| // Copyright 2015 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| #![feature(rustc_private)] |
| |
| extern crate serialize; |
| |
| use serialize::{Encodable, Decodable}; |
| use std::fmt::Display; |
| |
| pub trait Entity : Decodable + Encodable + Sized { |
| type Key: Clone + Decodable + Encodable + ToString + Display + Eq + Ord + Sized; |
| |
| fn id(&self) -> Self::Key; |
| |
| fn find_by_id(id: Self::Key) -> Option<Self>; |
| } |
| |
| pub struct DbRef<E: Entity> { |
| pub id: E::Key, |
| } |
| |
| impl<E> DbRef<E> where E: Entity { |
| fn get(self) -> Option<E> { |
| E::find_by_id(self.id) |
| } |
| } |
| |
| fn main() {} |
