src/lib.rs


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#[macro_use]
extern crate diesel;
#[macro_use]
extern crate diesel_codegen;
extern crate dotenv;
extern crate r2d2_diesel;
extern crate r2d2;

use diesel::pg::PgConnection;
use r2d2_diesel::ConnectionManager;
use dotenv::dotenv;
use std::env;

// An alias to the type for a pool of Diesel PostgreSql connections.
type Pool = r2d2::Pool<ConnectionManager<PgConnection>>;

/// Initializes a database pool.
pub fn init_db_pool() -> Pool {
    dotenv().ok();

    let config = r2d2::Config::default();
    let dburl = env::var("DATABASE_URL")
        .expect("DATABASE_URL environment variable must be set");

    let manager = ConnectionManager::<PgConnection>::new(dburl);
    r2d2::Pool::new(config, manager).expect("db pool")
}