Deleting Content On Module Uninstall in Drupal 8 - drupal-8

Question

I have a custom module that creates a content type on installing it. If I create a content using that content type, that content does not get deleted on uninstalling the module.
How do I delete all the contents created from that content type on uninstalling the module?
Removing the module configurations on hook_uninstall is not helping.
Thanks In Advance!

Answer 1

You must implement the hook_uninstall in your mymodule.install file.
In this hook, you will be able to remove every content using the following code:
/**
* Implements hook_uninstall().
*/
function mymodule_uninstall() {
// Load services.
$queryFactory = \Drupal::service('entity.query')
$nodeStorage = \Drupal::entityManager()->getStorage('node');
// Query all entity.
$query = $queryFactory->get('node')
->condition('type', 'article'); // <-- Change the type here for yours.
$nids = $query->execute();
// Delete entities.
if (!empty($nids)) {
$entities = $nodeStorage->loadMultiple($nids);
$nodeStorage->delete($entities);
}
}
You could also use the entity_delete_multiple but this function is now deprecated.
https://api.drupal.org/api/drupal/core%21includes%21entity.inc/function/entity_delete_multiple/8.2.x
Hope it will help you resolve your issue.

Answer 2

Since #Kevin-wenger answer uses entityManager which is deprecated.
Code using entityTypeManager as follows :
/**
* Implements hook_uninstall().
*/
function MYMODULE_uninstall() {
// Delete all nodes of given content type.
$storage_handler = \Drupal::entityTypeManager()
->getStorage('node');
$nodes = $storage_handler->loadByProperties(['type' => 'MACHINE_NAME_OF_TYPE']);
$storage_handler->delete($nodes);
// Delete content type.
$content_type = \Drupal::entityTypeManager()
->getStorage('node_type')
->load('MACHINE_NAME_OF_TYPE');
$content_type->delete();
}
Source : https://drupal.stackexchange.com/a/217938