I can't capture the DB reference - postgresql

Question

I'm trying to create an API using Actix-web, async-grahpql and sqlx with postgresql
In the QueryRoot of the async-graphql I am trying to capture the reference of the DB and make the query the database with sqlx, but it gives me an error
let items = Todo::list(&pool).await?;
| ^^^^^ expected struct `sqlx::Pool`, found enum `std::result::Result`
Here I want to capture the reference
use crate::todo::*;
use async_graphql::{Context, FieldResult};
use sqlx::postgres::PgPool;
pub struct QueryRoot;
#[async_graphql::Object]
impl QueryRoot {
async fn todos(&self, ctx: &Context<'_>) -> FieldResult<Vec<Todo>> {
let pool = ctx.data::<PgPool>();
let items = Todo::list(&pool).await?; //<-- This line generates an error
Ok(items)
}
}
Here I define the references
pub fn run(listener: TcpListener, db_pool: PgPool) -> Result<Server, std::io::Error> {
let data_db_pool = Data::new(db_pool);
//GraphQL
let schema = Schema::build(QueryRoot, MutationRoot, EmptySubscription)
.data(data_db_pool.clone()) //<- DB reference
.finish();
let server = HttpServer::new(move || {
App::new()
.app_data(db_pool.clone()) //<- DB reference
.data(schema.clone())
.route("/graphql", web::post().to(graphql))
.route("/graphql", web::get().to(graphql_playground))
})
.listen(listener)?
.run();
Ok(server)
}
What am I doing wrong? The complete code can be found here.

Answer 1

ctx.data::<T>() returns a Result wrapping a reference to T. You probably want.
let pool = ctx.data::<PgPool>()?;
// ^ return on Err, otherwise yield the &PgPool
let items = Todo::list(pool).await?;
// ^^^^ shouldn't need & here