fix del customer and phone number feild

admin_panel/models.py

@@ -58,9 +58,12 @@ class Customer(models.Model):
         self.save()
 
 class PhoneNumber(models.Model):
-    customer = models.ForeignKey(Customer, on_delete=models.CASCADE)
-    phone_number = models.CharField(max_length=11)
-
+    customer = models.ForeignKey(Customer, on_delete=models.CASCADE, related_name='phones')
+    title = models.CharField(max_length=50, default='تلفن', blank=True, null=True, help_text="عنوان شماره (مثل: موبایل پدر)")
+    phone_number = models.CharField(max_length=20) 
+    
+    def __str__(self):
+        return f"{self.title}: {self.phone_number}"
 
 class StoreRoom(models.Model):
     class Meta: