angular - NgRx 通过 dispatch 方法传递 payload 来更新 store

Question

我是学习 ngRx 的新手。我正在尝试创建一个商店，该商店将通过组件的操作进行更新。我正在使用 NgRx create 方法来创建 Action 和缩减器。

请求.Component.ts

import { Component } from '@angular/core';
import { Store, select } from '@ngrx/store';
import { Request } from '../models/request.model';
import { RequestState } from '../reducers/request.reducer';
import { Observable } from 'rxjs';
import { UpdateRequest , LoadAllRequests, DeleteRequest } from '../actions/request.actions';

@Component({
  selector: 'app-request',
  templateUrl: './request.component.html',
  styleUrls: ['./request.component.css'],
})

export class RequestComponent {
  request$: Observable<RequestState>;
  requestList =  Request[2] = [
    { RequestId : '1', Name : 'Test1'},
    { RequestId : '2', Name : 'Test2'},
    { RequestId : '3', Name : 'Test3'}
  ];

  constructor(private store: Store<{ request: RequestState }>) {
    this.request$ = store.pipe(select('request'));
  }

  UpdateRequest() {
    this.store.dispatch(UpdateRequest({request : this.requestList[0]}));
  }

  LoadRequests() {
    this.store.dispatch(LoadAllRequests({requestCollection: this.requestList}));
  }

  DeleteRequest() {
    this.store.dispatch(DeleteRequest({requestID : this.requestList[0].RequestId}));
  }
}

请求.reducer.ts

import { UpdateRequest , LoadAllRequests, DeleteRequest } from '../actions/request.actions';
import { Request, RequestInitial } from '../models/request.model';
import {createReducer, on} from '@ngrx/store';
import { Action } from 'rxjs/internal/scheduler/Action';

// New Interface for Request State
export interface RequestState {
    requestCollection: Request[];
    request: Request;
    requestId: Request['RequestId'];
}

// Initialize Store State with Request Initial Const and empty values
export const requestInitialState: RequestState = {
    requestCollection: [],
    // requestCollection: Request[2] = [
    //   { RequestId : '1', Name : 'Test1'},
    //   { RequestId : '2', Name : 'Test2'},
    //   { RequestId : '3', Name : 'Test3'}
    // ],
    request: RequestInitial,
    requestId: '0'
};

// Create a reducer function with switch state for each action in action.ts
export const requestReducer = createReducer(
  requestInitialState,
  on(UpdateRequest, state => ({
      ...state,
      request : state.request,
  })),
  on(LoadAllRequests, (state , { requestCollection}) => ({
    ...state,
    requestCollection : state.requestCollection
     ]
  })),

);

请求.actions.ts

import {createAction, props} from '@ngrx/store';
import { Request } from '../models/request.model';

export const UpdateRequest = createAction(
  '[Request] UpdateRequest',
  props<{request: Request}>()
);
export const LoadAllRequests = createAction(
    '[Request] LoadAllRequests',
    props<{requestCollection: Request[]}>()
);
export const DeleteRequest = createAction(
    '[Request] DeleteRequest',
    props<{requestID: Request['RequestId']}>()
);
export const loadRequestFailure = createAction(
  '[Request] ErrorRequest',
  props<{error: any}>()
);

请求.component.html

<button click="LoadRequests()">Load All Requests</button>

我想在 LoadRequests() 方法中从 dispatch 方法传递有效负载数据，但 requestCollection 没有通过我运行 LoadRequests 方法得到更新。

我不确定我做错了什么，但我正在尝试创建一个示例，在该示例中我可以将数据从 dispatch 方法传递到操作，然后传递到 reducer 以更新商店。

Answer 1

request.component.html 有问题。您没有正确绑定(bind)。

<button (click) ="LoadRequests()">Load All Requests</button>

此外，您没有在 reducer 函数中使用 payload

  on(LoadAllRequests, (state , { requestCollection }) => ({
    ...state,
    requestCollection : requestCollection
  })),