Add order respondes

order/models.py

@@ -251,3 +251,26 @@ class OrderImage(models.Model):
         return f"{self.id}: {self.order}"
 
 
+class OrderRespond(models.Model):
+    create_time = models.DateTimeField(default=datetime.now, editable=False, verbose_name="Время отклика")
+    user = models.ForeignKey(SiteUser, on_delete=models.CASCADE, related_name="respond_user", verbose_name="Пользователь")
+    order = models.ForeignKey(Order, on_delete=models.CASCADE, related_name="respond_order", verbose_name="Заказ")
+
+    class Meta:
+        constraints = [
+            models.UniqueConstraint(
+                fields=['user', 'order'], name='unique_order_respond_user_order'
+            )
+        ]
+
+    def __str__(self):
+        return f"{self.order}: {self.user}"
+
+    def save(self, *args, **kwargs):
+        if Order.objects.get(id=self.order.id) == self.user.id:
+            raise Exception("User can't respond to self order")
+
+        self.full_clean()
+
+        super().save(*args, **kwargs)
+