Drupal 8

EntityTypeManager does not allow for filtering through moderation states, although it is in the works for Drupal 11: https://www.drupal.org/project/drupal/issues/3025164#comment-13221005. 

So if you don't want to patch core, here's how to alter your entity query for moderation states using hook_query_TAG_alter:

First add the hook funtion in your custom_module.module file:

D10 Upgrades from Drupal 9 can be tricky! There are usually unforeseen issues. Here are some commonly seen problems and solutions. 

The best place to find steps on how to upgrade: https://www.drupal.org/docs/upgrading-drupal/upgrading-from-drupal-8-or-later/upgrading-a-composer-based-site

Create a paragraph

use Drupal\node\Entity\Node;
use Drupal\paragraphs\Entity\Paragraph;         

$paragraph_1 = Paragraph::create([
    'type' => 'paragraph_type_1', //machine name of paragraph
    'field_text' => [
      'value' => 'Some text',
      'format' => 'full_html',
    ],
]);
        
$paragraph_1->save();

Create a nested paragraph

Abstract classes may have implemented methods, whereas interfaces have no implementation in themselves.

One can implement multiple interfaces, but not extend multiple classes (or abstract classes).

An abstract class implements an interface, which defines things that your objects needs to implement. An abstract class is a like a “default” class that should be able to be easily extended by static classes that are specific to objects.

Function Types:

replace

:$filesaved = file_save_data($file, $destination, FileSystemInterface::EXISTS_REPLACE);

With:

$fileRepository = \Drupal::service('file.repository');
$filesaved = $fileRepository->writeData($file, $destination, FileSystemInterface::EXISTS_REPLACE);

// Set the current date and time.
$node = Node::load(1);
$node->set('field_date', date('Y-m-d', time()));
$node->set('field_datetime', date('Y-m-d\TH:i:s', time()));
$node->set('created', time());
$node->save();

Set date values of a node.

use Drupal\node\Entity\Node; 

$node = Node::load(1);
$node->set('field_date', '2025-12-31');
$node->set('field_datetime', '2025-12-31T23:59:59');
$node->set('created', '1760140799');
$node->save();

Create a node and set its fields

Add a user to group

$uid = '5';
$gid = '40';
$user = \Drupal\user\Entity\User::load($uid);
$group = \Drupal::entityTypeManager()->getStorage('group')->load($gid);
$group->addMember($user);
$group->save();

Add content to a group

Regular query

$connection = \Drupal::database();

$user_id = '1043651';

$query_result = $connection->select('table_name', 'tn')
  ->fields('tn', ['column_name_1', 'column_name_2',])
  ->condition('uid', $user_id)
  ->execute()
  ->fetchAll(); 

A Query using Drush

drush ev "return db_query('SELECT * FROM table_name WHERE entity_id=20603’)->fetchAll()"

Load node by properties:

  $node = \Drupal::entityTypeManager()
     ->getStorage('node')
     ->loadByProperties([
      'field_something' => $some_data,
      'field_other_thing' => $other_data,
    ]);