orm: fix order by with custom column name (#22813)

cmd/tools/vtest-self.v

@@ -165,6 +165,7 @@ const skip_with_fsanitize_memory = [
 	'vlib/orm/orm_references_test.v',
 	'vlib/orm/orm_option_array_test.v',
 	'vlib/orm/orm_option_time_test.v',
+	'vlib/orm/orm_order_by_custom_field_test.v',
 	'vlib/db/sqlite/sqlite_test.v',
 	'vlib/db/sqlite/sqlite_orm_test.v',
 	'vlib/db/sqlite/sqlite_comptime_field_test.v',
@@ -261,6 +262,7 @@ const skip_on_ubuntu_musl = [
 	'vlib/orm/orm_references_test.v',
 	'vlib/orm/orm_option_array_test.v',
 	'vlib/orm/orm_option_time_test.v',
+	'vlib/orm/orm_order_by_custom_field_test.v',
 	'vlib/v/tests/orm_enum_test.v',
 	'vlib/v/tests/orm_sub_struct_test.v',
 	'vlib/v/tests/orm_sub_array_struct_test.v',

vlib/orm/orm_order_by_custom_field_test.v

@@ -0,0 +1,37 @@
+import db.sqlite
+
+@[table: 'prefixed_records']
+struct Record {
+	id   int    @[primary; sql: 'CustomId']
+	name string @[sql: 'named_name']
+}
+
+fn test_main() {
+	mut db := sqlite.connect(':memory:')!
+	defer { db.close() or {} }
+
+	prepare(db)!
+
+	last := sql db {
+		select from Record where name == 'first' order by id limit 1
+	}!
+	assert last.len == 1
+	assert last[0].name == 'first'
+}
+
+fn prepare(db sqlite.DB) ! {
+	db.exec('
+  CREATE TABLE prefixed_records (
+    CustomId INTEGER PRIMARY KEY AUTOINCREMENT,
+    named_name TEXT
+  );
+  ')!
+
+	db.exec("
+  INSERT INTO prefixed_records
+    (named_name)
+  VALUES
+    ('first'),
+    ('last');
+  ")!
+}

vlib/v/gen/c/orm.v

@@ -865,7 +865,14 @@ fn (mut g Gen) write_orm_select(node ast.SqlExpr, connection_var_name string, re
 
 	if node.has_order {
 		g.write('.order = _SLIT("')
-		g.expr(node.order_expr)
+		if node.order_expr is ast.Ident {
+			field := g.get_orm_current_table_field(node.order_expr.name) or {
+				verror('field "${node.order_expr.name}" does not exist on "${g.sql_table_name}"')
+			}
+			g.write(g.get_orm_column_name_from_struct_field(field))
+		} else {
+			g.expr(node.order_expr)
+		}
 		g.writeln('"),')
 		if node.has_desc {
 			g.writeln('.order_type = orm__OrderType__desc,')