How to sample from normalized forms in Mongoose?

Question

MongoDB

How to select all articles with a certain tag label if the Article model instances contain only an array with the id's of the corresponding Tag model instances?

articleSchema.statics.list = function ({tag, sort, limit, skip}) {

    return this
        .find({
            ??????????????? 'tags.label': tag  ???????????
        })
        .sort('-' + sort)
        .skip(parseInt(skip))
        .limit(parseInt(limit))
        .populate('tags')
        .exec()
};

Article Model

const articleSchema = new mongoose.Schema({
    title: {
        type: String,
        required: true
    },

    body: {
        type: String,
        required: true
    },

    tags: [{
        type: Types.ObjectId,
        ref: 'Tag'
    }],

}, {timestamps: true});

Tag Model

const tagSchema = new mongoose.Schema({

    label: {
        type: String,
        required: true,
        //default: 'untagged'
    },
    articleId:[{
        type: Types.ObjectId,
        ref : 'Article'
    }],

},{timestamps: true});

Answer 1

As far as I know, it is impossible to make such a search in one query in mongo - since joins are not supported, the search can only go within the same collection.
Try to reconsider the approach, for example, denormalize the data and make another collection to associate articles with tags. Or start from tags, not from collections - that is, tags can contain links to those articles that use them.