>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3547737. --> Reported by: [megachriz](https://www.drupal.org/user/654114) Related to !11 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>Sometime ago, I&rsquo;ve been trying the ECA Tamper module and I noticed that some of the plugins did not have any effect in ECA. For example: the plugins <em>hash</em> and <em>rewrite</em>.</p> <p>I checked the code in TamperTrait and I noticed that <code>tamper()</code> is called without a tamperable item:</p> <pre>$value = $tamperPlugin-&gt;tamper($data);</pre><p>This is totally fine, as passing a tamperable item is optional. But there are a few Tamper plugins that can't do anything meaningful without an item. So perhaps it's better to not list these in the UI.</p> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <p>For that, I've been working on adding a definition property called "itemUsage" to Tamper plugins in the Tamper module. The possible values will be "required", "optional", "ignored" or null (not specified). I've been working on that in the following Tamper issue:<br> <span class="drupalorg-gitlab-issue-link project-issue-status-info project-issue-status-7"><a href="https://www.drupal.org/project/tamper/issues/3541650" title="Status: Closed (fixed)">#3541650: Make Tamper plugins tell if they require a tamperable item</a></span></p> <p>When that feature is finalized, ECA Tamper can use that information to filter out all Tamper plugins that say that they <em>require</em> a tamperable item.</p> <p>What do you think of the implementation there?</p> <p>(Note: for the hash plugin an item is currently required, but I'm working on making it optional in <span class="drupalorg-gitlab-issue-link project-issue-status-info project-issue-status-7"><a href="https://www.drupal.org/project/tamper/issues/3419759" title="Status: Closed (fixed)">#3419759: Hash plugin: add an option to create a hash of the current value</a></span>.)</p> <h3 id="summary-remaining-tasks">Remaining tasks</h3> <ul> <li>Review <span class="drupalorg-gitlab-issue-link project-issue-status-info project-issue-status-7"><a href="https://www.drupal.org/project/tamper/issues/3541650" title="Status: Closed (fixed)">#3541650: Make Tamper plugins tell if they require a tamperable item</a></span></li> <li>Filter out Tamper plugins in the UI where "itemUsage" = "required".</li> </ul> <h3 id="summary-ui-changes">User interface changes</h3> <p>Tamper plugins that say that they require a tamperable item are not listed in the UI of ECA Tamper.</p> <h3 id="summary-api-changes">API changes</h3> <p>None.</p> <h3 id="summary-data-model-changes">Data model changes</h3> <p>None.</p>