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What is the difference between Drupal::request()->getSession() and Drupal::service('user.private_tempstore')?



The 2019 Stack Overflow Developer Survey Results Are InWhat is the proper way of retrieving and handling sessions when making multiple calls to the API?how could the global $user be different between the Drupal interface and Services module?Authenticated REST requests becoming anonymous userWhat is the right way to force a session start?How to store information in session for anonymous user in a site without a user with uid=0?What's the difference between Drupal 8.0.x and 8.1.x?Difference between browser session and Drupal sessionEvent does not trigger each time I load a pageRestoring tempstore with another session IDDifference between service and plugin?



.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;








3















As the title suggests, I'm a bit confused about those two methods of creating and accessing a session on Drupal 8. I'm not quite sure when to use the one over the other, could someone point me to the right direction?



My issue started after a Drupal update, where originally I was using this way to start a session for anonymous users on my module:



$request = Drupal::request();
$this->session = $request->getSession();

$session = $this->session->get('mymodule');


After the update, the above code won't create a session for anonymous user and the only way to make it work was this piece of code:



$tempstore = Drupal::service('user.private_tempstore')->get('mymodule_name');
$tempstore->set('my_variable_name', ['test var' => 'this is my value']);

echo '<pre>';
print_r($tempstore->get('my_variable_name'));
echo '</pre>';


So, even though I've managed to make it work, I'm not quite sure why it did work that way.










share|improve this question

















  • 1





    If you did run composer update recently it could be connected to this (now fixed) issue drupal.org/project/drupal/issues/3045349

    – 4k4
    Apr 5 at 13:40











  • Yes, indeed.. In fact I looked at the bug report and I managed to identify the line that caused the issue. It is there, the extra condition that is being inserted: public function save() $this->storage->save(); if ($this->isStarted()) $this->storage->save();

    – Spiros
    Apr 5 at 16:01


















3















As the title suggests, I'm a bit confused about those two methods of creating and accessing a session on Drupal 8. I'm not quite sure when to use the one over the other, could someone point me to the right direction?



My issue started after a Drupal update, where originally I was using this way to start a session for anonymous users on my module:



$request = Drupal::request();
$this->session = $request->getSession();

$session = $this->session->get('mymodule');


After the update, the above code won't create a session for anonymous user and the only way to make it work was this piece of code:



$tempstore = Drupal::service('user.private_tempstore')->get('mymodule_name');
$tempstore->set('my_variable_name', ['test var' => 'this is my value']);

echo '<pre>';
print_r($tempstore->get('my_variable_name'));
echo '</pre>';


So, even though I've managed to make it work, I'm not quite sure why it did work that way.










share|improve this question

















  • 1





    If you did run composer update recently it could be connected to this (now fixed) issue drupal.org/project/drupal/issues/3045349

    – 4k4
    Apr 5 at 13:40











  • Yes, indeed.. In fact I looked at the bug report and I managed to identify the line that caused the issue. It is there, the extra condition that is being inserted: public function save() $this->storage->save(); if ($this->isStarted()) $this->storage->save();

    – Spiros
    Apr 5 at 16:01














3












3








3


1






As the title suggests, I'm a bit confused about those two methods of creating and accessing a session on Drupal 8. I'm not quite sure when to use the one over the other, could someone point me to the right direction?



My issue started after a Drupal update, where originally I was using this way to start a session for anonymous users on my module:



$request = Drupal::request();
$this->session = $request->getSession();

$session = $this->session->get('mymodule');


After the update, the above code won't create a session for anonymous user and the only way to make it work was this piece of code:



$tempstore = Drupal::service('user.private_tempstore')->get('mymodule_name');
$tempstore->set('my_variable_name', ['test var' => 'this is my value']);

echo '<pre>';
print_r($tempstore->get('my_variable_name'));
echo '</pre>';


So, even though I've managed to make it work, I'm not quite sure why it did work that way.










share|improve this question














As the title suggests, I'm a bit confused about those two methods of creating and accessing a session on Drupal 8. I'm not quite sure when to use the one over the other, could someone point me to the right direction?



My issue started after a Drupal update, where originally I was using this way to start a session for anonymous users on my module:



$request = Drupal::request();
$this->session = $request->getSession();

$session = $this->session->get('mymodule');


After the update, the above code won't create a session for anonymous user and the only way to make it work was this piece of code:



$tempstore = Drupal::service('user.private_tempstore')->get('mymodule_name');
$tempstore->set('my_variable_name', ['test var' => 'this is my value']);

echo '<pre>';
print_r($tempstore->get('my_variable_name'));
echo '</pre>';


So, even though I've managed to make it work, I'm not quite sure why it did work that way.







8 services sessions






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Apr 4 at 12:20









SpirosSpiros

285




285







  • 1





    If you did run composer update recently it could be connected to this (now fixed) issue drupal.org/project/drupal/issues/3045349

    – 4k4
    Apr 5 at 13:40











  • Yes, indeed.. In fact I looked at the bug report and I managed to identify the line that caused the issue. It is there, the extra condition that is being inserted: public function save() $this->storage->save(); if ($this->isStarted()) $this->storage->save();

    – Spiros
    Apr 5 at 16:01













  • 1





    If you did run composer update recently it could be connected to this (now fixed) issue drupal.org/project/drupal/issues/3045349

    – 4k4
    Apr 5 at 13:40











  • Yes, indeed.. In fact I looked at the bug report and I managed to identify the line that caused the issue. It is there, the extra condition that is being inserted: public function save() $this->storage->save(); if ($this->isStarted()) $this->storage->save();

    – Spiros
    Apr 5 at 16:01








1




1





If you did run composer update recently it could be connected to this (now fixed) issue drupal.org/project/drupal/issues/3045349

– 4k4
Apr 5 at 13:40





If you did run composer update recently it could be connected to this (now fixed) issue drupal.org/project/drupal/issues/3045349

– 4k4
Apr 5 at 13:40













Yes, indeed.. In fact I looked at the bug report and I managed to identify the line that caused the issue. It is there, the extra condition that is being inserted: public function save() $this->storage->save(); if ($this->isStarted()) $this->storage->save();

– Spiros
Apr 5 at 16:01






Yes, indeed.. In fact I looked at the bug report and I managed to identify the line that caused the issue. It is there, the extra condition that is being inserted: public function save() $this->storage->save(); if ($this->isStarted()) $this->storage->save();

– Spiros
Apr 5 at 16:01











1 Answer
1






active

oldest

votes


















3














The main difference is that session data is stored in the database table sessions and PrivateTempStore in key_value_expire. Session data is preloaded in memory, private tempstore data only when requested. Session data is for small amount of data not exceeding a few megabytes, private tempstore for bigger chunks of data you don't want to have in memory when not needed.



What you've posted is not starting a session, it gets a value. You would need to set a value first to start a session.






share|improve this answer























  • Yeah, my bad, it is setting the session in another controller, I just wanted to demonstrate the methods that I'm using. Also, I've found this article for a more detailed explanation: palantir.net/blog/d8ftw-storing-data-drupal-8

    – Spiros
    Apr 4 at 15:24











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1 Answer
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oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









3














The main difference is that session data is stored in the database table sessions and PrivateTempStore in key_value_expire. Session data is preloaded in memory, private tempstore data only when requested. Session data is for small amount of data not exceeding a few megabytes, private tempstore for bigger chunks of data you don't want to have in memory when not needed.



What you've posted is not starting a session, it gets a value. You would need to set a value first to start a session.






share|improve this answer























  • Yeah, my bad, it is setting the session in another controller, I just wanted to demonstrate the methods that I'm using. Also, I've found this article for a more detailed explanation: palantir.net/blog/d8ftw-storing-data-drupal-8

    – Spiros
    Apr 4 at 15:24















3














The main difference is that session data is stored in the database table sessions and PrivateTempStore in key_value_expire. Session data is preloaded in memory, private tempstore data only when requested. Session data is for small amount of data not exceeding a few megabytes, private tempstore for bigger chunks of data you don't want to have in memory when not needed.



What you've posted is not starting a session, it gets a value. You would need to set a value first to start a session.






share|improve this answer























  • Yeah, my bad, it is setting the session in another controller, I just wanted to demonstrate the methods that I'm using. Also, I've found this article for a more detailed explanation: palantir.net/blog/d8ftw-storing-data-drupal-8

    – Spiros
    Apr 4 at 15:24













3












3








3







The main difference is that session data is stored in the database table sessions and PrivateTempStore in key_value_expire. Session data is preloaded in memory, private tempstore data only when requested. Session data is for small amount of data not exceeding a few megabytes, private tempstore for bigger chunks of data you don't want to have in memory when not needed.



What you've posted is not starting a session, it gets a value. You would need to set a value first to start a session.






share|improve this answer













The main difference is that session data is stored in the database table sessions and PrivateTempStore in key_value_expire. Session data is preloaded in memory, private tempstore data only when requested. Session data is for small amount of data not exceeding a few megabytes, private tempstore for bigger chunks of data you don't want to have in memory when not needed.



What you've posted is not starting a session, it gets a value. You would need to set a value first to start a session.







share|improve this answer












share|improve this answer



share|improve this answer










answered Apr 4 at 12:58









4k44k4

53.1k561105




53.1k561105












  • Yeah, my bad, it is setting the session in another controller, I just wanted to demonstrate the methods that I'm using. Also, I've found this article for a more detailed explanation: palantir.net/blog/d8ftw-storing-data-drupal-8

    – Spiros
    Apr 4 at 15:24

















  • Yeah, my bad, it is setting the session in another controller, I just wanted to demonstrate the methods that I'm using. Also, I've found this article for a more detailed explanation: palantir.net/blog/d8ftw-storing-data-drupal-8

    – Spiros
    Apr 4 at 15:24
















Yeah, my bad, it is setting the session in another controller, I just wanted to demonstrate the methods that I'm using. Also, I've found this article for a more detailed explanation: palantir.net/blog/d8ftw-storing-data-drupal-8

– Spiros
Apr 4 at 15:24





Yeah, my bad, it is setting the session in another controller, I just wanted to demonstrate the methods that I'm using. Also, I've found this article for a more detailed explanation: palantir.net/blog/d8ftw-storing-data-drupal-8

– Spiros
Apr 4 at 15:24

















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