ExerciseManager.php

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<?php

declare(strict_types=1);

namespace ILIAS\Exercise;

class ExerciseManager
{
    public function __construct(
        protected InternalRepoService $repo,
        protected InternalDomainService $domain,
        protected $obj_id
    ) {
    }

    public function delete(
        \ilObjExercise $exc
    ): void {
        // delete assignments
        $ass_manager = $this->domain->assignment()->assignments(
            $this->obj_id,
            0
        );
        foreach ($ass_manager->getAll() as $assignment) {
            $this->domain->assignment()->getAssignment(
                $assignment->getId()
            )->delete($exc, false);
        }

        foreach (\ilExcCriteriaCatalogue::getInstancesByParentId($this->obj_id) as $crit_cat) {
            $crit_cat->delete();
        }
    }
}