在Laravel 5.4中在浏览器中预览Mailables时出错

Question

我试图在浏览器中预览Mailables但我收到此错误.

Object of class App\Mail\ExamNotification could not be converted to string

我按照https://laravel.com/docs/master/mail中的所有说明操作,无法找到导致此错误的原因.

这是我的路线文件

Route::get('/mailable', function () {
    $parent = App\Parents::find(2);

    return new App\Mail\ExamNotification($parent);
});

这是App\Mail\ExamNotification.php文件的内容

<?php

namespace App\Mail;

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

use App\Parents;

class ExamNotification extends Mailable
{
    use Queueable, SerializesModels;

    /**
     * The parent instance.
     *
     * @var Parent
     */
    public $parent;

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


    /**
     * Build the message.
     *
     * @return $this
     */
    public function build()
    {
        return $this->from('donot-replay@example.com')
                    ->markdown('emails.exams.notification');
    }
}

这是视图文件的内容

@component('mail::message')
# Introduction
Parent Name is {{ $parent->name }}
The body of your message.

@component('mail::button', ['url' => ''])
Button Text
@endcomponent

Thanks,<br>
{{ config('app.name') }}
@endcomponent

请注意,当我在构造函数内部($ this-> parent)时,我得到了正确的查询对象.但我无法dd($ this-> parent); 内部构建函数(即上面提到的相同错误).

编辑:请注意我也可以使用此功能在我的路径文件中发送邮件

Mail::to('app@example.com')->send(new App\Mail\ExamNotification($parent));

所以也能够

dd(new App\Mail\ExamNotification($parent)); 

没有任何问题,上面的输出是

    ExamNotification {#664 ?
  +parent: Parents {#687 ?}
  +from: []
  +to: []
  +cc: []
  +bcc: []
  +replyTo: []
  +subject: null
  #markdown: null
  +view: null
  +textView: null
  +viewData: []
  +attachments: []
  +rawAttachments: []
  +callbacks: []
  +connection: null
  +queue: null
  +delay: null
}

和dd的输出($ this-> parent); 内部构造函数是

    Parents {#687 ?
  #guard: "parent"
  #table: "parents"
  #dates: array:1 [?]
  #fillable: array:7 [?]
  #hidden: array:2 [?]
  #connection: "mysql"
  #primaryKey: "id"
  #keyType: "int"
  +incrementing: true
  #with: []
  #withCount: []
  #perPage: 15
  +exists: true
  +wasRecentlyCreated: false
  #attributes: array:15 [?
    "id" => 2
    "name" => "James Kurian"
  ]
  #original: array:15 [?]
  #casts: []
  #dateFormat: null
  #appends: []
  #events: []
  #observables: []
  #relations: []
  #touches: []
  +timestamps: true
  #visible: []
  #guarded: array:1 [?]
  #forceDeleting: false
  #rememberTokenName: "remember_token"
  #forceDeleting: false
}

所以很明显,问题只在于预览邮件而不是发送邮件.

请告诉我我在哪里弄错了,并提前感谢.

Answer 1

你遇到这个问题的原因是因为渲染Mailables的能力只在Laravel 5.5中引入.

你应该能够自己实现这个功能,只需添加到ExamNotification:

public function render()
{
    $this->build();

    if ($this->markdown) {
        return $this->buildMarkdownView()['html'];
    }

     return view($this->buildView(), $this->buildViewData());
}

您需要更新Route以调用render()方法:

Route::get('/mailable', function () {
    $parent = App\Parents::find(2);

    return (new App\Mail\ExamNotification($parent))->render();
});

我只用几个场景对它进行了测试,但似乎工作正常.