the trait FromRequest<'_> is not implemented for `rocket::State

[sagarnayak]

db_pool.rs

use postgres::NoTls;
use r2d2_postgres::PostgresConnectionManager;
use r2d2_postgres::r2d2::Pool;

pub struct DbPool {
	pub database: Pool<PostgresConnectionManager<NoTls>>,
}

db pool creation -

use postgres::NoTls;
use r2d2_postgres::PostgresConnectionManager;
use r2d2_postgres::r2d2::Pool;

use crate::config_controller::ConfigData;
use crate::core::database::db_pool::DbPool;

fn get_pool() -> Pool<PostgresConnectionManager<NoTls>> {
	let config = ConfigData::new().expect("Failed to get config data");
	let database = config.database;

	let host = database.host;
	let port = database.port;
	let user = database.user;
	let password = database.password;
	let pool_size = database.pool_size;

	let manager = PostgresConnectionManager::new(
		format!("host={} port={} user={} password={}", host, port, user, password).parse().unwrap(),
		NoTls,
	);

	Pool::builder().max_size(pool_size).build(manager).unwrap()
}

pub fn get_db_pools() -> DbPool {
	DbPool {
		database: get_pool()
	}
}

putting it in rocket configuration and putting the state -

extern crate r2d2;
#[macro_use]
extern crate rocket;

use controllers::routes;

use crate::core::database::database_master;

mod core;
mod controllers;
mod model;

mod config_controller;

#[launch]
fn rocket() -> _ {
	rocket::build()
		.mount("/", routes::get_routes())
		.manage(
			database_master::get_db_pools()
		)
}

Getting the state -

use rocket::serde::json::Json;
use rocket::State;

use crate::core::database::db_pool::DbPool;
use crate::model::status_message::StatusMessage;
use crate::model::user::User;

#[get("/getUsers")]
pub fn get_all_user(db_pool: State<DbPool>) -> String {
	let mut db = db_pool.database.get().unwrap();

	"testing".to_string()
}

Now on cargo build, I get this error -

error[E0277]: the trait bound `rocket::State<DbPool>: FromRequest<'_>` is not satisfied
   --> src\controllers\database_connected.rs:9:30
	|
9   | pub fn get_all_user(db_pool: State<DbPool>) -> String {
	|                              ^^^^^^^^^^^^^ the trait `FromRequest<'_>` is not implemented for `rocket::State<DbPool>`
	|
   ::: C:\Users\SAGAR\.cargo\registry\src\github.com-1ecc6299db9ec823\rocket-0.5.0-rc.1\src\request\from_request.rs:383:48
	|
383 |     async fn from_request(request: &'r Request<'_>) -> Outcome<Self, Self::Error>;
	|                                                -- required by this bound in `from_request`
	|
	= help: the following implementations were found:
			  <&'r rocket::State<T> as FromRequest<'r>>

Any suggestion?

[sagarnayak]

My bad.

I had to use

pub fn get_all_user(db_pool: &State<DbPool>) -> String {

https://rocket.rs/v0.5-rc/guide/state/#retrieving-state