interface AlterableInterface in Drupal 8

Interface for a query that can be manipulated via an alter hook.

Hierarchy

• interface \Drupal\Core\Database\Query\AlterableInterface

13 files declare their use of AlterableInterface

block_content.module in core/modules/block_content/block_content.module

Allows the creation of custom blocks through the user interface.

database_test.module in core/modules/system/tests/modules/database_test/database_test.module

Database test module.

DefaultSelection.php in core/lib/Drupal/Core/Entity/Plugin/EntityReferenceSelection/DefaultSelection.php

entity_test.module in core/modules/system/tests/modules/entity_test/entity_test.module

Test module for the entity API providing several entity types for testing.

GroupwiseMax.php in core/modules/views/src/Plugin/views/relationship/GroupwiseMax.php

... See full list

File

core/lib/Drupal/Core/Database/Query/AlterableInterface.php, line 8

Namespace

Drupal\Core\Database\Query

interface AlterableInterface {

  /**
   * Adds a tag to a query.
   *
   * Tags are strings that identify a query. A query may have any number of
   * tags. Tags are used to mark a query so that alter hooks may decide if they
   * wish to take action. Tags should be all lower-case and contain only
   * letters, numbers, and underscore, and start with a letter. That is, they
   * should follow the same rules as PHP identifiers in general.
   *
   * @param $tag
   *   The tag to add.
   *
   * @return $this
   *   The called object.
   */
  public function addTag($tag);

  /**
   * Determines if a given query has a given tag.
   *
   * @param $tag
   *   The tag to check.
   *
   * @return
   *   TRUE if this query has been marked with this tag, FALSE otherwise.
   */
  public function hasTag($tag);

  /**
   * Determines if a given query has all specified tags.
   *
   * Each tag to check should be supplied as a separate argument.
   *
   * @todo Restore PHPDoc of variadic argument in Drupal 8.8, see
   * https://www.drupal.org/project/drupal/issues/3029729
   *
   * @return
   *   TRUE if this query has been marked with all specified tags, FALSE
   *   otherwise.
   */
  public function hasAllTags();

  /**
   * Determines if a given query has any specified tag.
   *
   * Each tag to check should be supplied as a separate argument.
   *
   * @todo Restore PHPDoc of variadic argument in Drupal 8.8, see
   * https://www.drupal.org/project/drupal/issues/3029729
   *
   * @return
   *   TRUE if this query has been marked with at least one of the specified
   *   tags, FALSE otherwise.
   */
  public function hasAnyTag();

  /**
   * Adds additional metadata to the query.
   *
   * Often, a query may need to provide additional contextual data to alter
   * hooks. Alter hooks may then use that information to decide if and how
   * to take action.
   *
   * @param $key
   *   The unique identifier for this piece of metadata. Must be a string that
   *   follows the same rules as any other PHP identifier.
   * @param $object
   *   The additional data to add to the query. May be any valid PHP variable.
   *
   * @return $this
   *   The called object.
   */
  public function addMetaData($key, $object);

  /**
   * Retrieves a given piece of metadata.
   *
   * @param $key
   *   The unique identifier for the piece of metadata to retrieve.
   *
   * @return
   *   The previously attached metadata object, or NULL if one doesn't exist.
   */
  public function getMetaData($key);

}

Members

Name	Modifiers	Type	Description	Overrides
AlterableInterface::addMetaData	public	function	Adds additional metadata to the query.	3
AlterableInterface::addTag	public	function	Adds a tag to a query.	3
AlterableInterface::getMetaData	public	function	Retrieves a given piece of metadata.	3
AlterableInterface::hasAllTags	public	function	Determines if a given query has all specified tags.	3
AlterableInterface::hasAnyTag	public	function	Determines if a given query has any specified tag.	3
AlterableInterface::hasTag	public	function	Determines if a given query has a given tag.	3