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