1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152

//! Re-export of [`diesel`] with prelude types overridden with `async` variants
//! from [`diesel_async`].
//!
//! # Usage
//!
//! To use `async` `diesel` support provided here, enable the following
//! dependencies in your `Cargo.toml`:
//!
//! ```toml
//! [dependencies]
//! rocket = "0.6.0-dev"
//! diesel = "2"
//!
//! [dependencies.rocket_db_pools]
//! version = "0.1.0"
//! features = ["diesel_mysql"]
//! ```
//!
//! Then, import `rocket_db_pools::diesel::prelude::*` as well as the
//! appropriate pool type and, optionally, [`QueryResult`]. To use macros or
//! `diesel` functions, use `diesel::` directly. That is, _do not_ import
//! `rocket_db_pools::diesel`. Doing so will, by design, cause import errors.
//!
//! # Example
//!
//! ```rust
//! # #[macro_use] extern crate rocket;
//! # #[cfg(feature = "diesel_mysql")] {
//! use rocket_db_pools::{Database, Connection};
//! use rocket_db_pools::diesel::{QueryResult, MysqlPool, prelude::*};
//!
//! #[derive(Database)]
//! #[database("diesel_mysql")]
//! struct Db(MysqlPool);
//!
//! #[derive(Queryable, Insertable)]
//! #[diesel(table_name = posts)]
//! struct Post {
//!     id: i64,
//!     title: String,
//!     published: bool,
//! }
//!
//! diesel::table! {
//!     posts (id) {
//!         id -> BigInt,
//!         title -> Text,
//!         published -> Bool,
//!     }
//! }
//!
//! #[get("/")]
//! async fn list(mut db: Connection<Db>) -> QueryResult<String> {
//!     let post_ids: Vec<i64> = posts::table
//!         .select(posts::id)
//!         .load(&mut db)
//!         .await?;
//!
//!     Ok(format!("{post_ids:?}"))
//! }
//! # }
//! ```

/// The [`diesel`] prelude with `sync`-only traits replaced with their
/// [`diesel_async`] variants.
pub mod prelude {
    #[doc(inline)]
    pub use diesel::prelude::*;

    #[doc(inline)]
    pub use diesel_async::{AsyncConnection, RunQueryDsl, SaveChangesDsl};
}

#[doc(hidden)]
pub use diesel::*;

#[doc(hidden)]
pub use diesel_async::{RunQueryDsl, SaveChangesDsl, *};

#[doc(hidden)]
#[cfg(feature = "diesel_postgres")]
pub use diesel_async::pg;

#[doc(inline)]
pub use diesel_async::pooled_connection::deadpool::Pool;

#[doc(inline)]
pub use diesel_async::async_connection_wrapper::AsyncConnectionWrapper;

#[doc(inline)]
#[cfg(feature = "diesel_mysql")]
pub use diesel_async::AsyncMysqlConnection;

#[doc(inline)]
#[cfg(feature = "diesel_postgres")]
pub use diesel_async::AsyncPgConnection;

/// Alias of a `Result` with an error type of [`Debug`] for a `diesel::Error`.
///
/// `QueryResult` is a [`Responder`](rocket::response::Responder) when `T` (the
/// `Ok` value) is a `Responder`. By using this alias as a route handler's
/// return type, the `?` operator can be applied to fallible `diesel` functions
/// in the route handler while still providing a valid `Responder` return type.
///
/// See the [module level docs](self#example) for a usage example.
///
/// [`Debug`]: rocket::response::Debug
pub type QueryResult<T, E = rocket::response::Debug<diesel::result::Error>> = Result<T, E>;

/// Type alias for an `async` pool of MySQL connections for `async` [diesel].
///
/// ```rust
/// # extern crate rocket;
/// # #[cfg(feature = "diesel_mysql")] {
/// # use rocket::get;
/// use rocket_db_pools::{Database, Connection};
/// use rocket_db_pools::diesel::{MysqlPool, prelude::*};
///
/// #[derive(Database)]
/// #[database("my_mysql_db_name")]
/// struct Db(MysqlPool);
///
/// #[get("/")]
/// async fn use_db(mut db: Connection<Db>) {
///     /* .. */
/// }
/// # }
/// ```
#[cfg(feature = "diesel_mysql")]
pub type MysqlPool = Pool<AsyncMysqlConnection>;

/// Type alias for an `async` pool of Postgres connections for `async` [diesel].
///
/// ```rust
/// # extern crate rocket;
/// # #[cfg(feature = "diesel_postgres")] {
/// # use rocket::get;
/// use rocket_db_pools::{Database, Connection};
/// use rocket_db_pools::diesel::{PgPool, prelude::*};
///
/// #[derive(Database)]
/// #[database("my_pg_db_name")]
/// struct Db(PgPool);
///
/// #[get("/")]
/// async fn use_db(mut db: Connection<Db>) {
///     /* .. */
/// }
/// # }
/// ```
#[cfg(feature = "diesel_postgres")]
pub type PgPool = Pool<AsyncPgConnection>;