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Shouldn’t hook_update to add a new field to an entity use the field definition from the entity class?

I was writing an update hook to add a new field to a custom entity and was following the pattern shown here

https://www.drupal.org/node/2554097

/**  * Add 'revision_translation_affected' field to 'node' entities.  */ function node_update_8001() {   // Install the definition that this field had in   // DrupalnodeEntityNode::baseFieldDefinitions()   // at the time that this update function was written. If/when code is   // deployed that changes that definition, the corresponding module must   // implement an update function that invokes   // Drupal::entityDefinitionUpdateManager()->updateFieldStorageDefinition()   // with the new definition.   $storage_definition = BaseFieldDefinition::create('boolean')       ->setLabel(t('Revision translation affected'))       ->setDescription(t('Indicates if the last edit of a translation belongs to current revision.'))       ->setReadOnly(TRUE)       ->setRevisionable(TRUE)       ->setTranslatable(TRUE);    Drupal::entityDefinitionUpdateManager()     ->installFieldStorageDefinition('revision_translation_affected', 'node', 'node', $storage_definition); }

I felt I was duplicating the BaseFieldDefinition in both the custom entity class as well as in the install file. Shouldn’t I be able to use the static function

public static function baseFieldDefinitions(EntityTypeInterface $entity_type)

from the entity class to load the field definition and install it?

This article was republished from its original source.
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Shouldn’t hook_update to add a new field to an entity use the field definition from the entity class?

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