cakephp 3.x数据在将数据保存到2个表时不保存

我有两个表clients和branchs,它们之间有字段client_id关系,我们clienthasMany branches和branch属于用户,我的clients/add中有以下代码。ctp视图文件

<?php 
    echo  $this->Form->create($client); 
    echo $this->Form->input('name');
    echo $this->Form->input('branch.0.branch_name');
    echo $this->Form->input('branch.0.email');
    echo $this->Form->input('profile_link');

?>

and my controller code isas follow
<?php
    public function add() {

        $client = $this->Clients->newEntity();
        if ($this->request->is('post')) {

            $client = $this->Clients->patchEntity($client, $this->request->data, [
                'associated' => ['Branches']
            ]);
            if($this->Clients->save($client)) {
                $this->Flash->success(__('data has been saved.'));
            } else {
                $this->Flash->error(__('The data could not be saved. Please, try again.'));
            }
        }
?>

但是数据保存在客户机表中而不是分支表中,请告诉我我应该做什么或者我的错误是什么 对不起我英语不好