使用数据库中的值进行动态邮件配置 [Laravel]

I have created a service provider in my Laravel Application SettingsServiceProvider. This caches the settings table from the database.

$settings = $cache->remember('settings', 60, function() use ($settings)
    {
        return $settings->pluck('value', 'name')->all();
    });

config()->set('settings', $settings);

settings table:

我能够像这样回应表格中的值:

{{ config('settings.sitename') }}  //returns Awesome Images

这在App\Http\Controllers中的任何Blade 文件或控制器上都工作得很好

Problem:

我试着像下面这样将值回复到App\config\mail.php:

'driver' => config('settings.maildriver'),
'host' => config('settings.mailhost'),

But I'm getting this error:

Missing argument 1 for Illuminate\Support\Manager::createDriver()

Update:

我已经创建了一个新的服务Provider MailServiceProvider来覆盖邮件中的设置.比如:

<?php

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use Config;

class MailServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap the application services.
     *
     * @return void
     */
    public function boot()
    {
        //
    }

    /**
     * Register the application services.
     *
     * @return void
     */
    public function register()
    {
        Config::set('mail.driver', config('settings.maildriver'));
        Config::set('mail.host', config('settings.mailhost'));
        Config::set('mail.port', config('settings.mailport'));
        Config::set('mail.encryption', config('settings.mailencryption'));
        Config::set('mail.username', config('settings.mailusername'));
        Config::set('mail.password', config('settings.mailpassword'));

    }
}

But still I am getting the same error!!

Is there any way to override default mail configuration (in app/config/mail.php) on-the-fly (e.g. configuration is stored in database) before swiftmailer transport is created?