node.js - Mongoose: Sort by latest Comment.creationDate in comments array of a forum post -

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i have following object

    let threadschema = mongoose.schema({   author: {     type: mongoose.schema.types.objectid,     required: true,     ref: 'user'   },    title: {     type: string,     required: true   },    content: {     type: string,     required: true   },    id: {     type: number,     required: true,     unique: true   },    answers: [{     type: mongoose.schema.types.objectid,     default: [],     ref: 'answer'   }] })

like can see, array of answer objects:

let answerschema = mongoose.schema({   thread: {     type: mongoose.schema.types.objectid, // article     required: true,     ref: 'thread'   },    author: {     type: mongoose.schema.types.objectid,  // user     required: true,     ref: 'user'   },    creationdate: {     type: date,     required: true   },    content: {     type: string,     required: true   } })

and want is, in mongoose query db, sort threads ones latest (newest) answers in them.

i tried stupid as:

thread    .find()   .populate('answers')   .sort('answers.creationdate')   .then((threads) => {     console.log(threads)   })

but no luck that. can proper expertise guide me in right way , tell me if i'm trying @ possible? in advance :)

try putting sort in populate step if sort answers subdocument array inside thread

thread    .find()   .populate({ path: 'answers', options: { sort: { 'creationdate': : -1 } } })   .then((threads) => {     console.log(threads)   })

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