cakePhp保存manyToMany实体

Question

我试图保存与实体B相关联的实体A，但到目前为止没有成功。

原因是当我试图在我的关系表中保存带有关联（实体B）的实体A时，实体B的id被设置但不是实体A的id。

另一种方式也是如此。

这是我的两个实体的代码：

实体A

class UsersTable extends Table
{

/**
 * Initialize method
 *
 * @param array $config The configuration for the Table.
 * @return void
 */
public function initialize(array $config)
{
    parent::initialize($config);

    $this->table('users');
    $this->displayField('name');
    $this->primaryKey('user_id');

    $this->addBehavior('Timestamp');

    $this->belongsToMany('Shelves', [
        'className' => 'Shelves',
        'foreignKey' => 'shelf_id',
        'targetForeignKey' => 'shelf_id',
        'joinTable' => 'shelvesSalesmen',
        'through' => 'ShelvesSalesmen'
    ]);
}
}

实体B

class ShelvesTable extends Table
{

/**
 * Initialize method
 *
 * @param array $config The configuration for the Table.
 * @return void
 */
public function initialize(array $config)
{
    parent::initialize($config);

    $this->table('shelves');
    $this->displayField('shelf_id');
    $this->primaryKey('shelf_id');

    $this->addBehavior('Timestamp');

    $this->belongsToMany('Salesmen', [
        'className' => 'Users',
        'foreignKey' => 'user_id',
        'targetForeignKey' => 'user_id',
        'joinTable' => 'shelves_salesmen',
        'through' => 'ShelvesSalesmen'
    ]);
}
}

RelationShip表

class ShelvesSalesmenTable extends Table
{

/**
 * Initialize method
 *
 * @param array $config The configuration for the Table.
 * @return void
 */
public function initialize(array $config)
{
    parent::initialize($config);

    $this->table('shelves_salesmen');
    $this->displayField('shelf_id');
    $this->primaryKey(['shelf_id', 'user_id']);
    $this->belongsTo('Shelves');
    $this->belongsTo('Users');
}
}

并且保存与编辑和添加操作中的代码相同：

$user = $this->Users->patchEntity($user, $this->request->data);
$this->Users->save($user);

错误是：

无法插入行，缺少部分主键值。得到（1，），期待（shelf_id，user_id）

谢谢大家的时间。