在React Redux Reducer中更新数组对象
这应该很简单,但是我找不到想要的简单答案。我有一个减速器:
const posts = (state = null, action) => { switch(action.type){
case "PUBLISH_POST":
return state;
case "UNPUBLISH_POST":
return state;
default:
return postList;
}
}
我有一个带有ID
和的帖子列表status
。我正在发送帖子ID,但无法弄清楚将status
单击的项目从0 更新为1
的逻辑。我已经找到了很多半解决方案,但是它们似乎都很冗长和丑陋-在这种情况下,实现它的最短/最佳方法是什么?
示例数据:
{ id:1,
user:"Bob Smith",
content:"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque vulputate mauris vitae diam euismod convallis. Donec dui est, suscipit at dui vitae, sagittis efficitur turpis. ",
status:1
}
回答:
假设您action
是这样的:
{ type: 'UNPUBLISH_POST',
payload: {
id: 1,
user: 'Bob Smith',
content: 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque vulputate mauris vitae diam euismod convallis. Donec dui est, suscipit at dui vitae, sagittis efficitur turpis. ',
status: 1
}
}
只需使用扩展运算符即可:
const posts = (state = null, action) => { switch(action.type){
case "PUBLISH_POST":
case "UNPUBLISH_POST":
const index = this.state.findIndex(post => post.id === action.payload.id)
return [
...state.slice(0, index), // everything before current post
{
...state[index],
status: action.type === 'PUBLISH_POST' ? 1 : 0,
},
...state.slice(index + 1), // everything after current post
]
default:
return postList;
}
}
以上是 在React Redux Reducer中更新数组对象 的全部内容, 来源链接: utcz.com/qa/421678.html