[英]How to store and update deeply nested structures in ImmutableJS
我正在用react + redux建立一个小博客,但我想不出该如何回复博客文章下的评论。 我正在为一篇看起来像这样的博客帖子获取评论结构。
"[
{"_id":"5676ed8b9104691f3b85b687",
"content":"Lorem",
"creator":"Admin",
"replies":[
{
"_id":"5676ede4b7a9044c3c1d9641",
"content":"Ipsum",
"creator":"Admin",
"replies":[
{
"_id":"5676eec224ab8fe23c7ce4c6",
"content":"Dolor",
"creator":"Admin",
"replies":[]
},
{
"_id":"5676eeda1c0e3d093d1f90a0",
"content":"Sit",
"creator":"Admin",
"replies":[]
}
]
},
{
"_id":"5676ee5b4b03bbac3c1f7544",
"content":"Amet",
"creator":"Admin",
"replies":[]
},
{
"_id":"5676ee91c43c05c63c319ace",
"content":"Sup",
"creator":"Admin",
"replies":[]
}
]},
{...}
]
如何将其存储在ImmutableJS状态下,以便可以基于_id
轻松添加评论的回复? 另外,注释必须是可迭代的,因为之后我会将它们渲染到注释树中,但是只要使用ImmutableJS数据结构,我认为这不会成为问题。 基本上我不知道如何在我的减速器中实现此功能。
[REPLY_COMMENT]: (state, { payload }) => {
const { _id, comment } = payload
let newState = ???
return newState
}
编辑
这是jsbin,显示我要实现的目标。 我只希望能够回复所有评论
你得把这个分解一下。
因此,首先让我们将注释添加到Immutable.Map
state = state.update('coolPostId', post => Immutable.fromJS(comments));
const replyToPostComment = {
_id: '1234',
content: 'Hello',
creator: 'RandomUser',
replies: []
};
现在,在coolPostId
下有一个Immutable.List
,因此您想通过push
新注释来update
该列表:
state = state.update('coolPostId', comment => comment.push(Immutable.fromJS(replyToPostComment)));
这将通过您的第一个测试:
const expected = state.get('coolPostId').last();
expect(expected.toJS()).to.deep.equal(replyToPostComment);
第二部分同样简单,但是您需要映射注释,并检查_id
与您的元数据匹配。
这是您的设置:
const replyComment = {
_id: '5678',
content: 'Wellcome',
creator: 'RandomUser2',
replies: []
};
const reply = {
postId: 'coolPostId',
commentId: '1234',
comment: replyComment
};
下一行取决于将执行_id
检查的函数,
state = state.get(reply.postId)
.map(comment => addReply(comment)(reply));
最后一个难题是addReply
谓词:
const addReply = c => cr => c.get('_id') === cr.commentId ? c
.update('replies', replies => replies.push(Immutable.fromJS(cr.comment)) ) : c;
这是完整的jsbin可供审查
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