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Drupal 8 Cheatsheet
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drupal-8-cheatsheet.md

Drupal 8 Cheatsheet

Files, Images and Media

// Load file object
$file = File::load($fid);

// Get uri (public://foo/bar/baz.png)
$uri           = $file->getFileUri(););

// Get path in FS (/var/www/drupal/sites/default/files/foo.txt)
$path          = drupal_realpath($file->getFileUri());

// Relative path in FS: /sytes/default/files/... (if public://)
$relative_path = file_url_transform_relative(file_create_url($uri));

// Load file content
$contents = file_get_contents($uri);

Create a directory in public:// if it doesn't exist.

$image_dest = 'public://article/images';                                                           
if (!is_dir($image_dest)) {                                                                      
  \Drupal::service('file_system')->mkdir($image_dest, NULL, TRUE);                               
}

Create a file using FileRepository::writeData (docs) in Drupal from image data:

use Drupal\Core\File\FileSystemInterface;

$image_url = "https://example.com/images/img.png";
$image_content = file_get_contents($image_url);                                                            
$image_filename = "img.png";

if ($image_content) {
  // D9.x
  $imageFid = \Drupal::service('file.repository')
    ->writeData(
      $image_content,
      "$image_dest/$image_filename",
      FileSystemInterface::EXISTS_REPLACE
    );
  // D8.x
  file_save_data($image_content, "$image_dest/$image_filename", FileSystemInterface::EXISTS_REPLACE);
}

Once we have a FileEntity (returned by writeData) you can create a Media like so:

$data = [
  'bundle' => 'image',
  'name' => 'Title/ALT text form image',
  'field_media_image' => ['target_id' => $imageFid],
];

$mediaEntity = \Drupal::entityManager()
  ->getStorage('media')
  ->create($data);
$mediaEntity->save();

Drupal 8 -> Drupal 9 migration:

Nodes

use Drupal\node\Entity\Node;
use Drupal\taxonomy\Entity\Term;

$node = Node::load($nid);

// or, more recomended (https://www.drupal.org/project/drupal/issues/2945539)
$node = \Drupal::entityTypeManager()->getStorage('node')->load($nid);

// Taxonmomy term
$term_item = $node->field_supplement_type->getValue();
$term = array_pop($term_item);
$tid = $term['target_id'];

// Load taxonomy term to use data
$supplement = Term::load($tid);

// or, more recomended (https://www.drupal.org/project/drupal/issues/2945539)
$supplement = \Drupal::entityTypeManager()->getStorage('taxonomy_term')->load($tid);

$item = [
  'nid'          => $nid,
  'title_prefix' => $node->field_supplement_title_prefix->value,
  'title'        => $node->title->value,
  'tid'          => $tid,
  'supplement'   => $supplement->getName(),
  'home_image'   => $this->getImagesCrop(...),
  'cover_image'  => $this->getImagesCrop(...),
  'slug'         => $supplement->field_slug->value,
  'date'         => $node->field_supplement_date->value,
];

// Body
$body_text = $node->body->value;
$body_text = $node->get('body')->value;
$body_array = $node->body->getValue();
$body_text example: '<p>Hello!</p>'
$body_array example: array(
 0 => array(
 'value' => '<p>Hello!</p>',
 'summary' => '',
 'format' => 'basic_html',
) )
$field_item_list = $

// Other alternatives

$node->get('field_slug')->getString();
$node->field_slug->getString();

// Make changes and preserve changed:
$node = Node::load($nid);
$prev_changed = $node->getChangedTime();
$node->title = "New Title";
...
$node->save()

// You need to reload and only modify changed for this to work!!
$node = Node::load($nid);
$node->setChangedTime($prev_changed);
$node->save();

Get the path of a node with:

Drupal 8.7 or earlier:

$alias = \Drupal::service('path.alias_manager')
  ->getAliasByPath("/node/$nid");

Drupal 8.8 or 9 you should use the path_alias.manager service:

$alias = \Drupal::service('path_alias.manager')
  ->getAliasByPath("/node/$nid");

For more information: https://drupal.stackexchange.com/questions/230746/get-path-alias-from-nid-or-node-object and https://www.drupal.org/node/3092086

If you have a node object you can use:

// Absolute URL
$node->toUrl()->setAbsolute()->toString()

// Relative URL
$node->toUrl()->toString();

Access entity reference fields

In this sample code $article is a content type with a $field_author field that is an entity reference to a content-type called author.

if ($article->field_author->isEmpty()) {
  // No hay autores. Salimos.
  return;
}

$article_authors = [];
foreach($article->field_author as $author) {

  $author_node = $author
    ->get('entity')
    ->getTarget()
    ->getValue();

  $article_authors[] = [
    'id' => $author_node->ID(),
    'title' => $author_node->title->value,
    'field_first_name' => $author_node->field_first_name->value,
    'field_last_name' => $author_node->field_last_name->value,
    'field_slug' => $author_node->field_slug->value
  ];
}

or better yet:

$authors = $article->get('field_author')->referencedEntities();
foreach($authos as $author) {
  $article_authors[] = [
    'id' => $author->ID(),
    // ...
  ];
}

Creating nodes

    // ...

    // Assuming the image is already uploaded to your server:
    $fid = '123'; // The fid of the image you are going to use.
    $image_media = Media::create([
      'bundle' => 'your_image_bundle_name_here',
      'uid' => '1',
      'langcode' => Language::LANGCODE_DEFAULT,
      'status' => Media::PUBLISHED,
      'your_image_field_name_here' => [
        'target_id' => $fid,
        'alt' => t('foo'),
        'title' => t('bar'),
      ],
    ]);
    $image_media->save();

    // Then do the same for the video media entity.
    // $video_media = ... ->save();

    $node = Node::create([
      // The node entity bundle.
      'type' => 'article',
      'langcode' => 'en',
      'created' => $created_date,
      'changed' => $created_date,
      // The user ID.
      'uid' => 1,
      'moderation_state' => 'published',
      'title' => $title,
      'field_article_section' => ['target_id' => $section_target_id],
      'field_author' => 111,
      'field_article_main_image' => ['target_id' => $image_media->id()],
      'field_article_main_video' => array(
        // ... the same as before
      ),
      'field_article_body_summary' => [
        'summary' => substr(strip_tags($text), 0, 100),
        'value' => $text,
        'format' => 'rich_text'
      ]
    ]);
    $node->save();
    $new_nid = $node->id();

References

Image styles

Geting the image style from a file or a uri. Taken from this gist

use Drupal\file\Entity\File;
use Drupal\image\Entity\ImageStyle;

// File ID.
$fid = 123;

// Load file.
$file = File::load($fid);

// Get origin image URI.
$image_uri = $file->getFileUri();

// Load image style "thumbnail".
$style = ImageStyle::load('thumbnail');

// Get URI.
$uri = $style->buildUri($image_uri);

// Get URL.
$url = $style->buildUrl($image_uri);

Taxonomy

// Load taxonomy tree into $tree
$tree = \Drupal::entityTypeManager()
  ->getStorage('taxonomy_term')
  ->loadTree(self::HOME_SUPPLEMENT_LIST_VID);

Entity Queries

 // Sample query on Nodes
 $query = \Drupal::entityQuery('node');
 $query->condition('status', 1);
 $query->condition('type', 'supplement');
 $query->condition('field_supplement_type.entity.tid', $slug->tid);
 // or by name:
 $query->condition('field_tags.entity.name', 'tag1');
 // or by parent tid
 $query->condition('field_supplement_type.entity.parent', $slug->tid);
 // Disable access control if we are anonynous for example
 $query->accessCheck(FALSE);
 
 $now = new DrupalDateTime('now');
 $now->setTimezone(new \DateTimeZone(DATETIME_STORAGE_TIMEZONE)); // set a desired timezone (instead of the one from the site)
 $query->condition('field_date', $now->format(DATETIME_DATETIME_STORAGE_FORMAT), '>=');

 $query->sort('field_supplement_date', 'DESC');
 $query->range(0, 1);
 $entity_ids = $query->execute();

 foreach($entity_ids as $nid) {
   // Load all information for this node
   $node = Node::load($nid);
   // Do something with node and return some data
   $supplements[] = $doSomething($node);
 }
 
 // Sample query on taxonomy. Filtering by a custom column on a taxonomy
 $query = \Drupal::entityQuery('taxonomy_term');
 $query->condition('vid', 'vocubulary_name');
 $query->condition('field_custom_text', $text);
 $tids = $query->execute();
 $terms = \Drupal\taxonomy\Entity\Term::loadMultiple($tids);

Services

Using services:

$service = \Drupal::service('module.service_name');

$result = $service->methodInMyService(157);

Creating a service (Example taken from https://www.drupal.org/project/drupal/issues/2945539#comment-13291384):

Add a mymodule.services.yml to your module directory:

services:
  mymodule.myservice:
    class: Drupal\mymodule\Services\MyService
    arguments: ['@entity_type.manager']

Add the service in src/Services/MyService.php with:

namespace Drupal\mymodule\Services;

use Drupal\Core\Entity\EntityTypeManagerInterface;
use Drupal\node\NodeStorageInterface;

/**
 * Class MyService.
 */
class MyService {

  /**
   * @var EntityTypeManagerInterface
   */
  protected $entityTypeManager;

  /**
   * @var NodeStorageInterface
   */
  protected $nodeStorage;

  /**
   * @param EntityTypeManagerInterface $entity_type_manager
   */
  public function __construct(EntityTypeManagerInterface $entity_type_manager) {
    $this->entityTypeManager = $entity_type_manager;
    $this->nodeStorage =  $this->entityTypeManager->getStorage('node');
  }

  /**
   * Load a node.
   *
   * @param int $nid
   *   The ID of the node to load.
   */
  public function loadANode($nid) {
    return $this->nodeStorage->load($nid);
  }
}

Dependencies

It is good practice to pass along references to popular services instead of using \Drupal::service(). For example: if you need an entityTypeManager it is preferred to inject it instead of using \Drupal::entityTypeManager(). It makes your code more easily testable. Some common services to inject into your Service might be:

  • entity_type.manager - EntityTypeManager object to perform entity queries on
  • database - Connection object to the Drupal database to perform queries on
  • current_user - AccountProxy to the current user
  • date.formatter - DateFormatter object which gives you access to the DateFormat::format() using Drupal date formats

For a full listing of Drupal's core services check this link

Config

To use your config:

$config = \Drupal::service('config.factory')->get('mymodule.settings');
$value = $config->get('key');
...

or simpler

$config = \Drupal::config('mymodule.settings')->get('name_of_form_field');

Custom entities

baseFieldDefinitions

Let's take a look at a method baseFieldDefinitions and its abilities today.

Base fields are non-configurable fields that always exist on a given entity type, like the node title or created and changed dates. By definition, base fields are fields that exist for every bundle.

Entity types define their base fields in a static method baseFieldDefinitions on the entity class. The definitions returned by this function can be overridden for all bundles by hook_entity_base_field_info_alter() or overridden on a per-bundle basis via base_field_override configuration entities. Drupal core has the following field types:

  • boolean
  • changed
  • created
  • decimal
  • email
  • entity_reference
  • float
  • integer
  • language
  • map
  • password
  • string
  • string_long
  • timestamp
  • uri
  • uuid
  • comment
  • datetime
  • file
  • image
  • link
  • list_float
  • list_integer
  • list_string
  • path
  • telephone
  • text
  • text_long
  • text_with_summary

Below you can find examples with most of these types of fields.

entity_reference field

$fields['user_id'] is an example of entity_reference field.

The default widget – entity_reference_autocomplete, the default formatter – entity_reference_label. In settings, you can set the entity type for auto-complete. Also, you can set a handler (the examples of creating custom handlers you can find here).

With setDisplayOptions config, we can set options for the field widget (display context – form) and the field formatter (display context – view).

For better understanding, see another example with a node entity:

      $fields['article'] = BaseFieldDefinition::create('entity_reference')
          ->setLabel(t('Article'))
          ->setDescription(t('Article related to demo entity.'))
          ->setSetting('target_type', 'node')
          ->setSetting('handler', 'default:node')
          ->setSetting('handler_settings', [
            'target_bundles' => ['article' => 'article'],
            'auto_create' => FALSE,
          ])
          ->setRequired(TRUE)
          ->setTranslatable(FALSE)
          ->setDisplayOptions('view', [
            'label' => 'visible',
            'type' => 'string',
            'weight' => 2,
          ])
          ->setDisplayOptions('form', [
            'type' => 'entity_reference_autocomplete',
            'weight' => 2,
            'settings' => [
              'match_operator' => 'CONTAINS',
              'size' => '60',
              'placeholder' => 'Enter here article title...',
            ],
          ])
          ->setDisplayConfigurable('view', TRUE)
          ->setDisplayConfigurable('form', TRUE);

Note that we can set target_bundles in handler_settings.

String field

$fields['name'] – is an example of a string field.

This field contains a plain string value. The default widget is string_textfield, and the default formatter – string.

string_long field

Also, we can create a string_long field that can contain a long string value. The default widget is string_textarea, the default formatter – basic_string.

      $fields['notes'] = BaseFieldDefinition::create('string_long')
          ->setLabel(t('Notes'))
          ->setDescription(t('Example of string_long field.'))
          ->setDefaultValue('')
          ->setRequired(FALSE)
          ->setDisplayOptions('view', [
            'label' => 'visible',
            'type' => 'basic_string',
            'weight' => 5,
          ])
          ->setDisplayOptions('form', [
            'type' => 'string_textarea',
            'weight' => 5,
            'settings' => ['rows' => 4],
          ])
          ->setDisplayConfigurable('view', TRUE)
          ->setDisplayConfigurable('form', TRUE);

boolean field

If an entity field contains a boolean value, the default widget is boolean_checkbox, the default formatter – boolean.

       $fields['status'] = BaseFieldDefinition::create('boolean')
          ->setLabel(t('Publishing status'))
          ->setDescription(t('A boolean indicating whether the Demo entity is published.'))
          ->setDefaultValue(TRUE)
          ->setSettings(['on_label' => 'Published', 'off_label' => 'Unpublished'])
          ->setDisplayOptions('view', [
            'label' => 'visible',
            'type' => 'boolean',
            'weight' => 2,
          ])
          ->setDisplayOptions('form', [
            'type' => 'boolean_checkbox',
            'weight' => 2,
          ])
          ->setDisplayConfigurable('view', TRUE)
          ->setDisplayConfigurable('form', TRUE);

list_integer, list_float, list_string fields

These fields come from the options module and basically similar, so it is enough to demonstrate the use of one of them.

All these fields have options_select as the default widget and list_default as the default formatter. 

     $fields['http_status'] = BaseFieldDefinition::create('list_integer')
          ->setLabel(t('HTTP status code'))
          ->setDescription(t('Hypertext Transfer Protocol (HTTP) response status codes.'))
          ->setDefaultValue(200)
          ->setSettings([
            'allowed_values' => [
              200 => 'OK',
              201 => 'Created',
              202 => 'Accepted',
              300 => 'Multiple Choices',
              301 => 'Moved Permanently',
              302 => 'Moved Temporarily',
              403 => 'Forbidden',
              404 => 'Not Found',
            ],
          ])
          ->setDisplayOptions('view', [
            'label' => 'visible',
            'type' => 'list_default',
            'weight' => 6,
          ])
          ->setDisplayOptions('form', [
            'type' => 'options_select',
            'weight' => 6,
          ])
          ->setDisplayConfigurable('view', TRUE)
          ->setDisplayConfigurable('form', TRUE);

text, text_long, text_with_summary fields

These fields store a text with a text format.

As the default formatted, all of them uses text_default, for the widget – text_textfield, text_textarea and text_textarea_with_summary.

       $fields['text_long'] = BaseFieldDefinition::create('text_long')
          ->setLabel(t('Text (formatted, long)'))
          ->setDescription(t('Test formatted text.'))
          ->setDisplayOptions('view', [
            'label' => 'visible',
            'type' => 'text_default',
            'weight' => 6,
          ])
          ->setDisplayOptions('form', [
            'type' => 'text_textarea',
            'weight' => 6,
            'rows' => 6,
          ])
          ->setDisplayConfigurable('view', TRUE)
          ->setDisplayConfigurable('form', TRUE);

datetime field

       $fields['start_date'] = BaseFieldDefinition::create('datetime')
          ->setLabel(t('Only Date'))
          ->setDescription(t('Date field example.'))
          ->setRevisionable(TRUE)
          ->setSettings([
            'datetime_type' => 'date',
          ])
          ->setDefaultValue('')
          ->setDisplayOptions('view', [
            'label' => 'above',
            'type' => 'datetime_default',
            'settings' => [
              'format_type' => 'medium',
            ],
            'weight' => -9,
          ])
          ->setDisplayOptions('form', [
            'type' => 'datetime_default',
            'weight' => -9,
          ])
          ->setDisplayConfigurable('form', TRUE)
          ->setDisplayConfigurable('view', TRUE);

Widgets

-------------------------------------------- --------------------------------------------------------------------------------------- 
  Plugin ID                                    Plugin class                                                                           
 -------------------------------------------- --------------------------------------------------------------------------------------- 
  boolean_checkbox                             Drupal\Core\Field\Plugin\Field\FieldWidget\BooleanCheckboxWidget                       
  datetime_datelist                            Drupal\datetime\Plugin\Field\FieldWidget\DateTimeDatelistWidget                        
  datetime_default                             Drupal\datetime\Plugin\Field\FieldWidget\DateTimeDefaultWidget                         
  datetime_timestamp                           Drupal\Core\Datetime\Plugin\Field\FieldWidget\TimestampDatetimeWidget                  
  email_default                                Drupal\Core\Field\Plugin\Field\FieldWidget\EmailDefaultWidget                          
  entity_reference_autocomplete                Drupal\Core\Field\Plugin\Field\FieldWidget\EntityReferenceAutocompleteWidget           
  entity_reference_autocomplete_tags           Drupal\Core\Field\Plugin\Field\FieldWidget\EntityReferenceAutocompleteTagsWidget       
  field_example_3text                          Drupal\field_example\Plugin\Field\FieldWidget\Text3Widget                              
  field_example_colorpicker                    Drupal\field_example\Plugin\Field\FieldWidget\ColorPickerWidget                        
  field_example_text                           Drupal\field_example\Plugin\Field\FieldWidget\TextWidget                               
  field_permission_example_widget              Drupal\field_permission_example\Plugin\Field\FieldWidget\TextWidget                    
  file_generic                                 Drupal\file\Plugin\Field\FieldWidget\FileWidget                                        
  image_image                                  Drupal\image\Plugin\Field\FieldWidget\ImageWidget                                      
  language_select                              Drupal\Core\Field\Plugin\Field\FieldWidget\LanguageSelectWidget                        
  link_default                                 Drupal\link\Plugin\Field\FieldWidget\LinkWidget                                        
  menu_item_extras_view_mode_selector_select   Drupal\menu_item_extras\Plugin\Field\FieldWidget\MenuItemExtrasViewModeSelectorSelect  
  moderation_state_default                     Drupal\content_moderation\Plugin\Field\FieldWidget\ModerationStateWidget               
  number                                       Drupal\Core\Field\Plugin\Field\FieldWidget\NumberWidget                                
  oembed_textfield                             Drupal\media\Plugin\Field\FieldWidget\OEmbedWidget                                     
  options_buttons                              Drupal\Core\Field\Plugin\Field\FieldWidget\OptionsButtonsWidget                        
  options_select                               Drupal\Core\Field\Plugin\Field\FieldWidget\OptionsSelectWidget                         
  path                                         Drupal\path\Plugin\Field\FieldWidget\PathWidget                                        
  string_textarea                              Drupal\Core\Field\Plugin\Field\FieldWidget\StringTextareaWidget                        
  string_textfield                             Drupal\Core\Field\Plugin\Field\FieldWidget\StringTextfieldWidget                       
  text_textarea                                Drupal\text\Plugin\Field\FieldWidget\TextareaWidget                                    
  text_textarea_with_summary                   Drupal\text\Plugin\Field\FieldWidget\TextareaWithSummaryWidget                         
  text_textfield                               Drupal\text\Plugin\Field\FieldWidget\TextfieldWidget                                   
  uri                                          Drupal\Core\Field\Plugin\Field\FieldWidget\UriWidget                                   
 -------------------------------------------- ---------------------------------------------------------------------------------------

References:

Logging

Para logear en reemplazo de watchdog() se usa el siguiente código:

\Drupal::logger('my_module')->error($message);

Otras opciones son:

\Drupal::logger('my_module')->emergency( $message, $vars )
\Drupal::logger('my_module')->alert(     $message, $vars );
\Drupal::logger('my_module')->critical(  $message, $vars );
\Drupal::logger('my_module')->error(     $message, $vars );
\Drupal::logger('my_module')->warning(   $message, $vars );
\Drupal::logger('my_module')->notice(    $message, $vars );
\Drupal::logger('my_module')->info(      $message, $vars );
\Drupal::logger('my_module')->debug(     $message, $vars );

Normalizer and Serializer

Links:

Creating your own Normalizer

Create a class in my_module/src/Normalizer/MyEntityNormalizer.php with the normalizer code:

namespace Drupal\my_module\Normalizer;

use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
use Symfony\Component\Serializer\Normalizer\SerializerAwareNormalizer;

class MyEntityNormalizer extends SerializerAwareNormalizer implements NormalizerInterface {

  public function normalize($entity, $format = NULL, array $context = []) {
    $normalizer['id'] = $entity->id();
    $normalizer['field_title'] = $entity->field_title->value;
    
    // Calling normalizer on referenced entities:
    $normalized['field_xxxxxx'] = array_map(function($district) use ($format, $context) {
      return $this->serializer->normalize($district, $format, $context);
    }, $entity->field_xxxxxx->referencedEntities());
    
    return $normalizer;
  }
  
  public function supportsNormalization($data, $format = NULL) {
    if (!is_object($data) || $format !== 'json') {
      return FALSE;
    }
    
    if ($data instanceof Entity) {
      return TRUE;
    }
    
    return FALSE;
  }
}

You must also add your Normalizer to my_module.services.yml:

services:
  my_module.entity_name.normalizer:
    class: Drupal\my_module\Normalizer\MyEntityNormalizer
    tags:
      - { name: normalizer, priority: 10 }

Using serializer

use Drupal\node\Entity\Node;

// Serialize a node to JSON
$node = Node::load($nid);
$format = 'json';
$serialized_content = \Drupal::service('serializer')
  ->serialize($node, $format)
);

// Deserialize from JSON -> Node
$node = \Drupal::service('serializer')
  ->deserialize($serialized_content, \Drupal\node\Entity\Node::class, 'json');

You can serialize more complex structures like so:

<?php

use Drupal\node\Entity\Node;

$list = [
   Node::load(44130),
   Node::load(44131),
   Node::load(44130),
];

$object = [
   'total' => 3,
   'data' => $list
];

print_r(
   \Drupal::service('serializer')->serialize($object, 'json')
);

will output:

{
    "data": [
        {
            "nid": "44130",
            "title": "Primer update de la nota"
        },
        {
            "nid": "44131",
            "title": "Un nuevo update a mi nodo"
        },
        {
            "nid": "44132",
            "title": "Tercer update de la nota"
        }
    ],
    "total": 3
}

Migrate

Para ejecutar una migración via código:

    // Correr migración
   $manager = \Drupal::service('plugin.manager.migration');
   $plugins = $manager->createInstances([]);
   $migration = FALSE;
   foreach($plugins as $id => $plugin) {
     if ($id == '[[[migration-id]]]') {
       $migration = $plugin;
     }   
   }   

   // Implementation of MigrateMessageInterface to track migration messages.
   $log = new ReclamoLogMigrateMessage();

   // if $replace run with equivalente of --update drush flag
   if ($replace) {
     $migration->getIdMap()->prepareUpdate();
   }   
   
   // Create MigrateExecutable instance
   $executable = new MigrateExecutable($migration, $log);

   // Run migration
   $executable->import();

Storing temporary data

// For "mymodule_name," any unique namespace will do.
// I'd probably use "mymodule_name" most of the time.
$tempstore = \Drupal::service('user.private_tempstore')->get('mymodule_name');
$tempstore->set('my_variable_name', $some_data);

// Retrieve data
$tempstore = \Drupal::service('user.private_tempstore')->get('mymodule_name');
$some_data = $tempstore->get('my_variable_name');

// Clear data
$tempstore->set('my_variable_name', false);

more info here: https://atendesigngroup.com/blog/storing-session-data-drupal-8

Rendering

To render a body field you can use check_markup() like so:

$html = check_markup($text, $format_id, $lang);

$format_id can be basic_html, full_html, etc. The previous code is equivalente to:

  $filter_types_to_skip = [...];
  $build = [
    '#type' => 'processed_text',
    '#text' => $text,
    '#format' => $format_id,
    '#filter_types_to_skip' => $filter_types_to_skip,
    '#langcode' => $langcode,
  ];
  return \Drupal::service('renderer')
    ->renderPlain($build);

Caching

If it is about clearing the cache after the user changes settings, you can clear the node_view cache tag with Drupal::entityManager()->getViewBuilder('node')->resetCache(). If you want to clear the cache of a specific tag, you can pass the node ID to that method or you can use \Drupal\Core\Cache\Cache::invalidateTags($node->getCacheTags()).

Each thing that is rendered has one or multiple cache tags (inspect the X-Drupal-Cache-Tags header of a page response, I'm sure there will be development tools to better understand them in the future), by invalidating them, you can automatically clear all caches that contain them. You can enable debuggin by setting http.response.debug_cacheability_headers: true in your services.yml

Resources

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