Basic code examples for Drupal 9

D9 example code

<?php
// Load a Node
use Drupal\node\Entity\Node;

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

// Load Multiple Nodes
use Drupal\node\Entity\Node;

$nodes = Node::loadMultiple($nids);

// Get the node from a request, previously menu_get_object
$node = Drupal::request()->attributes->get('node');

// Get the title of a node
use Drupal\node\Entity\Node;

$title = Node::load($nid)->get('title')->value;

// Get the Node Type
$node = Node::load($nid);
$node->getType();

// Get the value of a field from the node
$node->get('field_my_text’)->value; // textfield
$node->get('field_blog_url')->uri; // link
$node->get(‘body’)->summary; //body summary

/*
Depending on the structure of the field you will get the values in the right property, you can take a look to the field table definition to know what can you use after the get.

That is to get the first value of the field, if you have a multivalued field the things changes a little bit.
*/

// The method getValue() is used to get an array:
$array = $user->get('field_value')->getValue();

// If you want to get a skalar use:
$value = $user->get('field_value')->value;

/*
Both methods look similar, but do different things:

The method getValue() is to get the complete array of a field, which is quite useful for multiple value fields or multiple properties.

The method ->value gets the property with the same name. Most standard fields use value as the main property, other examples are target_id for entity references, lat / long for geofields, etc.
*/

// Render a node view, previously node_view

// For a single node
$node = Node::load($nid); 
 $view_builder = \Drupal::entityTypeManager()->getViewBuilder($node->getEntityTypeId());
 $node_view = $view_builder->viewMultiple($nodes, 'teaser');
 
// For multiple nodes at once
$nodes = Node::loadMultiple($nids); 
 $view_builder = \Drupal::entityTypeManager()->getViewBuilder(reset($nodes)->getEntityTypeId());
 $nodes_views = $view_builder->viewMultiple($nodes, 'teaser');

// In both cases you can call directly to render to get the html output or in twig just use
{{ node_view }}

You can still do node_view and render but that is calling to deprecated flagged methods, will change some day.

// Load a taxonomy term by the name
$terms = taxonomy_term_load_multiple_by_name(‘My Term’);

// Note: will return an array of matched terms.

// Get the term id
$tid = $term->get('tid')->value;

// Entity Query
$nids = \Drupal::entityQuery('node')
 ->condition('status', 1)
 ->condition('type', 'blog_post')
 ->condition('field_blog_category', $tid)
 ->sort('nid', 'DESC')
 ->range(0, 10)
 ->execute();
 
// Get the alias of a path
$url_alias = \Drupal::service('path_alias.manager')->getAliasByPath('/taxonomy/term/111’);


// TWIG:

// Render the node title
{{ node.title.value }}

// Build the url of the node
{% set node_url = path('entity.node.canonical', {'node': node.id}) %}

// Or for other kinds of entities
// Link to the default frontpage content listing view:
<a href="{{ path('view.frontpage') }}">{{ 'View all content'|t }}</a>

// Link to a specific user profile page:
<a href="{{ path('entity.user.canonical', {'user': user.id}) }}">{{ 'View user profile'|t }}</a>

// Link to a view, and throw in some additional query string parameters:
<a href="{{ path('view.articles.page_1', {'page': 2}) }}">{{ 'Go to page 2'|t }}</a>

// Link to a view and pass in some arguments to the view:
<a href="{{ path('view.recent_articles_by_author.page_1', {'arg_0': user.field_display_name.value|drupal_escape }) }}">{{ 'See all the articles written by'|t }} {{ user.field_display_name.value }}</a>

// Get the current Path Url
$current_url = Url::fromRoute('<current>');
$path = $current_url->toString();

// Print the creation date formatted
{{ node.createdtime|format_date('long') }}

// Get the current user Object
use Drupal\user\Entity\User;

$userCurrent = \Drupal::currentUser();
$user = \Drupal\user\Entity\User::load($userCurrent->id());
$name = $user->getUsername();
?>