当使用Angular和NgRx时,可能会遇到动作联合类型错误。这种错误通常是由于未正确定义动作联合类型或未正确使用动作类型导致的。以下是一些解决方法:
export enum ActionTypes {
LoadData = '[Data] Load Data',
AddData = '[Data] Add Data',
UpdateData = '[Data] Update Data',
DeleteData = '[Data] Delete Data',
}
export class LoadData implements Action {
readonly type = ActionTypes.LoadData;
constructor(public payload: any) {}
}
export class AddData implements Action {
readonly type = ActionTypes.AddData;
constructor(public payload: any) {}
}
export class UpdateData implements Action {
readonly type = ActionTypes.UpdateData;
constructor(public payload: any) {}
}
export class DeleteData implements Action {
readonly type = ActionTypes.DeleteData;
constructor(public payload: any) {}
}
export type DataActions = LoadData | AddData | UpdateData | DeleteData;
ofType
操作符来筛选出特定的动作类型。示例如下:import { ofType } from '@ngrx/effects';
...
@Effect()
loadData$ = this.actions$.pipe(
ofType(DataActionTypes.LoadData), // 使用正确的动作类型
switchMap(() =>
this.dataService.loadData().pipe(
map((data) => new LoadDataSuccess(data)),
catchError((error) => of(new LoadDataFailure(error)))
)
)
);
import { ActionTypes, DataActions } from './data.actions';
...
export function dataReducer(state = initialState, action: DataActions): State {
switch (action.type) {
case ActionTypes.LoadData: // 使用正确的动作类型
return { ...state, loading: true };
case ActionTypes.LoadDataSuccess: // 使用正确的动作类型
return { ...state, data: action.payload, loading: false };
case ActionTypes.LoadDataFailure: // 使用正确的动作类型
return { ...state, error: action.payload, loading: false };
default:
return state;
}
}
通过确保正确定义动作联合类型和正确使用动作类型,可以解决Angular NgRx动作联合类型错误。