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Creating an instance of custom entity with entity reference field breaks entity collection page

I created two custom entities, entity_one and entity_two. entity_one has a entity reference field that allows you to select unlimited instances of entity_twos. The edit form for entity_one seems to work fine. The field exists and properly auto populates with entity_twos. However as soon as I submit and create an entity_one the list page for entity_ones gives me the error.

Error: Call to a member function getValue() on string in DrupalCoreEntityContentEntityBase->__sleep() (line 524 of core/lib/Drupal/Core/Entity/ContentEntityBase.php).

If I remove that particular field and just have textfields I do not encounter this behavior. It only occurs when I have the entity reference field. My first instinct was maybe in my EntityOneListBuilder.php it uses a field in the table that isn’t properly formatted but the only fields used are ID and title.

Here is a portion of my EntityOneListBuilder

public static function createInstance(ContainerInterface $container, EntityTypeInterface $entity_type) {     return new static(       $entity_type,       $container->get('entity_type.manager')->getStorage($entity_type->id()),       $container->get('url_generator')     );   }    public function render() {     $build['description'] = [       '#markup' => $this->t('Description Text'),     ];     $build['table'] = parent::render();     return $build;   }    public function buildHeader() {     $header['id'] = $this->t('ID');     $header['title'] = $this->t('Title');     return $header + parent::buildHeader();   }       public function buildRow(EntityInterface $entity) {     $row['id'] = $entity->id();     $row['title'] = $entity->toLink()->toString();     return $row + parent::buildRow($entity);   }

And here is how I’m building the entity reference field for entity_one

    $fields['entity_twos'] = BaseFieldDefinition::create('entity_reference')             ->setLabel(t('Form Fields'))             ->setDescription(t('The fields to add to this form.'))             ->setRevisionable(TRUE)             ->setSetting('target_type', 'entity_two')             ->setTargetEntityTypeId('entity_two')             ->setSetting('handler','default')             ->setDisplayOptions('view', [                 'label' => 'hidden',                 'type' => 'entity_two',                 'weight' => 0,             ])             ->setDisplayOptions('form', [                 'type' => 'entity_reference_autocomplete',                 'weight' => 5,                 'settings' => [                     'autocomplete_type' => 'tags',                     'size' => '60',                     'match_operator' => 'CONTAINS',                     'placeholder' => '',                 ],             ])             ->setDisplayConfigurable('form', true)             ->setDisplayConfigurable('view', true)             ->setRequired(TRUE)             ->setCardinality(FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED);

Why would that particular field break my collection page?

This article was republished from its original source.
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Creating an instance of custom entity with entity reference field breaks entity collection page

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