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use crate::Connection;
use diesel::r2d2::{ConnectionManager, CustomizeConnection, Error as ConnError, Pool};
#[cfg(feature = "sqlite")]
use diesel::{dsl::sql_query, ConnectionError, RunQueryDsl};
use rocket_contrib::databases::diesel;
pub type DbPool = Pool<ConnectionManager<Connection>>;
// From rocket documentation
// Connection request guard type: a wrapper around an r2d2 pooled connection.
#[database("plume")]
pub struct DbConn(pub Connection);
// Execute a pragma for every new sqlite connection
#[derive(Debug)]
pub struct PragmaForeignKey;
impl CustomizeConnection<Connection, ConnError> for PragmaForeignKey {
#[cfg(feature = "sqlite")] // will default to an empty function for postgres
fn on_acquire(&self, conn: &mut Connection) -> Result<(), ConnError> {
sql_query("PRAGMA foreign_keys = on;")
.execute(conn)
.map(|_| ())
.map_err(|_| {
ConnError::ConnectionError(ConnectionError::BadConnection(String::from(
"PRAGMA foreign_keys = on failed",
)))
})
}
}
#[cfg(test)]
pub(crate) mod tests {
use super::*;
use diesel::Connection as _;
#[derive(Debug)]
pub struct TestConnectionCustomizer;
impl CustomizeConnection<Connection, ConnError> for TestConnectionCustomizer {
fn on_acquire(&self, conn: &mut Connection) -> Result<(), ConnError> {
PragmaForeignKey.on_acquire(conn)?;
Ok(conn.begin_test_transaction().unwrap())
}
}
}