You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: fetch_base_actor.rs
    path of file: ./repos/aardwolf/aardwolf-types/src/operations
    
    the code of the file until where you have to start completion: use aardwolf_models::base_actor::BaseActor;
use diesel::{pg::PgConnection, result::Error as DieselError};
use thiserror::Error;

use crate
    
    fn doesnt_fetch_invalid_base_actor() {
        setup(|conn, persona| {
            let operation = FetchBaseActor(persona.id() + 1);

            assert!(operation.db_action(conn).is_err());
            Ok(())
        })
    }