Issue #3236771 by cecrs, sanduhrs: Entity Reference fields broken for PET Entities

pet.install

+<?php
+
+/**
+ * @file
+ * Previewable Email Template install.
+ */
+
+/**
+ * Rename PET table to pets for consistency.
+ */
+function pet_update_8401() {
+  \Drupal::database()->schema()->renameTable('pet', 'pets');
+}
+
+/**
+ * Update PET entity data_table annotation.
+ */
+function pet_update_8402() {
+  // Replace values in the 'entity.definitions.installed' key_value collection.
+  \Drupal::service('entity_field.manager')->clearCachedFieldDefinitions();
+  $key_value_store_definition = \Drupal::keyValue('entity.definitions.installed');
+  $storage_definitions = $key_value_store_definition->get('pet.entity_type');
+  $storage_definitions->set('data_table', 'pets_field_data');
+  $key_value_store_definition->set('pet.entity_type', $storage_definitions);
+}

src/Entity/Pet.php

@@ -32,7 +32,8 @@ use Drupal\pet\PetInterface;
  *     },
  *     "access" = "Drupal\pet\PetAccessControlHandler",
  *   },
- *   base_table = "pets",
+ *   base_table = "pet",
+ *   data_table = "pets_field_data",
  *   admin_persmission = "administer previewable email templates",
  *   fieldable = FALSE,
  *   entity_keys = {