protected function deleteConditionSettings(PreDeleteModelEvent $event)
    {
        $environment  = $event->getEnvironment();
        $model        = $event->getModel();
        $dataProvider = $environment->getDataProvider('tl_metamodel_dcasetting_condition');

        $conditions = $dataProvider->fetchAll(
            $dataProvider->getEmptyConfig()->setFilter(
                [['operation' => '=', 'property' => 'attr_id', 'value' => $model->getId()]]
            )
        );

        if ($conditions->count() < 1) {
            return;
        }

        $conditionsGeneral            = new \DC_General($dataProvider->getEmptyModel()->getProviderName());
        $conditionsEnvironment        = $conditionsGeneral->getEnvironment();
        $conditionsDataDefinition     = $conditionsEnvironment->getDataDefinition();
        $conditionsPalettesDefinition = $conditionsDataDefinition->getPalettesDefinition();

        /** @var \Iterator $conditionsIterator */
        $conditionsIterator = $conditions->getIterator();
        while ($currentCondition = $conditionsIterator->current()) {
            $conditionPalette    = $conditionsPalettesDefinition->getPaletteByName(
                $currentCondition->getProperty('type')
            );
            $conditionProperties = $conditionPalette->getVisibleProperties(
                $currentCondition
            );

            foreach ($conditionProperties as $conditionProperty) {
                if ($conditionProperty->getName() !== 'attr_id') {
                    continue;
                }

                $dataProvider->delete($currentCondition);
            }

            $conditionsIterator->next();
        }
    }