Select when autopopulate with refPath

[Palando]

I want to autopopulate with the refPath and make a select in the populate. Since in the refPath is the referenced type, is it possible to select depending on this type? My schema:

const MentionTextSchema = new Schema(
    {
        text: String,
        mentions: [{
            index: Int32,
            length: Int32,
            type: String,
            mentionedThing: {
                type: Object,
                refPath: "mentions.type",
                autopopulate: optionsFunction,
            }
        }]
    }
);

I want to populate the mentions.mentionedThing.type and the type is in mentions.type and can be either a User or a Group. And depending on the type the select shall be different. I tried it with an options functions but I don't know how to access the refPath and if it's possible:

var optionsFunction = function() {
    if(this.GetTheType() === "User") { // how to get the refPath?
        return { select: 'nick_name' };
    }
    else if(this.GetTheType() === "Group") { // how to get the refPath?
        return { select: 'title' };
    }
};

[vkarpov15]

First, your schema has a small problem, make sure you use type: { type: String }, because right now your schema says mentions is an array of strings.

const MentionTextSchema = new Schema(
    {
        text: String,
        mentions: [{
            index: Int32,
            length: Int32,
            type: { type: String },
            mentionedThing: {
                type: Object,
                refPath: "mentions.type",
                autopopulate: optionsFunction,
            }
        }]
    }
);

We don't currently have support for accessing the current options in the autopopulate function but we'll add that for a future release

[Palando]

Thank you for the hint with the type.

And thank you for the clearification with the autopopulate function. That would be great, when you will implement it in the future.

[vkarpov15]

Fix will be in 0.8.1:

const mappingSchema = new Schema({
      city: String,
      offer: {
        type: mongoose.Schema.Types.ObjectId,
        refPath: 'city',
        autopopulate: function(opts) {
          assert.equal(opts.refPath, 'city');
          return opts;
        }
      }
    });

[vkarpov15]

Fixed by https://github.com/mongodb-js/mongoose-autopopulate/commit/a905420a7d350f4fe753ae1e3dcb78be39e97875