What is the difference between Drupal::request()->getSession() and...





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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





























    2















    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

























      2












      2








      2


      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






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      asked 16 hours ago









      SpirosSpiros

      235




      235






















          1 Answer
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          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
            13 hours ago












          Your Answer








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          1 Answer
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          active

          oldest

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          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
            13 hours ago
















          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
            13 hours ago














          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 15 hours ago









          4k44k4

          53k561104




          53k561104













          • 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
            13 hours ago



















          • 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
            13 hours ago

















          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
          13 hours ago





          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
          13 hours ago


















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