iopull

/**
     * @return \yii\db\ActiveQuery
     */
    public function getCategories()
    {
        return $this->hasMany(Category::className(), ['id' => 'category_id'])->viaTable(ProductCategory::tableName(), ['product_id' => 'id']);
    }

    /**
     * @param $value
     */
    public function setCategories($value)
    {
        $this->categories = $value;
    }