'datetime', 'recorded_at' => 'datetime', ]; } public function order(): BelongsTo { return $this->belongsTo(MarOrder::class, 'mar_order_id'); } public function visit(): BelongsTo { return $this->belongsTo(Visit::class, 'visit_id'); } public function patient(): BelongsTo { return $this->belongsTo(Patient::class, 'patient_id'); } public function careUnit(): BelongsTo { return $this->belongsTo(CareUnit::class, 'care_unit_id'); } }