Add base_manager_name to Payment Meta

apps/payment/models.py

@@ -91,10 +91,13 @@ class Payment(PolymorphicModel):
     created_at = models.DateTimeField(auto_now_add=True)
     update_at = models.DateTimeField(auto_now=True)
 
+    non_polymorphic = models.Manager()
+
     class Meta:
         verbose_name = 'Платеж'
         verbose_name_plural = 'Платежи'
         ordering = ('created_at',)
+        base_manager_name = 'non_polymorphic'
 
     def calc_commission(self):
         return self.amount * config.SERVICE_COMMISSION / 100