●プログラム・リスト●

// ※Memberエンティティ

<?php
namespace App\Model\Entity;

use Cake\ORM\Entity;

/**
 * Member Entity.
 *
 * @property int $id
 * @property string $name
 * @property string $mail
 * @property \App\Model\Entity\Message[] $messages
 */
class Member extends Entity
{
    protected $_accessible = [
        '*' => true,
        'id' => false,
    ];
}


// ※Messageエンティティ

<?php
namespace App\Model\Entity;

use Cake\ORM\Entity;

/**
 * Message Entity.
 *
 * @property int $id
 * @property int $members_id
 * @property \App\Model\Entity\Member $member
 * @property string $title
 * @property string $comment
 */
class Message extends Entity
{
    protected $_accessible = [
        '*' => true,
        'id' => false,
    ];
}