protected function populateCreatedAt() { Table2Query::create()->deleteAll(); $ts = new PropelObjectCollection(); $ts->setModel('Table2'); for ($i = 0; $i < 10; $i++) { $t = new Table2(); $t->setTitle('CreatedAt' . $i); $t->setCreatedAt(time() - $i * 24 * 60 * 60 - 30); $ts[] = $t; } $ts->save(); }