RUST find value in web::Data<Arc<>> - rust

Question

my "main" file
mod router;
mod student;
use std::sync::Arc;
use crate::router::init_router;
use crate::router::Memory;
use actix_web::{App, HttpServer};
#[actix_web::main]
async fn main() -> std::io::Result<()> {
dotenv::dotenv().ok();
let repo = Arc::new(Memory::repository());
let host = std::env::var("SERVER.HOST").unwrap_or("127.0.0.1".to_string());
let port = std::env::var("SERVER.PORT").unwrap_or("8080".to_string());
let url = format!("{}:{}", host, port);
println!("url: {}", &url);
HttpServer::new(move || {
App::new()
.data(repo.clone()) // shared
.configure(init_router)
})
.bind(&url)?
.run()
.await
}
my file: "router.rs"
use std::sync::Arc;
use crate::student::Student;
use actix_web::{get, web, HttpResponse, Responder};
use serde::{Serialize, Deserialize};
#[derive(Serialize, Deserialize)]
pub struct Memory {
pub students: Vec<Student>,
}
impl Memory {
fn new() -> Self {
Memory {
students: Vec::new(),
}
}
pub fn repository() -> Self{
Self {
students: vec![
{Student::new("1".to_string(), "Daniel".to_string(), 19)},
{Student::new("2".to_string(), "Lucia".to_string(), 17)},
{Student::new("3".to_string(), "Juan".to_string(), 14)}
]
}
}
}
#[get("/student/list/all")]
async fn list_all(repo: web::Data<Arc<Memory>>) -> impl Responder {
HttpResponse::Ok().json(&***repo)
}
#[get("/student/list/by-id/{id_student}")]
async fn list_by_id(web::Path(id_student): web::Path<String>, repo: web::Data<Arc<Memory>>) -> impl Responder {
HttpResponse::Ok().json(&***repo.students.into_iter().find(|x| *x.id == id_student))
}
pub fn init_router(config: &mut web::ServiceConfig) {
config.service(list_all);
config.service(list_by_id);
}
and my file: "student.rs"
use serde::{Serialize, Deserialize};
#[derive(Serialize, Deserialize)]
pub struct Student{
pub id: String,
pub nombre: String,
pub calificacion: u32,
}
impl Student{
pub fn new(id: String, nombre: String, calificacion: u32) -> Self{
Self{id, nombre, calificacion}
}
}
I want to show a student in the following path: 127.0.0.1:3000/student/list/by-id/1
but i have the following error
error[E0614]: type `std::vec::IntoIter<Student>` cannot be dereferenced
--> src\router.rs:43:33
|
43 | HttpResponse::Ok().json((&***repo.lock().unwrap().students.into_iter()).find(|x| *x.id == id_student))
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error
because I get the error, I don't know what is wrong. Please I need help I am new to this programming language.

Answer 1

The dot operating will smartly dereference the pointer, so the following will compile:
&repo.students.iter().find(|x| *x.id == id_student)
the Arc will be dereferenced when accessing students from repo, which will give a reference to the Vec, and .iter() will give you a non-consuming iterator, which you can then map over (.into_iter() will require the Vec to be copied and consumed)