chore: initial commit of existing codebase

app/Models/PurchaseOrder.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class PurchaseOrder extends Model
+{
+    use HasFactory;
+
+    protected $fillable = ['po_number', 'supplier_id', 'purchase_request_id', 'po_date', 'expected_delivery_date', 'total_amount', 'status', 'notes', 'created_by'];
+
+    protected $casts = [
+        'po_date' => 'date',
+        'expected_delivery_date' => 'date',
+        'total_amount' => 'decimal:2',
+    ];
+
+    public function supplier()
+    {
+        return $this->belongsTo(Supplier::class);
+    }
+
+    public function purchaseRequest()
+    {
+        return $this->belongsTo(PurchaseRequest::class);
+    }
+
+    public function items()
+    {
+        return $this->hasMany(PurchaseOrderItem::class);
+    }
+
+    public function goodsReceiptNotes()
+    {
+        return $this->hasMany(GoodsReceiptNote::class);
+    }
+
+    public function supplierInvoices()
+    {
+        return $this->hasMany(SupplierInvoice::class);
+    }
+
+    public function createdBy()
+    {
+        return $this->belongsTo(\App\Models\User::class, 'created_by');
+    }
+}