framework/rbac/DbManager.php
protected function removeRule($rule)
    {
        if (!$this->supportsCascadeUpdate()) {
            $this->db->createCommand()
                ->update($this->itemTable, ['rule_name' => null], ['rule_name' => $rule->name])
                ->execute();
        }

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

        $this->invalidateCache();

        return true;
    }
protected function removeRule($rule)
    {
        if (!$this->supportsCascadeUpdate()) {
            $this->db->createCommand()
                ->update($this->itemTable, ['rule_name' => null], ['rule_name' => $rule->name])
                ->execute();
        }

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

        $this->invalidateCache();

        return true;
    }
{@inheritdoc}