解决Laravel 8 undefined variable错误问题

具体问题：

Laravel 8 使用mailable发送邮件，undefined variable错误？

Laravel 8 使用 mailable 的方法发送邮件，一直出现 undefined variable 的错误，但是参照网上的解决方案，使用 public 定义 variable，但是还是报同样的错误

  public $jobdocumentmessage;
    /**
     * Create a new message instance.
     *
     * @return void
     */
    public function __construct($jobdocumentmessage)
    {
        $this->jobdocumentmessage = $jobdocumentmessage;
    }
    /**
     * Build the message.
     *
     * @return $this
     */
    public function build()
    {
        #dd($jobdocumentmessage);
        return $this->view('emails.jobDocument')
                    ->with([
                        'body' => $jobdocumentmessage->body,
                        'user' => $jobdocumentmessage->user,
                        ])
                    ->subject($jobdocumentmessage->subject)
                    ->replyTo($jobdocumentmessage->mail)
                    ->attach($jobdocumentmessage->url, ['as' => $jobdocumentmessage->name
                ]);
    }

解决办法：

  public $jobdocumentmessage;

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

    /**
     * Build the message.
     *
     * @return $this
     */
    public function build()
    {
        $jobdocumentmessage= $this->jobdocumentmessage ;
        return $this->view('emails.jobDocument')
                    ->with([
                        'body' => $jobdocumentmessage->body,
                        'user' => $jobdocumentmessage->user,
                        ])
                    ->subject($jobdocumentmessage->subject)
                    ->replyTo($jobdocumentmessage->mail)
                    ->attach($jobdocumentmessage->url, ['as' => $jobdocumentmessage->name
                ]);
    }

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