recreate project

app/Models/DiscountUsageModel.php

@@ -0,0 +1,61 @@
+<?php
+
+namespace App\Models;
+
+use CodeIgniter\Model;
+
+class DiscountUsageModel extends Model
+{
+    protected $table = 'discount_usages';
+    protected $primaryKey = 'id';
+    
+    protected $allowedFields = [
+        'voucher_id',
+        'invoice_id',
+        'discount_amount',
+        'school_year',
+        'semester',
+        'updated_by',
+        'parent_id',
+        'used_at'
+    ];
+   
+    // Enable automatic timestamps if desired (optional: only if you add created_at/updated_at columns)
+    protected $useTimestamps = true;
+    protected $createdField = 'created_at';
+    protected $updatedField = 'updated_at';
+
+    // Add validation rules
+    protected $validationRules = [
+        'voucher_id' => 'required|is_natural_no_zero',
+        'invoice_id' => 'required|is_natural_no_zero',
+        'user_id'    => 'permit_empty|is_natural_no_zero',
+        'used_at'    => 'valid_date'
+    ];
+
+    protected $validationMessages = [
+        'voucher_id' => [
+            'required' => 'Voucher ID is required.'
+        ],
+        'invoice_id' => [
+            'required' => 'Invoice ID is required.'
+        ]
+    ];
+
+    public function getTotalDiscountByParentIdAndSchoolYear(int $parentId, string $schoolYear): float
+    {
+        $db = \Config\Database::connect();
+
+        $result = $db->table('discount_usages du')
+            ->selectSum('du.discount_amount', 'total_discount')
+            ->join('invoices i', 'du.invoice_id = i.id')
+            ->where('i.parent_id', $parentId)
+            ->where('i.school_year', $schoolYear)
+            ->get()
+            ->getRowArray();
+
+        return $result && isset($result['total_discount']) ? (float) $result['total_discount'] : 0.00;
+    }
+
+}
+