mongoose关联查询

Question

// 这里是文章
let articleSchema = new Schema({
    title: String,
    content: String
)}
// 这里是评论
let commentSchema = new Schema({
    title: String,
    content: String,
    article: { type: Schema.Types.ObjectId, ref: 'Article' }
)}
var Article = mongoose.model('Article', articleSchema );
var Comment = mongoose.model('Comment', commentSchema );

我想再获取文章列表的时候，再通过文章_id获取该文章下的评论，想了好久”populate“只能从评论查回文章，该怎么搞呢，不可能再文章里面写n个评论的ref吧。感觉不现实啊。难道只能再获取到文章列表里再遍历每篇文章查一次？求解

Answer 1

article 里面可以存储一个comment的_id数组，就可以populate出评论了

let articleSchema = new Schema({
    title: String,
    content: String,
    comments:[{
    type: Schema.Types.ObjectId, ref: 'Comment'
    }]
)}