User error: "0" is an invalid render array key when the SmartDateRecurrenceFormatter has a date with a deleted RRule
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3380500. -->
Reported by: [codebymikey](https://www.drupal.org/user/3573206)
Related to !62
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>If the <code>SmartDateRecurrenceFormatter</code> formatter is used on a pieced of recurring date which happens to no longer have a valid RRule, then <a href="https://git.drupalcode.org/project/smart_date/-/blob/76588a86/modules/smart_date_recur/src/Plugin/Field/FieldFormatter/SmartDateRecurrenceFormatter.php#L223">it stops processing</a> and passes the raw scalar ID assigned <a href="https://git.drupalcode.org/project/smart_date/-/blob/76588a86/modules/smart_date_recur/src/Plugin/Field/FieldFormatter/SmartDateRecurrenceFormatter.php#L189-213">in this block</a> back to the Drupal renderer which is invalid according to <span class="drupalorg-gitlab-issue-link project-issue-status-info project-issue-status-7"><a href="https://www.drupal.org/project/drupal/issues/1283892" title="Status: Closed (fixed)">#1283892: Let Render API fail in a tale-telling way on invalid $element</a></span>.</p>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br>User error</span><span style="color: #007700">: </span><span style="color: #DD0000">"0" </span><span style="color: #0000BB">is an invalid render </span><span style="color: #007700">array </span><span style="color: #0000BB">key in Drupal</span><span style="color: #007700">\</span><span style="color: #0000BB">Core</span><span style="color: #007700">\</span><span style="color: #0000BB">Render</span><span style="color: #007700">\</span><span style="color: #0000BB">Element</span><span style="color: #007700">::</span><span style="color: #0000BB">children</span><span style="color: #007700">() (</span><span style="color: #0000BB">line 98 of </span><span style="color: #007700">/</span><span style="color: #0000BB">app</span><span style="color: #007700">/</span><span style="color: #0000BB">web</span><span style="color: #007700">/</span><span style="color: #0000BB">core</span><span style="color: #007700">/</span><span style="color: #0000BB">lib</span><span style="color: #007700">/</span><span style="color: #0000BB">Drupal</span><span style="color: #007700">/</span><span style="color: #0000BB">Core</span><span style="color: #007700">/</span><span style="color: #0000BB">Render</span><span style="color: #007700">/</span><span style="color: #0000BB">Element</span><span style="color: #007700">.</span><span style="color: #0000BB">php</span><span style="color: #007700">) </span><span style="color: #FF8000">#0<br><br>#1 /app/application/web/core/lib/Drupal/Core/Render/Element.php(98): unknown()<br>#2 /app/application/web/core/lib/Drupal/Core/Field/FormatterBase.php(93): Drupal\Core\Render\Element::children(Array)<br>#3 /app/application/web/core/lib/Drupal/Core/Entity/Entity/EntityViewDisplay.php(265): Drupal\Core\Field\FormatterBase->view(Object(Drupal\smart_date\Plugin\Field\FieldType\SmartDateFieldItemList), 'en')<br>#4 /app/application/web/core/modules/layout_builder/src/Entity/LayoutBuilderEntityViewDisplay.php(266): Drupal\Core\Entity\Entity\EntityViewDisplay->buildMultiple(Array)<br>#5 /app/application/web/core/lib/Drupal/Core/Entity/EntityViewBuilder.php(339): Drupal\layout_builder\Entity\LayoutBuilderEntityViewDisplay->buildMultiple(Array)<br>#6 /app/application/web/core/modules/node/src/NodeViewBuilder.php(24): Drupal\Core\Entity\EntityViewBuilder->buildComponents(Array, Array, Array, 'full')<br>#7 /app/application/web/core/lib/Drupal/Core/Entity/EntityViewBuilder.php(281): Drupal\node\NodeViewBuilder->buildComponents(Array, Array, Array, 'full')<br>#8 /app/application/web/core/lib/Drupal/Core/Entity/EntityViewBuilder.php(238): Drupal\Core\Entity\EntityViewBuilder->buildMultiple(Array)<br>#9 [internal function]: Drupal\Core\Entity\EntityViewBuilder->build(Array)<br></span><span style="color: #0000BB">?></span></span></pre></div>
<h4 id="summary-steps-reproduce">Steps to reproduce</h4>
<p>Attempt to render a recurring date field which for whatever reason no longer has a valid <code>SmartDateRule</code>.</p>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>We could add appropriate handling such that invalid recurring dates are removed from the render array, or better yet, are never passed in the first place. Or if they have to, then they should be placed inside an array with a <code>#rrule_id</code> property instead.</p>
<h3 id="summary-remaining-tasks">Remaining tasks</h3>
<p>Provide a suitable workaround for this edge case.</p>
<h3 id="summary-ui-changes">User interface changes</h3>
<p>N/A</p>
issue
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