ActiveRecord where and order on via-table

Question

I have three database table:

product (id, name)

product_has_adv (product,advantage,sort,important)

advantage (id, text)

In ProductModel I def

Answer 1

First you need to create a model named ProductHasAdv for junction table (product_has_adv) using CRUD.

Then create relation in product model and sort it:

  public function getAdvRels()
    {
        return $this->hasMany(ProductHasAdv::className(), ['product' => 'id'])->
        orderBy(['sort' => SORT_ASC]);;
    }

Then create second relationship like this:

public function getAdvantages()
{
    $adv_ids = [];
    foreach ($this->advRels as $adv_rel)
        $adv_ids[] = $adv_rel->advantage;
    return $this->hasMany(Advantage::className(), ['id' => 'advantage'])->viaTable('product_has_adv', ['product' => 'id'])->orderBy([new Expression('FIELD (id, ' . implode(',', $adv_ids) . ')')]);
}

This will sort final result using order by FIELD technique.

Don't forget to add:

use yii\db\Expression;

line to head.