我使用的是CakePHP 3.3.6和MySQL 5.7.13。
我的数据库中有以下三个表：集合、标记和联接表集合_标记。

集合表

CREATE TABLE IF NOT EXISTS `database`.`collections` (
  `id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `name` VARCHAR(45) NOT NULL,
  `event_date` DATE NOT NULL,
  `url_slug` VARCHAR(45) NOT NULL,
  `status` TINYINT(1) NOT NULL DEFAULT 0,
  `user_id` INT UNSIGNED NOT NULL,
  `created` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `modified` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`, `user_id`),
  INDEX `fk_collections_users1_idx` (`user_id` ASC),
  CONSTRAINT `fk_collections_users1`
    FOREIGN KEY (`user_id`)
    REFERENCES `database`.`users` (`id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
ENGINE = InnoDB

标记表

CREATE TABLE IF NOT EXISTS `database`.`tags` (
  `id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `name` VARCHAR(45) NOT NULL,
  `created` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `modified` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`))
ENGINE = InnoDB

收藏_标签表

CREATE TABLE IF NOT EXISTS `database`.`collections_tags` (
  `id` INT NOT NULL AUTO_INCREMENT,
  `collection_id` INT UNSIGNED NOT NULL,
  `tag_id` INT UNSIGNED NOT NULL,
  PRIMARY KEY (`id`, `collection_id`, `tag_id`),
  INDEX `fk_collections_has_tags_tags1_idx` (`tag_id` ASC),
  INDEX `fk_collections_has_tags_collections1_idx` (`collection_id` ASC),
  CONSTRAINT `fk_collections_has_tags_collections1`
    FOREIGN KEY (`collection_id`)
    REFERENCES `database`.`collections` (`id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_collections_has_tags_tags1`
    FOREIGN KEY (`tag_id`)
    REFERENCES `database`.`tags` (`id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB

在我的表格\集合表格.php中：

public function initialize(array $config)
{
    # A collection hasMany Sets
    $this->hasMany('Sets', [
        'dependent' => True,
    ]);

    # A Collection belongsTo a User
    $this->belongsTo('Users');

    # A Collection belongsToMany Tags
    $this->belongsToMany('Tags');
}

在我表格\TagsTable.php中：

public function initialize(array $config)
{
    # A Tag belongsToMany Collections
    $this->belongsToMany('Collections');
}

我可以获取所有收藏集或所有标签。它可以正常工作。但如果我尝试获取所有收藏集及其关联标签，则会出现以下错误：

当我的“收藏”控制器中有以下内容时，会发生此错误：

class CollectionsController extends AppController
{
    public function index()
    {
        $this->set('collections', $this->Collections->find('all', ['contain' => ['Tags']]));
    }
}

在我的模板\集合\索引.ctp中：

<h1>Hi, this is the Collection > Index page.</h1>

<?php foreach ($collections as $collection): ?>
<p>test</p>
<?php endforeach; ?>

我不知道为什么...我试着创建一个Table\CollectionsTagsTable.php文件，但是没有任何效果。
谢谢你的帮助

EDIT：我尝试按TIMESTAMP更改DATETIME字段，按INT更改TINYINT，但没有任何更改。