Node.js 为收藏中的每个博主选择最新文章
假设我有3个博客。他们每个人都有很多帖子 我想为他们每个人选择最新的帖子 目前我有以下伪代码:Node.js 为收藏中的每个博主选择最新文章,node.js,mongodb,mongoose,Node.js,Mongodb,Mongoose,假设我有3个博客。他们每个人都有很多帖子 我想为他们每个人选择最新的帖子 目前我有以下伪代码: Bloggers.find({name: {$in: ['John','Mike','Arny']}}, (err, bloggers) => { bloggers.forEach( blogger => { blogger.latest_post = Posts.find({author: blogger.name}).sort({date: -1}).limit
Bloggers.find({name: {$in: ['John','Mike','Arny']}}, (err, bloggers) => {
bloggers.forEach( blogger => {
blogger.latest_post = Posts.find({author: blogger.name}).sort({date: -1}).limit(1);
})
displayItSomehow(bloggers);
})
在这里,博客作者的名字就是一个群体的名字。每个组都有很多文档,但根据某些标准,我只需要一个文档
博主收藏如下:
{name: 'John', id: 1},
{name: 'Mike', id: 2},
{name: 'Arny', id: 3}
John: 'Nowadays football became...'
Mike: 'The story of my neighbor starts when...'
Arny: 'Business and success are always were...'
职位收集:
{ title: 'title1', text: 'blablabla', date: 111, author: 1 },
{ title: 'Nowadays football became...', text: 'blablabla', date: 112, author: 1 },
{ title: 'title1', text: 'blablabla', date: 113, author: 2 },
{ title: 'The story of my neighbor starts when...', text: 'blablabla', date: 114, author: 2 },
{ title: 'title1', text: 'blablabla', date: 115, author: 3 },
{ title: 'title1', text: 'blablabla', date: 116, author: 3 },
{ title: 'Business and success are always were...', text: 'blablabla', date: 117, author: 3 }
结果应该是这样的:
{name: 'John', id: 1},
{name: 'Mike', id: 2},
{name: 'Arny', id: 3}
John: 'Nowadays football became...'
Mike: 'The story of my neighbor starts when...'
Arny: 'Business and success are always were...'
那么,我该如何在猫鼬身上解决我的问题呢?一个查询是否可行?查询就是您要查找的:
Bloggers
.find({name: {$in: ['John','Mike','Arny']}})
.populate({
path: 'posts',
options: {
limit: 1,
sort: {date: -1}
}
})
.exec((err, bloggers) => {
displayItSomehow(bloggers);
})
})
这里有一个链接,指向用于填充函数的配置对象的文档:
这只有在您相应地定义了Bloggers
schema时才有效:
var bloggerSchema = Schema({
_id : Number,
name : String,
// all your other fields...
posts: [{ type: Schema.Types.ObjectId, ref: 'Post' }]
});
请将样本集添加到博客作者和帖子中