[5.2] Fix SparkPost doesn't send attachments

[billmn]

Fix issue #13546.

Here SparkPost's docs on attachments:
https://github.com/SparkPost/sparkpost-api-documentation/blob/master/services/transmissions_api.md#attachment-attributes

[RicardoRamirezR]

Hi there,

After this fix, I'm getting:

Call to undefined method Swift_MimePart::getFileName()
vendor/laravel/framework/src/Illuminate/Mail/Transport/SparkPostTransport.php:68

Going to laravel/framework (v5.2.31) clear the issue

Note: _children is empty

[billmn]

@treserres Can you post your code?
I have used this code and it works fine:

Mail::send('mail', [], function($mail) {
    $mail->to('email@address.ext')->subject('Sparkpost test');
});

Also my test has an empty "_children" array:

[RicardoRamirezR]

Sure, here is:

Route::get('/tm', function () {

    $message = 'Muy buenos días';

    $data = [
        'from_name' => 'rrr',
        'to_name' => 'rrr',
        'body' => $message,
    ];

    Mail::send([
            "emails.you-have-new-notification",
            "emails.you-have-new-notification-plain",
        ],
        $data,
        function ($message) {
            $message
                ->to('rrr@example.com', 'Ricardo')
                ->subject('Ricardo le ha enviado mensaje');
        }
    );
});

[eleftrik]

I have the same issue reported by @treserres

[billmn]

Call to undefined method Swift_MimePart::getFileName()

@treserres This error because the message plain version is in getChildren() array. Soon a fix.

[kezkankrayon]

I have the same issue reported by @treserres.

[taylorotwell]

Does anyone have a fix?

On Sat, May 28, 2016 at 6:00 AM -0700, "kezkankrayon" notifications@github.com wrote:

I have the same issue reported by @treserres.

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[billmn]

@taylorotwell Yes but I'm testing the fix in different cases: billmn@fea984d