digitalist.global // March 21 2016

Call core services of Drupal 8 via the service container

It is not very good way to call Drupal core services directly in the class. Try to avoid such code in your code. Intead of doing that you can inject core services through service containner. Following code will help you to know how you should do that.

<?php

  /**
   * Database Service Object.
   *
   * @var \Drupal\Core\Database\Connection
   */
  protected $connection;


  public function __construct(Connection $connection) {
    $this->connection = $connection;
  }

  /**
   * {@inheritdoc}
   */
  public static function create() {
    return new static($container->get('database'), $container->get('entity.manager')->getStorage('taxonomy_vocabulary')
    );


  public function validatefunction($arg) { 
    $select = $this->connection->select('taxonomy_index', 'ti')->fields('ti', array('tid'));
    $result = $select->execute();
   }
}

So intead of calling $connection = \Drupal::database(); , you should inject core services into your class visa container service.

Details code you can found :-  http://cgit.drupalcode.org/similarterms/tree/views/similarterms_handler_argument_node_nid.inc

Helpful information to read :- https://www.drupal.org/node/2133171

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