>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3536209. --> Reported by: [mstrelan](https://www.drupal.org/user/314289) Related to !12739 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>This was moved to HistoryManager: <a href="https://git.drupalcode.org/project/history/-/blob/1.x/src/HistoryManager.php?ref_type=heads#L52">https://git.drupalcode.org/project/history/-/blob/1.x/src/HistoryManager.php?ref_type=heads#L52</a></p> <p><code>\Drupal\comment\CommentManager::getCountNewComments</code> has some magic to find functions with the pattern <code>ENTITY_TYPE_last_viewed</code>.</p> <p>The code looks like this, and has existed since we <a href="https://www.drupal.org/node/1845806">added history.module to core</a>, and we removed <code>node_last_viewed</code>.</p> <pre>$function = $entity-&gt;getEntityTypeId() . '_last_viewed';<br>if (function_exists($function)) {<br>&nbsp; $timestamp = $function($entity-&gt;id());<br>}</pre><p>There is a possibility existing contrib or custom modules are relying on this behaviour, but if these functions exist in .module files they will stop working once .module files are deprecated and removed. By deprecating now these can be updated to handle this in a supported way.</p> <h4 id="summary-steps-reproduce">Steps to reproduce</h4> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <p>Add a deprecation if the <code>function_exists</code> call returns true. Unsure what the replacement is, it would probably need to depend on <span class="drupalorg-gitlab-issue-link drupalorg-gitlab-link-wrapper"><a href="https://git.drupalcode.org/project/history/-/work_items/3267015" class="drupalorg-gitlab-link">https://git.drupalcode.org/project/history/-/work_items/3267015</a></span>. In the meantime maybe such entity types should implement an interface for this method. Or perhaps we deprecate with no replacement.</p> <h3 id="summary-remaining-tasks">Remaining tasks</h3> <ol> <li><del>Move the existing code to history.module</del></li> <li><del>Deprecate history.module in core</del></li> <li><del>Move issues for history.module over to contrib</del></li> <li>Create a hook or other path forward &lt;-- YOU ARE HERE</li> <li>Deprecate relying on the magic named functions</li> </ol> <h3 id="summary-ui-changes">User interface changes</h3> <h3 id="summary-introduced-terminology">Introduced terminology</h3> <h3 id="summary-api-changes">API changes</h3> <h3 id="summary-data-model-changes">Data model changes</h3> <h3 id="summary-release-notes">Release notes snippet</h3> > Related issue: [Issue #3520416](https://www.drupal.org/node/3520416)