'datetime', 'created_at' => JalaliDatetime::class, 'updated_at' => JalaliDatetime::class, ]; } public function patient(): BelongsTo { return $this->belongsTo(Patient::class); } public function surgeryCenter(): BelongsTo { return $this->belongsTo(SurgeryCenter::class); } public function creator(): BelongsTo { return $this->belongsTo(User::class, 'created_by'); } public function updator(): BelongsTo { return $this->belongsTo(User::class, 'updated_by'); } }