diff --git a/crudkit/core/base.py b/crudkit/core/base.py
index c7de93e..0540ec0 100644
--- a/crudkit/core/base.py
+++ b/crudkit/core/base.py
@@ -10,7 +10,13 @@ class CRUDMixin:
     updated_at = Column(DateTime, default=func.now(), onupdate=func.now())
 
     def as_dict(self):
-        return {c.name: getattr(self, c.name) for c in self.__table__.columns}
+        # Combine all columns from all inherited tables
+        result = {}
+        for cls in self.__class__.__mro__:
+            if hasattr(cls, "__table__"):
+                for column in cls.__table__.columns:
+                    result[column.name] = getattr(self, column.name)
+        return result
 
 class Version(Base):
     __tablename__ = "versions"
diff --git a/crudkit/core/service.py b/crudkit/core/service.py
index 98b6c86..a7da4e5 100644
--- a/crudkit/core/service.py
+++ b/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
 
@@ -15,8 +15,16 @@ class CRUDService(Generic[T]):
         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:
@@ -24,7 +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:
diff --git a/muck/app.py b/muck/app.py
index f419bf5..60d7d3f 100644
--- a/muck/app.py
+++ b/muck/app.py
@@ -27,7 +27,7 @@ bootstrap_world(session)
 
 app = Flask(__name__)
 
-dbref_service = CRUDService(Dbref, session)
+dbref_service = CRUDService(Dbref, session, polymorphic=True)
 exit_service = CRUDService(Exit, session)
 player_service = CRUDService(Player, session)
 program_service = CRUDService(Program, session)
@@ -42,4 +42,4 @@ app.register_blueprint(generate_crud_blueprint(Room, room_service), url_prefix="
 app.register_blueprint(generate_crud_blueprint(Thing, thing_service), url_prefix="/api/things")
 
 if __name__ == "__main__":
-    app.run(debug=True)
+    app.run(debug=True, port=5050)