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I've seen that it was possible to store custom meta data in Drupal 7 but I didn't find the equivalent for Drupal 8 ?

https://martsie.github.io/2015/03/04/drupal-how-to-use-user-data/

The data that I need to store is temporary user data that might differ from each users and it's not needed to put it as field (no sql query needed).

11

You can use the user.data service

\Drupal::service('user.data')->set('mymodule', $uid, 'some_key', 'some_value');

You can then retrieve it with the same service:

$some_key = \Drupal::service('user.data')->get('mymodule', $uid, 'some_key');
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    The relevant changelog page - drupal.org/node/1852360 – zerolab Jan 31 '17 at 12:17
  • Does this get deleted by itself? or how would you delete it? – No Sssweat Jan 31 '17 at 13:33
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    It gets deleted automatically when a user gets deleted or when a module is uninstalled. – Berdir Jan 31 '17 at 16:09
  • I didn't know that about the module un-installation. That's good information! – Jaypan Feb 1 '17 at 2:14

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