fix: explicit serialization config for ShowRead

backend/schemas.py

@@ -1,6 +1,7 @@
 from typing import Optional, List, Dict, Generic, TypeVar
 from sqlmodel import SQLModel
 from datetime import datetime
+from pydantic import ConfigDict
 
 class UserCreate(SQLModel):
     email: str
@@ -195,11 +196,12 @@ class GroupPostRead(GroupPostBase):
     nicknames: List["PerformanceNicknameRead"] = []
 
 class ShowRead(ShowBase):
+    model_config = ConfigDict(from_attributes=True)
     id: int
     slug: Optional[str] = None
-    vertical: Optional["VerticalSimple"] = None
-    venue: Optional["VenueRead"] = None
-    tour: Optional["TourRead"] = None
+    vertical: Optional[VerticalSimple] = None
+    venue: Optional[VenueRead] = None
+    tour: Optional[TourRead] = None
     tags: List["TagRead"] = []
     performances: List["PerformanceRead"] = []
     notes: Optional[str] = None