laravel 5.4 在邮件中嵌入图像

Question

我刚刚升级了我的 5.2安装 Laravel 到 5.3然后到 5.4按照官方的升级方法。

我现在正在尝试使用其中一项新功能来创建 Markdown 格式的电子邮件。

根据在以下位置找到的文档:https://laravel.com/docs/5.4/mail#view-data

To embed an inline image, use the embed method on the $message variable within your email template. Laravel automatically makes the $message variable available to all of your email templates, so you don't need to worry about passing it in manually:

然而，这:

<img src="{{ $message->embed(public_path().'/img/official_logo.png') }}">

将产生以下错误:

Undefined variable: message

我错过了什么吗？或者升级指南中是否有未记录的内容？

后期编辑:

我正在调用电子邮件功能:
\Mail::to($user)->send(new WelcomeCandidate($user, $request->input('password')));
WelcomeCandidate 看起来像:

<?php

namespace App\Mail;

use Illuminate\Bus\Queueable;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;
use Illuminate\Contracts\Queue\ShouldQueue;

use App\Models\User;

class WelcomeCandidate extends Mailable
{

    use Queueable, SerializesModels;

    public $user;
    public $password;

    /**
     * Create a new message instance.
     *
     * @return void
     */
    public function __construct(User $user, $password)
    {
        //
        $this->user = $user;
        $this->password = $password;
    }

    /**
     * Build the message.
     *
     * @return $this
     */
    public function build()
    {
        $this->subject('Welcome!');
        return $this->markdown('emails.welcome-candidate');
    }
}

Answer 1

似乎旧的 $message->embed 不能很好地处理 Markdown 电子邮件。 Like you mentioned in the comments it seems broken since 5.4

但是你可以在你的 Markdown 电子邮件中像这样尝试:

This is your logo 
![Some option text][logo]

[logo]: {{asset('/img/official_logo.png')}} "Logo"

就像这里所示:
https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet#images

Assets 功能引用: https://laravel.com/docs/5.4/helpers#method-asset