Parent render cache not clearing on child node update

rhy

7/16/24, 10:07 AM

I have content types Parent and Child. Parent is a referenced entity in Child. My Parent template lists all children with reference to this parent.

After updating the parents referenced in a Child node, the Parent template does not show the change, unless I manually clear all caches. Disabling render cache globally solves the problem. It seems that Parent cache does not invalidate on updating the Child node. Is this behavior by design? How can I fix it?

Drupal ver. 10.1.0

I use the preprocess_node hook to pass children to the parent template:

function mytheme_preprocess_node(&$variables)
{
  // Check if the current node is of type 'parent'
  if ($variables['node']->getType() == 'parent') {
    // Load all 'children' nodes referencing the current 'parent' node
    $query = \Drupal::entityQuery('node')
      ->accessCheck(FALSE)
      ->condition('type', 'child')
      ->condition('field_child_parent', $variables['node']->id());
    $children_ids = $query->execute();

    // Load the 'children' nodes
    $children = \Drupal::entityTypeManager()->getStorage('node')->loadMultiple($children_ids);

    // Pass the 'children' nodes to the template.
    $variables['children'] = $children;
  }
}

Following comment by @4uk4 I added:

$variables['#cache']['tags'][] = 'node_list';

This is working, but is it the best solution in terms of performance?

0 + 4

caching

cilefen

7/16/24, 11:01 AM

What is the Drupal version? Assuming 9 or 10, this is because there is missing cache metadata. Are there any custom modules? What template hooks are implemented in your custom theme?

4uk4

7/16/24, 11:31 AM

See https://drupal.stackexchange.com/questions/246514/get-referenced-node-fields-in-twig-where-reference-is-on-remote-node-only

cilefen

7/16/24, 11:52 AM

You should reference the specific nodes like `node:42` for the best performance.

4uk4

7/16/24, 12:03 PM

`node:42` is not enough because the reference to a parent node can be added without modifying the parent. You need the list tag, but now you can use a content type specific list tag which improves cache performance: `node_list:content_type_child`

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