cakephp 3 session variable empty in other functions - php

Question

Im trying to access session throw different controllers OR in different functions in one controller but when i try access the value from different function , variable is NULL
i read some documents (including cakephp session cookbook) and more , but i couldnt understand a bit on how to configure the session before using it.
i have a problem in one controller that im trying to use a session but the value is null after im writing it in another function!?
my other question is how can i avoid writing $this->request->session(); in every function that i want to use session.
CODE :
<?php
namespace App\Controller;
use App\Controller\AppController;
use App\Model\Entity\Answer;
use Cake\ORM\TableRegistry;
class ComlibsController extends AppController {
public function index() {
}
public function getResult(){
$this->viewBuilder()->layout('comlib'); //change the layout from default
$live_req = $this->request->data['searchBox']; // get the question
$session->write('comlib/question' , $live_req);
$query = $this->Comlibs->LFA($live_req); // get the first answer
$shown_answerID = array($query[0]['answers'][0]['id'], '2');
$this->Session->write(['avoidedID' => $shown_answerID]); //avoid the answer that user saw to repeat agian
$this->set('question',$query[0]['question']); // does work
//get the answers result
//and send the array to the
$fields = array('id','answer','rate' , 'view' , 'helpful');
for ($i = 0 ; $i <= 6 ; $i++) {
$this->set('id'.$i,$query[0]['answers'][$i][$fields[0]]);
$this->set('answer'.$i,$query[0]['answers'][$i][$fields[1]]);
$this->set('rate'.$i,$query[0]['answers'][$i][$fields[2]]);
$this->set('view'.$i,$query[0]['answers'][$i][$fields[3]]);
$this->set('helpful'.$i,$query[0]['answers'][$i][$fields[4]]);
}
}
public function moveon() {
$this->render('getResult');
$this->viewBuilder()->layout('comlib');
echo $question = $session->read('comlib/question'); // empty value echo
$avoidedIDs = $session->read('avoidedID');
var_dump($avoidedIDs); // returns NULL WHY ?
$theid = $this->request->here;
$query = $this->Comlibs->LFM($theid,$avoidedIDs,$question);
echo 'imcoming';
}
}
Thanks In Adnvanced

Answer 1

You use these codes for write and read session data:
$this->request->session()->write($name, $value);
$this->request->session()->read($name);
Please read this section in CakePHP book.

Answer 2

Try
$this->session()->write('avoidedID', $shown_answerID);
instead of
$this->session()->write(['avoidedID' => $shown_answerID]);
And try
$avoidedIDs = $this->session()->read('avoidedID');
instead of
$avoidedIDs = $session->read('avoidedID');