mirocow\eav\handlers\MultipleOptionsValueHandler::save PHP Method

    public function save()
    {
        $EavModel = $this->attributeHandler->owner;
        $attribute = $this->attributeHandler->getAttributeName();
        /** @var ActiveRecord $valueClass */
        $valueClass = $EavModel->valueClass;
        $baseQuery = $valueClass::find()->where(['entityId' => $EavModel->entityModel->getPrimaryKey(), 'attributeId' => $this->attributeHandler->attributeModel->getPrimaryKey()]);
        $allOptions = [];
        foreach ($this->attributeHandler->attributeModel->eavOptions as $option) {
            $allOptions[] = $option->getPrimaryKey();
        }
        $query = clone $baseQuery;
        $query->andWhere("optionId NOT IN (:options)");
        $valueClass::deleteAll($query->where, ['options' => implode(',', $allOptions)]);
        // then we delete unselected options
        $selectedOptions = $EavModel->attributes[$attribute];
        if (!is_array($selectedOptions)) {
            $selectedOptions = [];
        }
        $deleteOptions = array_diff($allOptions, $selectedOptions);
        $query = clone $baseQuery;
        $query->andWhere("optionId IN (:options)");
        $valueClass::deleteAll($query->where, ['options' => implode(',', $deleteOptions)]);
        // third we insert missing options
        foreach ($selectedOptions as $id) {
            $query = clone $baseQuery;
            $query->andWhere(['optionId' => $id]);
            $valueModel = $query->one();
            if (!$valueModel instanceof ActiveRecord) {
                /** @var ActiveRecord $valueModel */
                $valueModel = new $valueClass();
                $valueModel->entityId = $EavModel->entityModel->getPrimaryKey();
                $valueModel->attributeId = $this->attributeHandler->attributeModel->getPrimaryKey();
                $valueModel->optionId = $id;
                if (!$valueModel->save()) {
                    throw new \Exception("Can't save value model");
                }
            }
        }
    }