How to get Paragraph Changed Time?

Question

I know how get User entity changed time ($user->getChangedTime()).
Node has the same value ($node->changed), but I need to get this changed time from a Paragraph.

When I try this method $paragraph->getChangedTime() (the value changed do not exists) i got this:

Error: Call to undefined method Drupal\paragraphs\Entity\Paragraph::getChangedTime() ...

I have this field in my User entity, and I need to know when this field is changed. Is there any way to achieve that?

Answer 1

You can add a date/time field to the paragraph type and fill in the current time if the paragraph is changed:

mymodule.module

<?php

use Drupal\paragraphs\ParagraphInterface;
use Drupal\Core\Datetime\DrupalDateTime;
use Drupal\datetime\Plugin\Field\FieldType\DateTimeItemInterface;

/**
 * Implements hook_ENTITY_TYPE_presave() for paragraph entities.
 */
function mymodule_paragraph_presave(ParagraphInterface $paragraph) {
  if ($paragraph->getType() == 'my_paragraph_type') {
    if ($paragraph->isChanged()) {
      $paragraph->field_date->value = (new DrupalDateTime('now', DateTimeItemInterface::STORAGE_TIMEZONE))
        ->format(DateTimeItemInterface::DATETIME_STORAGE_FORMAT);
    }
  }
}