  templateUrl: './page-header.component.html',
})
export class PageHeaderComponent implements OnInit {
  public count$: Observable<number>;

  public language: string;

  constructor(private store: Store<ICommonAppState>) {}

  ngOnInit(): void {
    this.count$ = this.store.select(changesCount);
    this.language = 'English';
  }
}

this.count$返回错误

[ts] Argument of type 'MemoizedSelector<IBenefitsState, number>' is not assignable to parameter of type 'string'.

我一生无法理解这是怎么回事？

Answer 1

我会检查您是否在store注入中传递了正确的接口。

IFlexBenefitTemplateState上是否存在ICommonAppState？

Answer 2

我有同样的错误。问题出在我的商店中没有错误的界面。相反，我使用了错误的选择器。

感谢@nodediggity使我朝正确的方向看。

不能将MemoizedSelector分配给“字符串”类型的参数

2 个答案: