public function create()
    {
        $this->autoRender = false;
        $thread = $this->Threads->newEntity($this->request->data['users'], ['associated' => ['Users']]);
        $this->Threads->save($thread);

        $users = $this->Threads->Users->find()->where(['Users.id IN' => $this->request->data['users']]);
        $this->Threads->Users->link($thread, $users->toArray());

        echo json_encode($thread->id, JSON_NUMERIC_CHECK);
    }