protected function setMultipleRelation($relationName, $value)
    {
        /** @var BaseActiveRecord $owner */
        $owner = $this->owner;
        /** @var ActiveQuery $relation */
        $relation = $owner->getRelation($relationName);
        $newRelations = [];
        if (!is_array($value)) {
            if (!empty($value)) {
                $value = [$value];
            } else {
                $value = [];
            }
        }
        foreach ($value as $entry) {
            if ($entry instanceof $relation->modelClass) {
                $newRelations[] = $entry;
            } else {
                // TODO handle this with one DB request to retrieve all models
                $newRelations[] = $this->processModelAsArray($entry, $relation, $relationName);
            }
        }
        $this->_newRelationValue[$relationName] = $newRelations;
        $owner->populateRelation($relationName, $newRelations);
    }