From b4c7c3cd480e626ac78b49ab91a95340ccfef26a Mon Sep 17 00:00:00 2001
From: Melody Horn <melody@boringcactus.com>
Date: Wed, 30 Jun 2021 15:58:48 -0600
Subject: finish inserting save_mut for models

---
 src/db/backend/sqlite.rs | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

(limited to 'src/db/backend')

diff --git a/src/db/backend/sqlite.rs b/src/db/backend/sqlite.rs
index 002d0d3..eb4468c 100644
--- a/src/db/backend/sqlite.rs
+++ b/src/db/backend/sqlite.rs
@@ -1,6 +1,7 @@
 use diesel::connection::Connection as _;
 
 pub use barrel::backend::Sqlite as SqlGenerator;
+pub use diesel::sqlite::Sqlite as Backend;
 pub use diesel::sqlite::SqliteConnection as Connection;
 
 pub struct Database {
@@ -20,3 +21,47 @@ impl Default for Database {
         }
     }
 }
+
+use diesel::{
+    no_arg_sql_function, no_arg_sql_function_body, no_arg_sql_function_body_except_to_sql, QueryId,
+};
+no_arg_sql_function!(
+    last_insert_rowid,
+    diesel::sql_types::BigInt,
+    "Represents the SQL last_insert_rowid() function"
+);
+
+use diesel::{
+    query_builder::{AsQuery, InsertStatement, QueryFragment, QueryId},
+    query_dsl::methods::{FilterDsl, LoadQuery},
+    sql_types::BigInt,
+    Column, Expression, Insertable, Queryable,
+};
+
+pub fn insert_and_retrieve<'a, Row, Table, Id>(
+    to_insert: &'a Row,
+    table: Table,
+    connection: &Connection,
+    id: Id,
+) -> Row
+where
+    &'a Row: Insertable<Table>,
+    Row: Queryable<Table::SqlType, Backend>,
+    Table: diesel::Table + AsQuery + Copy,
+    InsertStatement<Table, <&'a Row as Insertable<Table>>::Values>: QueryFragment<Backend>,
+    <Table as AsQuery>::Query: QueryFragment<Backend>
+        + QueryId
+        + FilterDsl<diesel::expression::operators::Eq<Id, last_insert_rowid>>,
+    Id: Column + Expression<SqlType = BigInt>,
+    <Table as FilterDsl<diesel::expression::operators::Eq<Id, last_insert_rowid>>>::Output:
+        LoadQuery<Connection, Row>,
+{
+    use diesel::prelude::*;
+    to_insert
+        .insert_into(table)
+        .execute(connection)
+        .expect("error saving to database"); // TODO propagate error
+    diesel::QueryDsl::filter(table, id.eq(last_insert_rowid))
+        .get_result(connection)
+        .expect("error loading from database") // TODO propagate error
+}
-- 
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