在使用Angular和NGRX时,有时候会遇到Entity
和selectAll
方法的奇怪行为。以下是一些可能的解决方法和代码示例:
Entity
和selectAll
方法之前,已经成功加载了数据。可以使用*ngIf
或async
管道来等待数据加载完成。// component.ts
import { Component, OnInit } from '@angular/core';
import { Store, select } from '@ngrx/store';
import { selectAll, State } from './reducers';
import { loadEntities } from './actions';
@Component({
selector: 'app-my-component',
template: `
`,
})
export class MyComponent implements OnInit {
entities$ = this.store.pipe(select(selectAll));
constructor(private store: Store) {}
ngOnInit() {
this.store.dispatch(loadEntities());
}
}
EntityAdapter
。确保在reducer中使用createEntityAdapter
创建适配器,并将其作为createReducer
的参数之一。// reducer.ts
import { createEntityAdapter, EntityState } from '@ngrx/entity';
export interface Entity {
id: number;
// other properties
}
export interface State extends EntityState {}
export const adapter = createEntityAdapter();
export const initialState: State = adapter.getInitialState();
export const reducer = createReducer(
initialState,
// other reducer actions
);
Entity
和selectAll
方法时,传递正确的state属性。EntityAdapter
默认使用entities
属性存储实体数据。确保在使用selectAll
方法时,将正确的state属性传递给方法。// component.ts
import { selectAll, State } from './reducers';
entities$ = this.store.pipe(select(state => selectAll(state.entities)));
这些解决方法可以帮助你解决Angular和NGRX中Entity
和selectAll
方法的奇怪行为。请根据你的具体情况进行调整和使用。