bugfix: ensure user lookup returns model instance in write_post endpoint

Author: blackyau

src/app/api/v1/posts.py

@@ -24,7 +24,8 @@ async def write_post(
     current_user: Annotated[dict, Depends(get_current_user)],
     db: Annotated[AsyncSession, Depends(async_get_db)],
 ) -> PostRead:
-    db_user = await crud_users.get(db=db, username=username, is_deleted=False, schema_to_select=UserRead)
+    db_user = await crud_users.get(db=db, username=username, is_deleted=False, schema_to_select=UserRead,
+                                   return_as_model=True)
     if db_user is None:
         raise NotFoundException("User not found")