$.ajax({
                type: "POST",url: 'locations/add',data: {
                  abbreviation: $(jqInputs[0]).val(),description: $(jqInputs[1]).val()
                },success: function (response) {
                    if(response.status === "success") {
                        // do something with response.message or whatever other data on success
                        console.log('success');
                    } else if(response.status === "error") {
                        // do something with response.message or whatever other data on error
                        console.log('error');
                    }
                }
            });

当我尝试这个时,我收到以下错误消息：

Controller actions can only return Cake\Network\Response or null.

在AppController中我有这个

$this->loadComponent('RequestHandler');

启用.

Controller函数如下所示：

public function add()
{
    $this->autoRender = false; // avoid to render view

    $location = $this->Locations->newEntity();
    if ($this->request->is('post')) {
        $location = $this->Locations->patchEntity($location,$this->request->data);
        if ($this->Locations->save($location)) {
            //$this->Flash->success(__('The location has been saved.'));
            //return $this->redirect(['action' => 'index']);
            return json_encode(array('result' => 'success'));
        } else {
            //$this->Flash->error(__('The location could not be saved. Please,try again.'));
            return json_encode(array('result' => 'error'));
        }
    }
    $this->set(compact('location'));
    $this->set('_serialize',['location']);
}

我在这里想念什么？是否需要其他设置？