*/ use HasFactory; protected $fillable = ['subject_id', 'name', 'remedial_lesson_id']; public function subject(): BelongsTo { return $this->belongsTo(Subject::class); } public function remedialLesson(): BelongsTo { return $this->belongsTo(Lesson::class, 'remedial_lesson_id'); } public function questions(): HasMany { return $this->hasMany(Question::class); } }