How do I fix a "Mismatched entity and/or field definitions" error on my configuration?

Question

I'm getting the following error on my Drupal 8 configuration page.

Entity/field definitions
Mismatched entity and/or field definitions
The following changes were detected in the entity type and field definitions.

Content Update the node.rng_capacity field. Update the node.rng_registrants_duplicate field. Update the node.rng_registration_groups field. Update the node.rng_registration_type field. Update the node.rng_reply_to field. Update the node.rng_status field.

I'm not sure what caused these issues or how to go about resolving them. I think they may be leftover fragments/elements from when I deleted a registration or entity type.

Answer 1

You can solve this issue by two ways.

If you installed Drush, you can run drush entity-updates. Otherwise, add the following lines in the index.php file located in the Drupal root folder, before $response->send(); and reload the page.

try {
  \Drupal::entityDefinitionUpdateManager()->applyUpdates();
}
catch (EntityStorageException $e) {
  print_r($e);
}

Then remove the code from the index.php file.

Answer 2

drush entity-updates (aka drush entup) has been deprecated as of Drupal 8.7.0. You either need to write an update script using hook_update_N(), or you can use the Devel Entity Updates module, which does the same thing as drush entup did previous to 8.7.0.

Answer 3

For Drupal 8 and Drupal 9, there is the Entity Update module, which allows to update an entity schema with Drush or without it.

The main objective of this module is to allow module developers and site administrators to update entity types schema even when entities have data.
The update can be executed via Drush (recommended), from the web browser, or programmatically.
The module also allows to view the list of entity types, the entity types update status, and show the content of an entity type.

Answer 4

Find the field in /admin/reports/fields. For each entity that uses the field, edit the field and save the parameters again.

This should be updating the database and make the entity and the field match again.

Answer 5

For Drupal 9, use devel_entity_updates module

composer require 'drupal/devel_entity_updates'
drush en devel_entity_updates
drush entity-updates

should fix the issue.