levmyshkin

<?php
// modules/custom/drupalbook/src/Form/MultiStepForm.php
namespace Drupal\drupalbook\Form;

use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormStateInterface;

class MultiStepForm extends FormBase
{

levmyshkin

<?php

// Load node by nid:
$nid = 234; 
$node_storage = \Drupal::entityTypeManager()->getStorage('node');
$node = $node_storage->load($nid);

// Get node id:
$nid = $node->id();

levmyshkin

<?php

//Getting a file by ID:
$fid = 42; 
$file_storage = \Drupal::entityTypeManager()->getStorage('file');
$file = $file_storage->load($fid);

// Getting the file object from the node field:
$file = $node->field_image->entity;

levmyshkin

<?php

// You can get multiple values from reference fields and process them through foreach:
foreach ($node->field_my_entity_reference as $reference) {  
  print $reference->target_id;  
  print $reference->entity->title->value;  
}

// Modifying an entity reference multiple field:
$nids = [3,4,5,6];  

levmyshkin

<?php

$my_paragraph = null;
  
foreach ($node->get('field_paragraph_reference') as $paragraph) {
  if ($paragraph->entity->getType() == 'your_paragraph_type') {  
    $my_paragraph = $paragraph->entity;
  }
}
  

levmyshkin

<?php

// Create node programmatically.
use \Drupal\node\Entity\Node;
 
$node = Node::create([
  'type'        => 'article',
  'title'       => 'Druplicon test',
]);
$node->save();

levmyshkin

<?php
// modules/custom/drupalbook_examples/src/EventSubscriber/DrupalbookExamplesSubscriber.php
namespace Drupal\drupalbook_examples\EventSubscriber;
 
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
class DrupalbookExamplesSubscriber implements EventSubscriberInterface {

levmyshkin

<?php

// Select
// Get single value:
$query = \Drupal::database()->select('node_field_data', 'n');
$query->addField('n', 'nid');
$query->condition('n.title', 'About Us');
$query->range(0, 1);
$nid = $query->execute()->fetchField();

levmyshkin

<?php
// from https://www.drupal.org/project/did_this_help
// https://drupalbook.org/drupal/914-writing-integration-views
/**
 * @file
 * Provide views data for did_this_help.module.
 */

/**
 * Implements hook_views_data().

levmyshkin

<?php

namespace Drupal\did_this_help\Plugin\views\filter;

use Drupal\views\Plugin\views\filter\InOperator;

/**
 * Filters by given list of yes/no options.
 *
 * @ingroup views_filter_handlers