ag033

public functions questions(){

        $instance = $this->newRelatedInstance(Question::class);
        $localKey = $this->getKeyName();
        $query = $instance->newQuery()
             ->join('test_question', 'test_question.question_id', '=', 'questions.id')
             ->join('tests', 'tests.id', '=', 'test_question.test_id')
             ->join('lessons', 'lessons.id', '=', 'tests.lesson_id')
             ->join('modules', 'modules.id', '=', 'lessons.module_id')

        return $this->newHasMany(
            $query, $this, 'modules.course_id', $localKey
        );
}