InvalidArgumentException: Field uuid is unknown. in Drupal\Core\Entity\ContentEntityBase->getTranslatedField()
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #2835576. -->
Reported by: [davidwbarratt](https://www.drupal.org/user/411675)
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>If you have an entity (a), that references another entity (b) and (b) is a content entity that does <strong>not</strong> have a <code>uuid</code> field, then you will get this error when you request entity (a) in the <code>hal_json</code> format:</p>
<pre>InvalidArgumentException: Field uuid is unknown. in Drupal\Core\Entity\ContentEntityBase->getTranslatedField() (line 471 of core/lib/Drupal/Core/Entity/ContentEntityBase.php).<br>Drupal\Core\Entity\ContentEntityBase->get('uuid') (Line: 84)<br>Drupal\hal\Normalizer\ContentEntityNormalizer->normalize(Object, 'hal_json', Array) (Line: 128)<br>Symfony\Component\Serializer\Serializer->normalize(Object, 'hal_json', Array) (Line: 70)<br>Drupal\hal\Normalizer\EntityReferenceItemNormalizer->normalize(Object, 'hal_json', Array) (Line: 128)<br>Symfony\Component\Serializer\Serializer->normalize(Object, 'hal_json', Array) (Line: 98)<br>Drupal\hal\Normalizer\FieldNormalizer->normalizeFieldItems(Object, 'hal_json', Array) (Line: 34)<br>Drupal\hal\Normalizer\FieldNormalizer->normalize(Object, 'hal_json', Array) (Line: 128)<br>Symfony\Component\Serializer\Serializer->normalize(Object, 'hal_json', Array) (Line: 96)<br>Drupal\hal\Normalizer\ContentEntityNormalizer->normalize(Object, 'hal_json', Array) (Line: 128)<br>Symfony\Component\Serializer\Serializer->normalize(Object, 'hal_json', Array) (Line: 101)<br>Symfony\Component\Serializer\Serializer->serialize(Object, 'hal_json') (Line: 119)<br>Drupal\rest\RequestHandler->Drupal\rest\{closure}() (Line: 574)<br>Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 120)<br>Drupal\rest\RequestHandler->handle(Object, Object)<br>call_user_func_array(Array, Array) (Line: 123)<br>Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 574)<br>Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124)<br>Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)<br>Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()<br>call_user_func_array(Object, Array) (Line: 144)<br>Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 64)<br>Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57)<br>Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47)<br>Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 47)<br>Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 50)<br>Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 31)<br>Drupal\gc_api\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)<br>Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 628)<br>Drupal\Core\DrupalKernel->handle(Object) (Line: 19)</pre><p>This is happening because in <code>EntityReferenceItemNormalizer</code> we have this:</p>
<pre>$context['included_fields'] = array('uuid');<br><br>// Normalize the target entity.<br>$embedded = $this->serializer->normalize($target_entity, $format, $context);</pre><p>
and then in <code>ContentEntityNormalizer</code> we have this:</p>
<pre>// If the fields to use were specified, only output those field values.<br>if (isset($context['included_fields'])) {<br> $fields = array();<br> foreach ($context['included_fields'] as $field_name) {<br> $fields[] = $entity->get($field_name);<br> }<br>}<br>else {<br> $fields = $entity->getFields();<br>}</pre><p>Since entity (b) does not have <code>uuid</code> then <code>$entity->get('uuid')</code> throws a fatal error.</p>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>Check to see if the referenced entity has a uuid field before attempting to access it.</p>
<h3 id="summary-remaining-tasks">Remaining tasks</h3>
<ol>
<li><del>Write Tests</del></li>
<li><del>Write Patch</del></li>
</ol>
<h3 id="summary-ui-changes">User interface changes</h3>
<p>None.</p>
<h3 id="summary-api-changes">API changes</h3>
<p>Fixes a major bug in the hal module.</p>
<h3 id="summary-data-model-changes">Data model changes</h3>
<p>None.</p>
> Related issue: [Issue #2871591](https://www.drupal.org/node/2871591)
issue
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