cgen: allow ORM to work with DB aliases (#16939)

Author: Delta456

vlib/sqlite/sqlite_test.v

@@ -1,5 +1,34 @@
 import sqlite
 
+type Connection = sqlite.DB
+
+struct User {
+pub:
+	id   int    [primary; sql: serial]
+	name string
+}
+
+type Content = []u8 | string
+
+struct Host {
+pub:
+	db Connection
+}
+
+fn (back Host) get_users() []User {
+	return []
+}
+
+fn create_host(db Connection) Host {
+	sql db {
+		create table User
+	}
+
+	return Host{
+		db: db
+	}
+}
+
 fn test_sqlite() {
 	$if !linux {
 		return
@@ -56,3 +85,8 @@ fn test_can_access_sqlite_result_consts() {
 	assert sqlite.sqlite_row == 100
 	assert sqlite.sqlite_done == 101
 }
+
+fn test_alias_db() {
+	create_host(sqlite.connect(':memory:')!)
+	assert true
+}

vlib/v/ast/table.v

@@ -735,6 +735,12 @@ pub fn (t &Table) get_type_name(typ Type) string {
 	return sym.name
 }
 
+[inline]
+pub fn (t &Table) get_final_type_name(typ Type) string {
+	sym := t.final_sym(typ)
+	return sym.name
+}
+
 [inline]
 pub fn (t &Table) unalias_num_type(typ Type) Type {
 	sym := t.sym(typ)

vlib/v/gen/c/auto_str_methods.v

@@ -239,6 +239,8 @@ fn (mut g Gen) gen_str_for_result(typ ast.Type, styp string, str_fn_name string)
 
 fn (mut g Gen) gen_str_for_alias(info ast.Alias, styp string, str_fn_name string) {
 	parent_str_fn_name := g.get_str_fn(info.parent_type)
+	_, str_method_expects_ptr, _ := g.table.sym(info.parent_type).str_method_info()
+
 	$if trace_autostr ? {
 		eprintln('> gen_str_for_alias: ${parent_str_fn_name} | ${styp} | ${str_fn_name}')
 	}
@@ -248,7 +250,11 @@ fn (mut g Gen) gen_str_for_alias(info ast.Alias, styp string, str_fn_name string
 	g.definitions.writeln('static string indent_${str_fn_name}(${styp} it, int indent_count); // auto')
 	g.auto_str_funcs.writeln('static string indent_${str_fn_name}(${styp} it, int indent_count) {')
 	g.auto_str_funcs.writeln('\tstring indents = string_repeat(_SLIT("    "), indent_count);')
-	g.auto_str_funcs.writeln('\tstring tmp_ds = ${parent_str_fn_name}(it);')
+	if str_method_expects_ptr {
+		g.auto_str_funcs.writeln('\tstring tmp_ds = ${parent_str_fn_name}(&it);')
+	} else {
+		g.auto_str_funcs.writeln('\tstring tmp_ds = ${parent_str_fn_name}(it);')
+	}
 	g.auto_str_funcs.writeln('\tstring res = str_intp(3, _MOV((StrIntpData[]){
 		{_SLIT0, ${c.si_s_code}, {.d_s = indents }},
 		{_SLIT("${clean_type_v_type_name}("), ${c.si_s_code}, {.d_s = tmp_ds }},

vlib/v/gen/c/sql.v

@@ -835,11 +835,11 @@ fn (mut g Gen) parse_db_type(expr ast.Expr) SqlType {
 	match expr {
 		ast.Ident {
 			if expr.info is ast.IdentVar {
-				return g.parse_db_from_type_string(g.table.get_type_name(expr.info.typ))
+				return g.parse_db_from_type_string(g.table.get_final_type_name(expr.info.typ))
 			}
 		}
 		ast.SelectorExpr {
-			return g.parse_db_from_type_string(g.table.get_type_name(expr.typ))
+			return g.parse_db_from_type_string(g.table.get_final_type_name(expr.typ))
 		}
 		else {
 			return .unknown