Laravel 5.4 Comma Separated Email Validation (Transforming Data)

EmailRequest.php

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class EmailRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }

    /**
     * @inheritDoc
     */
    protected function prepareForValidation()
    {
        $this->merge(['email' => explode(',', $this->email)]);
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'email' => 'required|bail|array',
            'email.*' => 'email'
        ];
    }

    public function messages()
    {
        return [
            'email.*' => ':attribute is not a valid email address'
        ];
    }

    public function attributes()
    {
        $attributes = array();
        foreach ($this->email as $index=>$email) {
            $attributes['email.'.$index] = $email;
        }

        return $attributes;
    }
    
    /**
     * This is part of an API which should only
     * return JSON
     */
    public function wantsJson()
    {
        return true;
    }
}