angular - NGXS 状态管理:在调用动作时更改状态并将其保存到 DB
问题描述
我有几部电影,其中一部可以通过 NGXS 状态管理模式进行更新、删除和点赞。
我想更新我的商店以显示是否喜欢电影并将状态保存在数据库中。
更新和删除操作有效,但类似操作无效,我不明白为什么。它无法保存在数据库中。如果有人可以帮助我,我会被卡住。下面是我的代码,谢谢。
db.json
"movies": [
{
"id": 1,
"title": "Avengers Infinity War",
"imageUrl": "https://fakeimg.pl/600x600/000000/fff",
"liked": (here I want to change the status to true or false when clicked)
},
{
"id": 2,
"title": "Avengers Endgame",
"imageUrl": "https://fakeimg.pl/600x600/000000/fff"
}
]
电影.ts
export interface Movie {
id: number;
title: string;
imageUrl: string;
liked: boolean;
}
电影动作.ts
export class UpdateMovie {
static readonly type = '[Movie] UpdateMovie';
constructor(public payload: Movie, public id: number) {}
}
export class DeleteMovie {
static readonly type = '[Movie] DeleteMovie';
constructor(public id: number) {}
}
export class LikeMovie {
static readonly type = '[Movie] LikeMovie';
constructor(public payload: Movie) {}
}
电影服务.ts
updateMovie(payload: Movie, id: number) {
return this.httpClient
.put<Movie>(encodeURI(this.URL_BASE + `movies/${id}`), payload)
}
deleteMovie(id: number) {
return this.httpClient
.delete(encodeURI(this.URL_BASE + `movies/${id}`))
}
likeMovie(payload: Movie) {
return this.httpClient
.post<Movie>(encodeURI(this.URL_BASE + `movies`), payload);
}
电影状态.ts
export class MovieStateModel {
movies: Movie[];
selectedMovie: Movie;
liked: Movie[];
}
@State<MovieStateModel>({
name: 'movies',
defaults: {
movies: [],
selectedMovie: null,
liked: []
}
})
@Action(DeleteMovie)
deleteMovie({ getState, setState }: StateContext<MovieStateModel>, {id}: DeleteMovie) {
return this.movieService.deleteMovie(id).pipe(tap(() => {
const state = getState();
setState({
...state,
movies: state.movies.filter(item => item.id !== id)
});
}));
}
@Action(UpdateMovie)
updateMovie({ getState, setState }: StateContext<MovieStateModel> {payload, id }: UpdateMovie) {
return this.movieService.updateMovie(payload, id).pipe(tap((result) =>
{
const state = getState();
const movieList = [...state.movies];
const movieIndex = movieList.findIndex(item => item.id === id);
movieList[movieIndex] = result;
setState({
...state,
movies: movieList
});
}));
}
@Action(LikeMovie)
LikeMovie({ getState, setState }: StateContext<MovieStateModel>, {payload}: LikeMovie) {
return this.movieService.likeMovie(payload).pipe(tap(() => {
const state = getState();
setState({
...state,
liked: [...state.liked, payload]
});
}));
}
电影列表.component.ts
likeMovie(payload: Movie) {
this.store.dispatch(new LikeMovie(payload));
}
解决方案
欢迎来到 StackOverflow :)
除了服务器错误(克里斯蒂安已经在评论中提到过)之外,似乎在处理LikeMovie
操作时还有一个小错误。
如果您的liked
属性是,boolean
那么您应该确保为其分配了一个布尔值。
setState({
...state,
liked: [...state.liked, payload] <-- assigns an array
});
正确的方法是:
setState({
...state,
liked: payload
});
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