mongoose lean query and aggregate, virtuals not showing

[Mauricio Mercado]

I have the following schema set up on mongoose, Im using vesrion 3.6.17:

    var PostSchema = new Schema({

        _id: { type: String, required: true, index: { unique: true } },

        video: { type: String, default: ''},

        cover: { type: String, default: ''},

        createdAt: { type: Date, default: Date.now },

        lastUpdate: { type: Date, default: Date.now }

        }, { autoIndex: true, toObject: { virtuals: true }, toJSON: { virtuals: true } });

And the following virtuals: 

    PostSchema.virtual('replied').get(function () {

        return false;

    });

    PostSchema.virtual('cover_url').get(function () {

        return config.cover.server + this.cover;

    });

    PostSchema.virtual('video_url').get(function () {

        return config.video.server + this.video;

    });

When I do an aggregate query:

    Post.aggregate(  { $match:  { replyTo: { $ne: "" }, author: user._id,  draft: false } },

                        { $project: {

                                _id: 1,

                                video: 1,

                                video_url: 1,

                                cover: 1,

                                cover_url: 1,

                                createdAt: 1,

                                lastUpdate: 1,

                                Ireplied : { $not: "$replied"} }

                              }, function ( ) ....

At this point the virtuals return but they return with the attribute this.cover or this.video undefined.

And when I do a Post.findOne(..).lean().populate(...) etc, I dont get the virtuals at all, neither with a Post.find().lean().populate(...)

Am I missing something on the Post schema, to be able to return the virtuals, or am I doing something wrong?

And why with the aggregate operation the virtuals return the value "this.cover" as undefined?

Thank you!

[Aaron Heckmann]

Model.aggregate returns plain objects (without virtuals):

> The documents returned are plain javascript objects, not mongoose documents cast to this models schema definition (since any shape of document can be returned).

http://mongoosejs.com/docs/api.html#model_Model.aggregate

Same for lean() queries, they return plain documents, not mongoose documents.

Mongoose documents have virtuals applied, plain js objects do not.

Also, it doesn't make sense for virtuals to "return" since they do not store any data in the db, they are simply accessors that live in your application.

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