Fix a lot of missing relationship information, plus some upstream CRUDKit changes.

crudkit/core/service.py

@@ -1,5 +1,5 @@
 from typing import Type, TypeVar, Generic
-from sqlalchemy.orm import Session
+from sqlalchemy.orm import Session, with_polymorphic
 from crudkit.core.base import Version
 from crudkit.core.spec import CRUDSpec
 
@@ -9,13 +9,22 @@ def _is_truthy(val):
     return str(val).lower() in ('1', 'true', 'yes', 'on')
 
 class CRUDService(Generic[T]):
-    def __init__(self, model: Type[T], session: Session):
+    def __init__(self, model: Type[T], session: Session, polymorphic: bool = False):
         self.model = model
         self.session = session
+        self.polymorphic = polymorphic
         self.supports_soft_delete = hasattr(model, 'is_deleted')
 
+    def get_query(self):
+        if self.polymorphic:
+            poly_model = with_polymorphic(self.model, '*')
+            return self.session.query(poly_model)
+        else:
+            base_only = with_polymorphic(self.model, [], flat=True)
+            return self.session.query(base_only)
+
     def get(self, id: int, include_deleted: bool = False) -> T | None:
-        obj = self.session.get(self.model, id)
+        obj = self.get_query().filter_by(id=id).first()
         if obj is None:
             return None
         if self.supports_soft_delete and not include_deleted and obj.is_deleted:
@@ -23,7 +32,7 @@ class CRUDService(Generic[T]):
         return obj
 
     def list(self, params=None) -> list[T]:
-        query = self.session.query(self.model)
+        query = self.get_query()
 
         if params:
             if self.supports_soft_delete: