public function testCustomRef()
{
$a = [];
$p = new \atk4\data\Persistence_Array($a);
$m = new Model($p, ['table' => 'user']);
$m->addRef('archive', function ($m) {
return $m->newInstance(null, ['table' => $m->table . '_archive']);
});
$this->assertEquals('user_archive', $m->ref('archive')->table);
}