reconstruction of the project

app/Models/PaymentError.php

@@ -6,8 +6,11 @@ use App\Models\BaseModel;
 
 class PaymentError extends BaseModel
 {
-    protected $table = 'payment_error'; // The DB table
-    protected $primaryKey = 'id';            // Primary key
+    protected $table = 'payment_error';
+
+    // CI: useTimestamps = false (logged_at managed manually)
+    public $timestamps = false;
+
     protected $fillable = [
         'payment_id',
         'invoice_id',
@@ -22,12 +25,28 @@ class PaymentError extends BaseModel
         'semester',
     ];
 
-        public $timestamps = false;        // We'll manage logged_at manually
-    protected $validationRules = [
-    'wrong_paid_amount' => 'required|decimal',
-    'payment_id' => 'required|integer',
-    'invoice_id' => 'required|integer',
-    'parent_id' => 'required|integer'
-];
+    protected $casts = [
+        'payment_id'         => 'integer',
+        'invoice_id'         => 'integer',
+        'parent_id'          => 'integer',
+        'wrong_paid_amount'  => 'decimal:2',  // adjust precision if needed
+        'logged_by'          => 'integer',
+        'logged_at'          => 'datetime',
+    ];
 
-}
+    /* Optional relationships */
+    public function invoice()
+    {
+        return $this->belongsTo(Invoice::class, 'invoice_id');
+    }
+
+    public function parent()
+    {
+        return $this->belongsTo(User::class, 'parent_id');
+    }
+
+    public function logger()
+    {
+        return $this->belongsTo(User::class, 'logged_by');
+    }
+}