Согласен на обработку персональных данных

restoran_max_bot/max_bot/models.py

@@ -644,9 +644,8 @@ class Qr(models.Model):
 
 
 class PromoCode(models.Model):
-    objects = None
     client = models.ForeignKey(Client, on_delete=models.CASCADE)
-    promo = models.CharField(max_length=50, unique=True)
+    promo = models.CharField(max_length=50)  # без unique=True
     chat_id = models.CharField(max_length=50)
     messenger = models.CharField(max_length=20, default='max')
     used = models.BooleanField(default=False)
@@ -655,3 +654,4 @@ class PromoCode(models.Model):
 
     class Meta:
         db_table = 'lk_promo_code'
+        unique_together = ('promo', 'chat_id', 'client')  # составной уникальный ключ