Magento2: M2.1.1 : Cannot get quote details

[kanduvisla]

When I try to get quote details, my quote does not seem to get loaded from my session.

Preconditions

1. Magento 2.1.1

2. Sessions stored in database

   Steps to reproduce

3. I add a product to the cart (as a guest)

4. Everything works, cart, checkout, etc.
5. However, my custom code says my cart is NULL. This code worked before.

Code sample (in a custom block):

public function __construct(
    \Magento\Checkout\Model\Session $checkoutSession,
)
{
    $this->checkoutSession = $checkoutSession;
}

/**
 * @return Quote
 */
public function getQuote()
{
    return $this->checkoutSession->getQuote();
}

Now if I cal $this->getQuote()->getId() it returns NULL, even though the quote is saved and all in the database.

Expected result

1. I should get the quote that belongs to the session

   Actual result

2. I get an empty quote.

[kanduvisla]

The weird part is also, that when I put the following code in the constructor of my custom block:

var_dump($this->checkoutSession->getSessionId());
var_dump($this->checkoutSession->getData());die;

I get the following result:

string(26) "ma0c3isj7v0nocd9r6lsdjk9f7"
array(0) {
}

But ... when I past the same code in the constructor of Magento\Catalog\Block\Cart, I get the correct result:

string(26) "ma0c3isj7v0nocd9r6lsdjk9f7"
array(3) {
  ["last_added_product_id"]=>
  string(1) "2"
  ["quote_id_1"]=>
  string(1) "3"
  ["cart_was_updated"]=>
  bool(false)
}

Does anyone have a clue why this could be? I just invoke the checkout session using dependency injection in my constructor. How come that one class has the correct items filled and the other hasn't?

It is the same session!

[kanduvisla]

More debugging: the method isSessionExists() returns false on my custom block, but true on the Magento Block. Diving deeper, it turns out that the session_status()-method returns '1' in my Block (PHP_SESSION_NONE), and '2' in Magento's Blocks (PHP_SESSION_ACTIVE).

Why don't I have a session in my custom block? When I manually invoke \Magento\Framework\Session\SessionManager::start(), the session_status() keeps returning '1'. :-/

[kanduvisla]

Another interesting fact: in my constructor isSessionExists() returns true. But in my getQuote()-method it returns false. Could it be that some other code is destructing my session?

[kanduvisla]

Got it!

Once again it wasn't a bug, but a feature. Turns out that if your blocks are cacheable and cache is enabled, there is a little something called \Magento\Checkout\Model\Layout\DepersonalizePlugin. What this plugin does, is it checks if your page requires 'de-personalization'. If so, it clears the checkoutSessions' storage. And ... one of the 'requirements' that well 'de-personalize' your block is if it's cacheable (you can see all requirements in \Magento\PageCache\Model\DepersonalizeChecker::checkIfDepersonalize().

So, to make a long story short and to close my couple of hours of debugging: if you need stuff from your checkout session, make sure your block isn't cached. A simple cacheable="false" in your layout should do the trick:

<block class="Vendor\Module\Block\Something" cacheable="false"
       name="something" template="Vendor_Module::something.phtml">

I hope this saves somebody a couple of hours of frustration and debugging.

[martynshanks]

Really helpful, thank you. This fixed it for me on all pages but not on the Product Description Page.

[BabliDey]

I am using magento 2.1.8. I my custom theme app\design\frontend\Sample\theme-frontend-shop\Magento_Catalog\templates\productviewform.phtml I have done

`
$quoteId = $objectManager->get('Magento\Checkout\Model\Session')->getQuoteId();
$currentItemCount=0;
if(!empty($quoteId)){
$cartItems = $objectManager->get('\Magento\Checkout\Model\Session')->getQuote()->getAllVisibleItems();
$itemsIds = array();
foreach ($cartItems as $cartItem) {
$itemsIds[] = $cartItem->getProduct()->getId();
}

$currentItemCount = count($itemsIds);

}

echo $currentItemCount;
`

and in my app\design\frontend\Sample\theme-frontend-shop\Magento_Catalog\layout\catalog_product_view.xml I have added
<referenceBlock name="product.info.addtocart" class="Magento\Checkout\Block\Cart" before="-" template="Blumeidealnew_shop::product/view/form.phtml" cacheable="false" />

But this is not working properly when full page cache is enabled.

Need help to fix this issue.

[wrossier]

Got it!

Once again it wasn't a bug, but a feature. Turns out that if your blocks are cacheable and cache is enabled, there is a little something called \Magento\Checkout\Model\Layout\DepersonalizePlugin. What this plugin does, is it checks if your page requires 'de-personalization'. If so, it clears the checkoutSessions' storage. And ... one of the 'requirements' that well 'de-personalize' your block is if it's cacheable (you can see all requirements in \Magento\PageCache\Model\DepersonalizeChecker::checkIfDepersonalize().

So, to make a long story short and to close my couple of hours of debugging: if you need stuff from your checkout session, make sure your block isn't cached. A simple cacheable="false" in your layout should do the trick:

<block class="Vendor\Module\Block\Something" cacheable="false"
       name="something" template="Vendor_Module::something.phtml">

I hope this saves somebody a couple of hours of frustration and debugging.

thanks a lot :)

[sreichel]

@kanduvisla Should be added to documentation!

[ElundKasper]

Have a problem with the mincart in 2.3 when FPC i enable and it drop the items if I visit a page that has not been cached.

Is it possible for me to exclude the minicart from the cache nad how do I do it?
Hope someone know how so my project can be finished.