Sails 0.10 & Many-to-Many association - Get all associated data, not the first only

Question

I have 2 models with a Many-to-Many association. My code to associate these two models is working well (it create a new collection item_languages__language_items with the corresponding documents inside). But then I have trouble to get all the associated data (languages) of a specific item. I'm using MongoDB.

// Item.js
module.exports = {
    schema: true,
    autoPK: false,
    attributes: {
        uuid: {
            type: 'string',
            primaryKey: true,
            unique: true,
            required: true,
            uuidv4: true
        },
        languages: {
            collection: 'language',
            via: 'items',
            dominant: true
        }
    }
}

// Language.js
module.exports = {
    schema: true,
    autoPK: false,
    attributes: {
        code: {
            type: 'string',
            primaryKey: true,
            required: true,
            minLength: 2,
            maxLength: 2,
            unique: true
        },
        items: {
            collection: 'item',
            via: 'languages'
        }
    }
}

Data stored in the item_languages__language_items collection:

/* 0 */
{
    "language_items" : "es",
    "item_languages" : "69e4f3a3-1247-4a06-ae2d-9df27ac9495b",
    "_id" : ObjectId("5330bcebf8e0b61509c771d5")
}

/* 1 */
{
    "language_items" : "fr",
    "item_languages" : "69e4f3a3-1247-4a06-ae2d-9df27ac9495b",
    "_id" : ObjectId("5330bd26f8e0b61509c771d6")
}

/* 2 */
{
    "language_items" : "en",
    "item_languages" : "69e4f3a3-1247-4a06-ae2d-9df27ac9495b",
    "_id" : ObjectId("5330bedcc076355b09da3ccd")
}

Now in my ItemController.js, I want to get a specific item with all associated languages:

Item
    .findOne({uuid: '69e4f3a3-1247-4a06-ae2d-9df27ac9495b'})
    .populate('languages')
    .exec(function (e, r) {
        console.log(r.toJSON());
    });

But here I get my item with only 1 associated language, when I expected to get the 3 associated languages.

Answer 1

This appears to be a bug in the current beta implementation of sails-mongo which keeps populate from working properly with custom-defined keys. Please post this to the sails-mongo issues forum! In the meantime the only solution appears to be to use the default MongoDB primary keys.