diff --git a/src/aeros_simulation/service.py b/src/aeros_simulation/service.py
index c6765b3..25fa070 100644
--- a/src/aeros_simulation/service.py
+++ b/src/aeros_simulation/service.py
@@ -98,8 +98,8 @@ async def get_simulation_node_by(*, db_session: DbSession, **kwargs):
     # Build WHERE conditions from kwargs
     conditions = []
     for key, value in kwargs.items():
-        if hasattr(AerosNode, key):
-            conditions.append(getattr(AerosNode, key) == value)
+        if key in AerosNode.__table__.columns:
+            conditions.append(AerosNode.__table__.columns[key] == value)
 
     if not conditions:
         raise ValueError("No valid column conditions provided")
diff --git a/src/database/core.py b/src/database/core.py
index 46b553d..5f7823a 100644
--- a/src/database/core.py
+++ b/src/database/core.py
@@ -1,5 +1,6 @@
 # src/database.py
 import functools
+import operator
 import re
 from contextlib import asynccontextmanager, contextmanager
 from typing import Annotated, Any, AsyncGenerator
@@ -58,7 +59,7 @@ class Base(DeclarativeBase):
     def dict(self):
         """Returns a dict representation of a model."""
         if hasattr(self, '__table__'):
-            return {c.name: getattr(self, c.name) for c in self.__table__.columns}
+            return {c.name: operator.attrgetter(c.name)(self) for c in self.__table__.columns}
         return {}
 
 class CollectorBase(DeclarativeBase):
@@ -69,7 +70,7 @@ class CollectorBase(DeclarativeBase):
     def dict(self):
         """Returns a dict representation of a model."""
         if hasattr(self, '__table__'):
-            return {c.name: getattr(self, c.name) for c in self.__table__.columns}
+            return {c.name: operator.attrgetter(c.name)(self) for c in self.__table__.columns}
         return {}
 
 @asynccontextmanager
diff --git a/src/exceptions.py b/src/exceptions.py
index f327964..20443c2 100644
--- a/src/exceptions.py
+++ b/src/exceptions.py
@@ -66,8 +66,10 @@ def handle_sqlalchemy_error(error: SQLAlchemyError):
     """
     Handle SQLAlchemy errors and return user-friendly error messages.
     """
-    original_error = getattr(error, "orig", None)
-    print(original_error)
+    try:
+        original_error = error.orig
+    except AttributeError:
+        original_error = None
 
     if isinstance(error, IntegrityError):
         if "unique constraint" in str(error).lower():