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I have a Drupal 7 site with a bunch of users. I want to migrate the users to Drupal 8 but not any of the content so I'm writing a crosswalk. Drupal 8 has uuid in the users table. Is there a way I can compute this or can I just set it to NULL? Thanks!

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No, cannot be empty.

You can generate one with

$uuid_service = \Drupal::service('uuid');
$uuid = $uuid_service->generate();

If you use User::create it will automatically generate one for you.

Drupal\user\Entity\User::create([
  'uid' => $uid,
  'name' => '$user_name,
  'mail' => $email,
  'roles' => [],
  'pass' => [
    'value' => $hashed_drupal_7_password,
    'pre_hashed' => TRUE,
  ],
  'status' => 1,
])->save();

Rather than code it from scratch. The proper, Drupal way, to migrate is using all of these:

I suggest your read this article A Quick Guide to Migrating Drupal Content from D7 to D8 which goes over how to migrate users and other scenarios.

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  • Even easier, I discovered the Universally Unique IDentifier module for Drupal 7. That generated uuids that I can just port over.
    – Chanel
    Oct 23 '20 at 14:34

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