--- /dev/null
+<?php
+
+namespace Drupal\entity_test\Entity;
+
+use Drupal\Core\Entity\ContentEntityBase;
+use Drupal\Core\Entity\EntityTypeInterface;
+use Drupal\Core\Field\BaseFieldDefinition;
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\user\EntityOwnerInterface;
+use Drupal\user\UserInterface;
+
+/**
+ * Defines the test entity class.
+ *
+ * @ContentEntityType(
+ * id = "entity_test",
+ * label = @Translation("Test entity"),
+ * handlers = {
+ * "list_builder" = "Drupal\entity_test\EntityTestListBuilder",
+ * "view_builder" = "Drupal\entity_test\EntityTestViewBuilder",
+ * "access" = "Drupal\entity_test\EntityTestAccessControlHandler",
+ * "form" = {
+ * "default" = "Drupal\entity_test\EntityTestForm",
+ * "delete" = "Drupal\entity_test\EntityTestDeleteForm"
+ * },
+ * "route_provider" = {
+ * "html" = "Drupal\Core\Entity\Routing\DefaultHtmlRouteProvider",
+ * },
+ * "translation" = "Drupal\content_translation\ContentTranslationHandler",
+ * "views_data" = "Drupal\entity_test\EntityTestViewsData"
+ * },
+ * base_table = "entity_test",
+ * admin_permission = "administer entity_test content",
+ * persistent_cache = FALSE,
+ * list_cache_contexts = { "entity_test_view_grants" },
+ * entity_keys = {
+ * "id" = "id",
+ * "uuid" = "uuid",
+ * "bundle" = "type",
+ * "label" = "name",
+ * "langcode" = "langcode",
+ * },
+ * links = {
+ * "canonical" = "/entity_test/{entity_test}",
+ * "add-form" = "/entity_test/add",
+ * "edit-form" = "/entity_test/manage/{entity_test}/edit",
+ * "delete-form" = "/entity_test/delete/entity_test/{entity_test}",
+ * },
+ * field_ui_base_route = "entity.entity_test.admin_form",
+ * )
+ */
+class EntityTest extends ContentEntityBase implements EntityOwnerInterface {
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function preCreate(EntityStorageInterface $storage, array &$values) {
+ parent::preCreate($storage, $values);
+ if (empty($values['type'])) {
+ $values['type'] = $storage->getEntityTypeId();
+ }
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
+ $fields = parent::baseFieldDefinitions($entity_type);
+
+ $fields['name'] = BaseFieldDefinition::create('string')
+ ->setLabel(t('Name'))
+ ->setDescription(t('The name of the test entity.'))
+ ->setTranslatable(TRUE)
+ ->setSetting('max_length', 32)
+ ->setDisplayOptions('view', [
+ 'label' => 'hidden',
+ 'type' => 'string',
+ 'weight' => -5,
+ ])
+ ->setDisplayOptions('form', [
+ 'type' => 'string_textfield',
+ 'weight' => -5,
+ ]);
+
+ $fields['created'] = BaseFieldDefinition::create('created')
+ ->setLabel(t('Authored on'))
+ ->setDescription(t('Time the entity was created'))
+ ->setTranslatable(TRUE);
+
+ $fields['user_id'] = BaseFieldDefinition::create('entity_reference')
+ ->setLabel(t('User ID'))
+ ->setDescription(t('The ID of the associated user.'))
+ ->setSetting('target_type', 'user')
+ ->setSetting('handler', 'default')
+ // Default EntityTest entities to have the root user as the owner, to
+ // simplify testing.
+ ->setDefaultValue([0 => ['target_id' => 1]])
+ ->setTranslatable(TRUE)
+ ->setDisplayOptions('form', [
+ 'type' => 'entity_reference_autocomplete',
+ 'weight' => -1,
+ 'settings' => [
+ 'match_operator' => 'CONTAINS',
+ 'size' => '60',
+ 'placeholder' => '',
+ ],
+ ]);
+
+ return $fields;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getOwner() {
+ return $this->get('user_id')->entity;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getOwnerId() {
+ return $this->get('user_id')->target_id;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setOwnerId($uid) {
+ $this->set('user_id', $uid);
+ return $this;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setOwner(UserInterface $account) {
+ $this->set('user_id', $account->id());
+ return $this;
+ }
+
+ /**
+ * Sets the name.
+ *
+ * @param string $name
+ * Name of the entity.
+ *
+ * @return $this
+ */
+ public function setName($name) {
+ $this->set('name', $name);
+ return $this;
+ }
+
+ /**
+ * Returns the name.
+ *
+ * @return string
+ */
+ public function getName() {
+ return $this->get('name')->value;
+ }
+
+}