Added production order model file

app/Models/ProductionOrder.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class ProductionOrder extends Model
+{
+    use SoftDeletes;
+    protected $fillable = [
+        'plant_id',
+        'item_id',
+        'quantity',
+        'start_date',
+        'end_date',
+        'production_order',
+        'from_serial_number',
+        'to_serial_number',
+    ];
+
+    public function plant()
+    {
+        return $this->belongsTo(Plant::class);
+    }
+
+    public function item()
+    {
+        return $this->belongsTo(Item::class);
+    }
+}