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I think I solved

I move assets folder to root dir

https://github.com/casbin-rs/diesel-adapter

use diesel_adapter::casbin::prelude::*;
use diesel_adapter::DieselAdapter;
use dotenvy::dotenv;
use std::env;

pub async fn init() -> Result<()> {
    dotenv().ok();
    let m = DefaultModel::from_file("assets/order_create.conf").await?;
    let database_url = env::var("DATABASE_URL").expect("DATABASE_URL must be set");
    let pool_size = env::var("DATABASE_POOL_SIZE").expect("DATABASE_POOL_SIZE must be set");
    let a = DieselAdapter::new(
        database_url,
        pool_size
            .parse::<u32>()
            .expect("pool size must be a number"),
    )?;
    let mut e = Enforcer::new(m, a).await?;
    e.add_policy(vec![
        String::from("upstream_boss"),
        String::from("agent"),
        String::from("upstream_boss"),
        String::from("agent"),
        String::from("upstream_boss"),
    ])
    .await?;
    e.save_policy().await?;
    Ok(())
}
DATABASE_URL=postgresql://localhost:5432/postgres
DATABASE_POOL_SIZE=4