Magento – Magento 2 : Unable to save data in Sessions with Cache enabled

customer-sessionfull-page-cachemagento-2.1sessions

I am trying to save some temporary data into the customer session object ( \Magento\Customer\Model\Session ), which I need to retain until a quote is generated. I have tried two methods to save data in session, $session->setData('Att',$value); and $session->setAttValue($value); on a temporary bases. These getter and setter methods reside in a class which I created to handle session related operations and are called from observers.

The problem is : Once I store the value in the session and try to get it back, I am getting NULL value when Full Page Cache is enabled; however if the FPC is not enabled, the accessor method returns expected value from session.

PS: I found an issue which might be similar to what I am facing here, but in the issue, the solution suggested was hole-punching the block, but in my situation, I am not using any block, I am using observers only and I could not find a way to hole-punch function for observer. Any help appreciated.

Thanks in Advance,

Best Answer

Use Session factory instead.

public function __construct(
       \Magento\Customer\Model\SessionFactory $sessionFactory)
        {
           $this->sessionFactory = $sessionFactory;
        }

Now you can use customer session with FPC enabled.

$customerSession = $this->sessionFactory->create();

if ($customerSession->isLoggedIn()) {
    // customer is logged in;
}

Related Solutions

Magento – Problem with users and sessions on Magento frontend

Even if this sounds like it's too broad and does not have a version specified, I will take a shot in the dark and assume that your version 1.8.1 and you are using a theme for an older version.
A lot has changed on 1.8.1 and the themes for 1.7 (even 1.8.0) are not compatible anymore.
if you take a look here in the loginPostAction you will see this code:

if (!$this->_validateFormKey()) {
    $this->_redirect('*/*/');
    return;
}

This is new. It validates the form key for additional security. If you don't send a form key you get redirected to the login page without any errors showing.
For test purposes comment the lines I mentioned. If it works then ... bingo....that's your problem.
Uncomment the lines again and make your login form 1.8.1 compatible by adding this code inside the <form> tag in your login template.

<?php echo $this->getBlockHtml('formkey'); ?>

If my shot in the dark was a miss, and you don't use 1.8.1 tell me and I will delete the answer.

Magento 1.8 – customer/session isLoggedIn() Returns False: Fix Guide

So I found out the problem with the customer session was that I was instantiating my own custom session way to early. As I learned from this article by Alan Storm, instantiating sessions too early can break session storage, so different pages where accessing different sessions. That's why sometimes I didn't get the correct customer session data.

I was trying to use a session object in a custom router and found it's a big NO. I changed my router code to instead set a POST param to pass on my value and then store it to the session later on in the process.

P.S. My custom session is still buggy, since it appears its data is only accessible in the page request that set it and not any other subsequent requests, but the customer session is okay now so that's half the problem gone.

Best Answer

Related Solutions

Magento – Problem with users and sessions on Magento frontend

Magento 1.8 – customer/session isLoggedIn() Returns False: Fix Guide

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