node.js - How to sort, select and query subdocument in mongoose -


so i'm trying sort subdocument, select , everything. seems can't regular query tried w/ aggregate

mongoose = require("mongoose"); mongoose.connect("localhost:27017", function(err) {   mongoose.connection.db.dropdatabase();   story = mongoose.model("story", {     title: string,     comments: [{       author: string,       content: string     }]   });   sample = new story({     title: "foobar",     comments: [     {       author: "a author",       content: "1 content"     },     {       author: "b author",       content: "2 content"     }     ]   });   sample.save(function(err, doc) {     story.aggregate([         { $match: {             _id: doc._id         }},         { $unwind: "$comments" },         { $project: {"comments": 1}},         { $sort: {"comments.author": -1}}     ], function (err, result) {         if (err) {             console.log(err);             return;         }         console.log(result);     });   }) });

this work:

[ { _id: 541c0f8098f85ac41c240de4,     comments:      { author: 'b author',        content: '2 content',        _id: 541c0f8098f85ac41c240de5 } },   { _id: 541c0f8098f85ac41c240de4,     comments:      { author: 'a author',        content: '1 content',        _id: 541c0f8098f85ac41c240de6 } } ]

but i'd like:

[ { author: 'b author',    content: '2 content',    _id: 541c0f8098f85ac41c240de5 },  { author: 'a author',    content: '1 content',    _id: 541c0f8098f85ac41c240de6 } ]

i use lodash's pluck there way mongodb?

you can change $project reshape output provide structure you're looking for:

story.aggregate([     { $unwind: "$comments" },     { $project: {         author: '$comments.author',         content: '$comments.content',         _id: '$comments._id'     }},     { $sort: {author: -1}} ], function (err, result) { ...

output:

[ { _id: 541c2776149002af52ed3c4a,     author: 'b author',     content: '2 content' },   { _id: 541c2776149002af52ed3c4b,     author: 'a author',     content: '1 content' } ]

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