ladill-care/app/Models/DrugBatch.php

<?php

namespace App\Models;

use App\Models\Concerns\BelongsToOwner;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;

class DrugBatch extends Model
{
    use BelongsToOwner;

    protected $table = 'care_drug_batches';

    protected $fillable = [
        'owner_ref', 'drug_id', 'batch_number', 'expiry_date',
        'quantity_on_hand', 'cost_minor', 'received_at',
    ];

    protected function casts(): array
    {
        return [
            'expiry_date' => 'date',
            'received_at' => 'datetime',
        ];
    }

    public function drug(): BelongsTo
    {
        return $this->belongsTo(Drug::class, 'drug_id');
    }

    public function dispensingRecords(): HasMany
    {
        return $this->hasMany(DispensingRecord::class, 'drug_batch_id');
    }

    public function isExpired(): bool
    {
        return $this->expiry_date !== null && $this->expiry_date->isPast();
    }
}