framework/rbac/DbManager.php
protected function removeItem($item)
    {
        if (!$this->supportsCascadeUpdate()) {
            $this->db->createCommand()
                ->delete($this->itemChildTable, ['or', '[[parent]]=:name', '[[child]]=:name'], [':name' => $item->name])
                ->execute();
            $this->db->createCommand()
                ->delete($this->assignmentTable, ['item_name' => $item->name])
                ->execute();
        }

        $this->db->createCommand()
            ->delete($this->itemTable, ['name' => $item->name])
            ->execute();

        $this->invalidateCache();

        return true;
    }
protected function removeItem($item)
    {
        if (!$this->supportsCascadeUpdate()) {
            $this->db->createCommand()
                ->delete($this->itemChildTable, ['or', '[[parent]]=:name', '[[child]]=:name'], [':name' => $item->name])
                ->execute();
            $this->db->createCommand()
                ->delete($this->assignmentTable, ['item_name' => $item->name])
                ->execute();
        }

        $this->db->createCommand()
            ->delete($this->itemTable, ['name' => $item->name])
            ->execute();

        $this->invalidateCache();

        return true;
    }
{@inheritdoc}