这是我第一次使用 ngRx Store,我实现了我的第一个效果..
什么工作正常:
- 与后端通信
- 正在后端执行操作(删除、添加、获取)
- 有效载荷从效果到达减速器(记录下来以确保)
所以我的问题是我无法从减速器中获取数据。如果我从组件中的存储中选择数据,则会在组件中获得未定义的数据。我点击了效果中的数据,数据被明确传递了。还将数据记录在减速器中 - 它就在那里。但是当它返回时,它返回未定义。ReDux Devtools 记录一切正常。最后但并非最不重要的一点.. 即使使用固定值,状态也不会更新,例如用于加载的 true/false 布尔值。
乐代码:
// 我得到未定义的地方
export class ProfileComponent implements OnInit {
user: any;
items$: Observable<Product[]>;
loading$: Observable<boolean>;
error$: Observable<Error>;
newItem: Product = {id: 0, name:""};
constructor(private keycloakService: KeycloakService, private store: Store<ProductState>, private productService: ProductService) { }
ngOnInit(): void {
this.productService.setToken(this.keycloakService.getToken());
this.user = this.keycloakService.getUsername();
this.items$ = this.store.select(store => store.list);
this.loading$ = this.store.select( store => store.loading);
this.error$ = this.store.select( store => store.error);
this.store.dispatch(new LoadProduct());
this.items$.subscribe(val => console.log(val));
this.loading$.subscribe(val => console.log(val));
this.error$.subscribe(val => console.log(val));
}
// 减速器
export type Action = Products.All;
const initialState: ProductState = {
list: [],
loading: false,
error: undefined
}
const newState = (state, newData) => {
return Object.assign({}, state, newData);
}
export function reducer(state: ProductState = initialState, action: Action) : ProductState{
console.log(action.type, state);
switch (action.type) {
case Products.LOAD_PRODUCT: return { ...state, loading: true};
case Products.LOAD_PRODUCT_SUCCESS: return newState(state, {list: action.payload, loading: false, error: undefined});
case Products.LOAD_PRODUCT_FAILURE: return { ...state, error: action.payload, loading: false};
case Products.ADD_PRODUCT: return { ...state, loading: true};
case Products.ADD_PRODUCT_SUCCESS: return { ...state, list: action.payload, loading: false};
case Products.ADD_PRODUCT_FAILURE: return { ...state, error: action.payload, loading: false};
case Products.REMOVE_PRODUCT: return { ...state, loading: true};
case Products.REMOVE_PRODUCT_SUCCESS: return { ...state, list: state.list.filter(item => item.id !== action.payload), loading: false};
case Products.REMOVE_PRODUCT_FAILURE: return { ...state, error: action.payload, loading: false};
default: return state;
}
我非常感谢你的帮助:)