CakePHP 3：左连接问题的SQL异常

Question

我有4个表（ApplicationsGroupsServersTable，ApplicationsTable，ServersTable，GroupsTable）。我试图在下面的代码中使用CakePHP中的左连接，但我得到了SQL异常：

Error: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'Group ON Group.id = ApplicationsGroupsServers.group_id' at line 1

以下是我在ApplicationsGroupsServersController中的代码：

$option =array(
    'fields' => array(
      'Server.server_name',
        'Group.group_name'
    ),
    'join' => array(
       array(
                'table' => 'Servers',
                'alias' => 'Server',
                'type' => 'LEFT',
                'conditions' => array( 'Server.id = ApplicationsGroupsServers.server_id' )
            ),
        array (
            'table' => 'Groups',
            'alias' => 'Group',
            'type' => 'LEFT',
            'conditions' => array( 'Group.id = ApplicationsGroupsServers.group_id' )
        )
    )
);
$apps = $this->ApplicationsGroupsServers->find('all', $option);
$this->set('applications', $apps);

以下是我的关联：

ApplicationsGroupsServersTable：

$this->belongsTo('Applications', [
    'foreignKey' => 'application_id'
]);
$this->belongsTo('Groups', [
    'foreignKey' => 'group_id'
]);
$this->belongsTo('Servers', [
    'foreignKey' => 'server_id'
]);

ApplicationsTable：

$this->hasMany('ApplicationsGroupsServers', [
   'foreignKey' => 'application_id'
]);

GroupsTable：

$this->hasMany('ApplicationsGroupsServers', [
    'foreignKey' => 'group_id'
]);

我认为我的同事没有正确设置，但是当我用一张桌子运行左连接时，我就是获取数据的表格。以下是适用的代码：

        $option =array(
            'fields' => array(
              'Server.server_name',
                // 'Group.group_name'
            ),
            'join' => array(
               array(
                        'table' => 'Servers',
                        'alias' => 'Server',
                        'type' => 'LEFT',
                        'conditions' => array( 'Server.id = ApplicationsGroupsServers.server_id' )
                    )
//                array (
//                    'table' => 'Groups',
//                    'alias' => 'Group',
//                    'type' => 'LEFT',
//                    'conditions' => array( 'Group.id = ApplicationsGroupsServers.group_id' )
//                )
            )
        );
        $apps = $this->ApplicationsGroupsServers->find('all', $option);
        $this->set('applications', $apps);