Revisionable not creating revision entries for belongsToMany relationships

[commadelimited]

I have a Product model and a Category model. The Product model has a belongsToMany relationship with Category

/**
 * App\Models\Product.
 *
 * @property int $id
 * @property string $name
 * @property string $url
 * @property string $description
 * @property \Illuminate\Support\Carbon|null $created_at
 */
class Product extends Model {
    use RevisionableTrait;

    public $guarded = ['id'];

    public function categories() {
        return $this->belongsToMany(Category::class, 'product_category');
    }
}

/**
 * App\Models\Category.
 *
 * @property int $id
 * @property string|null $parent_category_id
 * @property string $name
 * @property string $description
 */
class Category extends Model {
    public $guarded = ['id'];
    public $timestamps = false;
}

When I save a Product I get the expected results of records inserted into the revisions table. However I'm also like to see records inserted when categories are added or removed. How would I accomplish this given that product_category doesn't have it's own model?

[Taelkir]

I know from your other issue that you aren't looking into this package anymore, but if anyone else comes looking, here's a SO answer with a possible work around for this missing functionality: https://stackoverflow.com/a/37952887/10228954