Question

//Here is the article
 let articleSchema = new Schema({
 title: String,
 content: String
 )}
 //Here are the comments
 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 );

When I want to get the list of articles again, I will get the comments under the article through the article _id. I have thought for a long time that “populate” can only look up the articles from the comments. what should I do? it is impossible to write ref with n comments in the article. It doesn’t feel realistic. Can we only get the list of articles and go through each article again? solve

Answer 1

Article can store a comment _id array, and then can populate comments.

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