Add some ORM/Diesel helper macros
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src/helpers.rs
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75
src/helpers.rs
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//! Some ORM helpers
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//!
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//! The macros, types and traits in this module are used to create a simple GraphQL API on top of
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//! models that are in the database.
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#![allow(unused_macros)]
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macro_rules! all {
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($model_name:ident, $conn:expr) => {{
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use diesel::associations::HasTable;
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let table = $crate::models::$model_name::table();
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table.load(&$conn)
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}};
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}
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macro_rules! retrieve {
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($model_name:ident, $primary_key:expr, $conn:expr) => {{
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use diesel::associations::HasTable;
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let table = $crate::models::$model_name::table();
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table.find($primary_key).first(&$conn)
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}};
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}
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macro_rules! create {
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($model_name:ident, $object:expr, $conn:expr) => {{
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use diesel::associations::HasTable;
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use diesel::{ExpressionMethods, QueryDsl, RunQueryDsl, Table};
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let table = $crate::models::$model_name::table();
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let primary_key = table.primary_key();
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$conn.transaction::<$model_name, diesel::result::Error, _>(|| {
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diesel::insert_into(table).values($object).execute(&$conn)?;
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table.order(primary_key.desc()).first(&$conn)
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})
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}};
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}
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macro_rules! update {
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($model_name:ident, $primary_key:expr, $object:expr, $conn:expr) => {{
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use diesel::associations::HasTable;
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let table = $crate::models::$model_name::table();
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$conn.transaction::<_, diesel::result::Error, _>(|| {
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diesel::update(table.find($primary_key))
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.set($object)
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.execute(&$conn)?;
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table.find($primary_key).first(&$conn)
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})
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}};
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}
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macro_rules! destroy {
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($model_name:ident, $primary_key:expr, $conn:expr) => {{
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use diesel::associations::HasTable;
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let table = $crate::models::$model_name::table();
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let result: Result<$model_name, _> = get!($model_name, $primary_key, $conn);
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match result {
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Ok(_) => diesel::delete(table.find($primary_key)).execute(&$conn),
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Err(e) => Err(e),
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}
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}};
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}
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macro_rules! destroy_all {
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($model_name:ident, $conn:expr) => {{
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use diesel::associations::HasTable;
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use diesel::RunQueryDsl;
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let table = $crate::models::$model_name::table();
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diesel::delete(table).execute(&$conn)
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}};
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}
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@ -11,6 +11,9 @@ use rocket::{catchers, routes, Rocket};
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use rocket_contrib::database;
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use rocket_contrib::serve::StaticFiles;
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#[macro_use]
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pub mod helpers;
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pub mod catchers;
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pub mod handlers;
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