cake PHP3 アソシエーションsave

前提・実現したいこと

cakePHP3にて、一つの登録フォームで複数テーブル(アソシエーション)に保存したい。

発生している問題・エラーメッセージ

The member could not be saved. Please, try again.
(Controllerの保存処理エラー)

該当のソースコード

MemberController

    public function register()
    {
        $member = $this->Member->newEntity();
        if ($this->request->is('post')) {
            $member = $this->Member->newEntity($this->request->data, [
                'associated' => ['MemberDetail']
                ]);
            if ($this->Member->save($member)) {
                $this->Flash->success(__('The member has been saved.'));

                return $this->redirect(['action' => 'login']);
            }
            $this->Flash->error(__('The member could not be saved. Please, try again.'));
        }
        $this->set(compact('member'));
        $this->set('_serialize', ['member']);
    }

MemberTable

class MemberTable extends Table
{
    public function initialize(array $config)
    {
        parent::initialize($config);

        $this->addBehavior('Timestamp', [
            'events' => [
                'Model.beforeSave' => [
                    'created_at' => 'new',
                    'updated_at' => 'existing',
                ]
            ]
        ]);

        $this->table('member');
        $this->displayField('id');
        $this->primaryKey('id');

        $this->hasMany('AmusementPointHistory', [
            'foreignKey' => 'member_id'
        ]);
        $this->hasMany('MemberDetail', [
            'foreignKey' => 'member_id'
        ]);
        $this->hasMany('MemberDevice', [
            'foreignKey' => 'member_id'
        ]);
        $this->hasMany('TrophyAcquireHistory', [
            'foreignKey' => 'member_id'
        ]);
        $this->belongsToMany('Card', [
            'foreignKey' => 'member_id',
            'targetForeignKey' => 'card_id',
            'joinTable' => 'member_card'
        ]);
    }

    public function validationDefault(Validator $validator)
    {
        $validator
            ->allowEmpty('id', 'create');

        $validator
            ->requirePresence('login_id', 'create')
            ->notEmpty('login_id')
            ->add('login_id', 'unique', ['rule' => 'validateUnique', 'provider' => 'table']);

        $validator
            ->requirePresence('login_password', 'create')
            ->notEmpty('login_password');

        $validator
            ->requirePresence('mail_address', 'create')
            ->notEmpty('mail_address')
            ->add('mail_address', 'unique', ['rule' => 'validateUnique', 'provider' => 'table']);

        $validator
            ->allowEmpty('remainder_hash');

        $validator
            ->dateTime('last_login_at')
            ->allowEmpty('last_login_at');

        $validator
            ->integer('is_active')
            ->requirePresence('is_active', 'create')
            ->notEmpty('is_active');

        $validator
            ->allowEmpty('admin_memo');

        $validator
            ->integer('is_deleted')
            ->requirePresence('is_deleted', 'create')
            ->notEmpty('is_deleted');

        $validator
            ->allowEmpty('created_by');

        $validator
            ->dateTime('created_at')
            ->requirePresence('created_at', 'create')
            ->notEmpty('created_at');

        $validator
            ->allowEmpty('updated_by');

        $validator
            ->dateTime('updated_at')
            ->requirePresence('updated_at', 'create')
            ->notEmpty('updated_at');

        return $validator;
    }

    public function buildRules(RulesChecker $rules)
    {
        $rules->add($rules->isUnique(['login_id']));
        $rules->add($rules->isUnique(['mail_address']));

        return $rules;
    }

    public function updateLastLoginAt($user)
    {
        $data = $this->get($user['id']);
        $data->last_login_at = Time::now();
        $this->save($data);
    }
}

MemberDetailTable

public function initialize(array $config)
    {
        parent::initialize($config);
        $this->addBehavior('Timestamp', [
            'events' => [
                'Model.beforeSave' => [
                    'created_at' => 'new',
                    'updated_at' => 'existing',
                ]
            ]
        ]);

        $this->table('member_detail');
        $this->displayField('id');
        $this->primaryKey('id');

        $this->belongsTo('Member', [
            'foreignKey' => 'member_id',
            'joinType' => 'INNER'
        ]);
    }

    public function validationDefault(Validator $validator)
    {
        $validator
            ->allowEmpty('id', 'create');

        $validator
            ->allowEmpty('nickname');

        $validator
            ->integer('gender')
            ->allowEmpty('gender');

        $validator
            ->date('birthday')
            ->allowEmpty('birthday');

        $validator
            ->integer('country')
            ->allowEmpty('country');

        $validator
            ->integer('prefecture')
            ->allowEmpty('prefecture');

        $validator
            ->integer('language')
            ->allowEmpty('language');

        $validator
            ->allowEmpty('created_by');

        $validator
            ->dateTime('created_at')
            ->requirePresence('created_at', 'create')
            ->notEmpty('created_at');

        $validator
            ->allowEmpty('updated_by');

        $validator
            ->dateTime('updated_at')
            ->requirePresence('updated_at', 'create')
            ->notEmpty('updated_at');

        return $validator;
    }

    public function buildRules(RulesChecker $rules)
    {
        $rules->add($rules->existsIn(['member_id'], 'Member'));

        return $rules;
    }

register.ctp

<div class="member form large-9 medium-8 columns content">
    <?= $this->Form->create($member) ?>
    <fieldset>
        <legend><?= __('新規会員登録') ?></legend>
        <?php
            echo $this->Form->input('member_detail.0.nickname');
            echo $this->Form->select('member_detail.0.gender', [0, 1, 2]);
            echo $this->Form->input('member_detail.0.birthday', ['type' => 'date']);
            echo $this->Form->select('member_detail.0.country', [1, 2, 3, 4, 5]);
            echo $this->Form->select('member_detail.0.prefecture', [1, 2, 3, 4, 5]);
            echo $this->Form->select('member_detail.0.language', [1, 2, 3, 4, 5]);
            echo $this->Form->input('mail_address', ['type' => 'email']);
            echo $this->Form->hidden('login_id', ['type' => 'text']);
            echo $this->Form->input('login_password', ['type' => 'password']);
            echo $this->Form->hidden('remainder_hash');
            echo $this->Form->hidden('last_login_at', ['empty' => true]);
            echo $this->Form->hidden('is_active');
            echo $this->Form->hidden('admin_memo');
            echo $this->Form->hidden('is_deleted');
            echo $this->Form->hidden('created_by');
            echo $this->Form->hidden('created_at');
            echo $this->Form->hidden('updated_by');
            echo $this->Form->hidden('updated_at');
        ?>
    </fieldset>
    <?= $this->Form->button(__('Submit')) ?>
    <?= $this->Form->end() ?>
</div>

試したこと

Viewのバリデーションで引っかかっているのかと思い、入力させたくないフィールドを削除したのですが、変わりませんでした。

補足情報(言語/FW/ツール等のバージョンなど)

php7.1.1 / cake PHP3.3.12/