使用 mongoose populate 来显示作者

发布于 2025-01-11 01:34:48 字数 462 浏览 0 评论 0原文

在我的网站上，用户可以添加通知，我希望页面显示通知的作者。

const notices = await Notice.findById(id).populate('author');

在这条路线上，我可以 console.log(notices) 并查看帖子的作者，并且我可以使用 EJS<%= notifications.author.username %> 显示作者

BUUUT 在这条路线上，

const notices = await Notice.find({}).populate('author');

当我 console.log(notices) 时，我可以看到作者，但是当我尝试用 <%= notifications.author.username %> 显示它时我收到一条错误消息，说用户名未定义。

帮助！！！

原文

On my site a user can can add a notice, I want the page to show the author of the notice.

const notices = await Notice.findById(id).populate('author');

On this route I can console.log(notices) and see author of the post, and i can show the author using EJS<%= notices.author.username %>

BUUUT on this route

const notices = await Notice.find({}).populate('author');

I can see the authors when i console.log(notices) but when i try to display it with <%= notices.author.username %> i get an error saying username is undefined.

Help!!!

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故人如初 2025-01-18 01:34:48

由于 notices 是一个数组，您应该通过索引或映射其元素来访问其元素：

// Access the first element if present
if (notices.length > 0) {
    <%= notice[0].author.username %>
}

// OR map its elements
notices.map(notice => <%= notice.author.username %>)

Since notices is an array you should access its elements by index or by mapping its elements:

// Access the first element if present
if (notices.length > 0) {
    <%= notice[0].author.username %>
}

// OR map its elements
notices.map(notice => <%= notice.author.username %>)

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金兰素衣 2025-01-18 01:34:48

const notices = await Notice.findById(id).populate('author');   
const notices2 = await Notice.find({}).populate('author');

上面的路由得到notice作为对象，并得到notices2作为数组，因为将notices作为findBYID的查询获取，并获取notices2作为find的查询。
这就是为什么获取通知获取对象和通知2获取数组。

// notices Object element
<%= notices.author.username %>

//notices2 map elements by display frist authore
if (notices2.length > 0) {
    <%= notices2[0].author.username %>
}
// OR loop for map by display all authore
notices2.map(n => <%= n.author.username %>)

const notices = await Notice.findById(id).populate('author');   
const notices2 = await Notice.find({}).populate('author');

The above route gets noticed as the object and gets notices2 as the array because of getting notices as the query for findBYID and getting notices2 as the query for the find.
That's why getting notices getting object and notices2 getting array.

// notices Object element
<%= notices.author.username %>

//notices2 map elements by display frist authore
if (notices2.length > 0) {
    <%= notices2[0].author.username %>
}
// OR loop for map by display all authore
notices2.map(n => <%= n.author.username %>)

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