star-erp/app/Modules/Inventory/Models/InventoryTransferOrder.php

<?php

namespace App\Modules\Inventory\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;
use App\Modules\Core\Models\User;

class InventoryTransferOrder extends Model
{
    use HasFactory;

    protected $fillable = [
        'doc_no',
        'from_warehouse_id',
        'to_warehouse_id',
        'status',
        'remarks',
        'posted_at',
        'created_by',
        'updated_by',
        'posted_by',
    ];

    protected $casts = [
        'posted_at' => 'datetime',
    ];

    protected static function boot()
    {
        parent::boot();

        static::creating(function ($model) {
            if (empty($model->doc_no)) {
                $today = date('Ymd');
                $prefix = 'TRF-' . $today . '-';

                $lastDoc = static::where('doc_no', 'like', $prefix . '%')
                    ->orderBy('doc_no', 'desc')
                    ->first();

                if ($lastDoc) {
                    $lastNumber = substr($lastDoc->doc_no, -2);
                    $nextNumber = str_pad((int)$lastNumber + 1, 2, '0', STR_PAD_LEFT);
                } else {
                    $nextNumber = '01';
                }

                $model->doc_no = $prefix . $nextNumber;
            }
        });
    }

    public function fromWarehouse(): BelongsTo
    {
        return $this->belongsTo(Warehouse::class, 'from_warehouse_id');
    }

    public function toWarehouse(): BelongsTo
    {
        return $this->belongsTo(Warehouse::class, 'to_warehouse_id');
    }

    public function items(): HasMany
    {
        return $this->hasMany(InventoryTransferItem::class, 'transfer_order_id');
    }

    public function createdBy(): BelongsTo
    {
        return $this->belongsTo(User::class, 'created_by');
    }

    public function postedBy(): BelongsTo
    {
        return $this->belongsTo(User::class, 'posted_by');
    }
}