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

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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.

8 services sessions

share|improve this question

asked yesterday

SpirosSpiros

235

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  If you did run composer update recently it could be connected to this (now fixed) issue drupal.org/project/drupal/issues/3045349
  
  – 4k4
  14 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  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
  12 hours ago
  
  

  
  
  
  

add a comment | 

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.

8 services sessions

share|improve this question

asked yesterday

SpirosSpiros

235

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  If you did run composer update recently it could be connected to this (now fixed) issue drupal.org/project/drupal/issues/3045349
  
  – 4k4
  14 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  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
  12 hours ago
  
  

  
  
  
  

add a comment | 

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

asked yesterday

SpirosSpiros

235

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

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

$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>';

share|improve this question

asked yesterday

SpirosSpiros

235

share|improve this question

asked yesterday

SpirosSpiros

235

asked yesterday

SpirosSpiros

235

asked yesterday

SpirosSpiros

235

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

answered yesterday

4k44k4

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
  yesterday
  

  
  
  
  

add a comment | 

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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

answered yesterday

4k44k4

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
  yesterday
  

  
  
  
  

add a comment | 

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

answered yesterday

4k44k4

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
  yesterday
  

  
  
  
  

add a comment | 

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

answered yesterday

4k44k4

53k561104

share|improve this answer

answered yesterday

4k44k4

53k561104

answered yesterday

4k44k4

53k561104

answered yesterday

4k44k4

53k561104