Term.php

<?php
/**
* @file
* Contains \Drupal\example_module\Entity\ContentEntityExample.
*/

namespace Drupal\example_module\Entity;

use Drupal\Core\Entity\EntityStorageInterface;
use Drupal\Core\Field\BaseFieldDefinition;
use Drupal\Core\Entity\ContentEntityBase;
use Drupal\Core\Entity\EntityTypeInterface;
use Drupal\user\UserInterface;
use Drupal\Core\Entity\EntityChangedTrait;

/**
 * Defines the ContentEntityExample entity.
 *
 * @ingroup dictionary
 *
 *@ContentEntityType(
 *   id = "dictionary_term",
 *   label = @Translation("Dictionary Term entity"),
 *   handlers = {
 *     "view_builder" = "Drupal\Core\Entity\EntityViewBuilder",
 *     "list_builder" = "Drupal\example_module\Entity\Controller\TermListBuilder",
 *     "form" = {
 *       "add" = "Drupal\example_module\Form\TermForm",
 *       "edit" = "Drupal\example_module\Form\TermForm",
 *       "delete" = "Drupal\example_module\Form\TermDeleteForm",
 *     },
 *     "access" = "Drupal\example_module\TermAccessControlHandler",
 *   },
 *   list_cache_contexts = { "user" },
 *   base_table = "dictionary_term",
 *   admin_permission = "administer dictionary_term entity",
 *   entity_keys = {
 *     "id" = "id",
 *     "uuid" = "uuid",
 *     "user_id" = "user_id",
 *     "created" = "created",
 *     "changed" = "changed",
 *     "pl" = "pl",
 *     "en" = "en",
 *   },
 *   links = {
 *     "canonical" = "/dictionary_term/{dictionary_term}",
 *     "edit-form" = "/dictionary_term/{dictionary_term}/edit",
 *     "delete-form" = "/dictionary_term/{dictionary_term}/delete",
 *     "collection" = "/dictionary_term/list"
 *   },
 *   field_ui_base_route = "entity.dictionary.term_settings",
 * )
 */
class Term extends ContentEntityBase {

use EntityChangedTrait;

    /**
    * {@inheritdoc}
    *
    * When a new entity instance is added, set the user_id entity reference to
    * the current user as the creator of the instance.
    */
    public static function preCreate(EntityStorageInterface $storage_controller, array &$values) {
        parent::preCreate($storage_controller, $values);
        // Default author to current user.
        $values += array(
            'user_id' => \Drupal::currentUser()->id(),
        )??[];
    }

    /**
    * {@inheritdoc}
    *
    * Define the field properties here.
    *
    * Field name, type and size determine the table structure.
    *
    * In addition, we can define how the field and its content can be manipulated
    * in the GUI. The behaviour of the widgets used can be determined here.
    */
    public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {

        // Standard field, used as unique if primary index.
        $fields['id'] = BaseFieldDefinition::create('integer')
            ->setLabel(t('ID'))
            ->setDescription(t('The ID of the Term entity.'))
            ->setReadOnly(TRUE);

            // Standard field, unique outside of the scope of the current project.
            $fields['uuid'] = BaseFieldDefinition::create('uuid')
            ->setLabel(t('UUID'))
            ->setDescription(t('The UUID of the Contact entity.'))
            ->setReadOnly(TRUE);

        // Name field for the contact.
        // We set display options for the view as well as the form.
        // Users with correct privileges can change the view and edit configuration.
        $fields['pl'] = BaseFieldDefinition::create('string')
            ->setLabel(t('Polish'))
            ->setDescription(t('Polish version.'))
            ->setSettings(array(
                'default_value' => '',
                'max_length' => 255,
                'text_processing' => 0,
            ))
            ->setDisplayOptions('view', array(
                'label' => 'above',
                'type' => 'string',
                'weight' => -6,
            ))
            ->setDisplayOptions('form', array(
                'type' => 'string_textfield',
                'weight' => -6,
            ))
            ->setDisplayConfigurable('form', TRUE)
            ->setDisplayConfigurable('view', TRUE);

        $fields['en'] = BaseFieldDefinition::create('string')
            ->setLabel(t('English'))
                ->setDescription(t('English version.'))
            ->setSettings(array(
                'default_value' => '',
                'max_length' => 255,
                'text_processing' => 0,
            ))
            ->setDisplayOptions('view', array(
                'label' => 'above',
                'type' => 'string',
                'weight' => -4,
            ))
            ->setDisplayOptions('form', array(
                'type' => 'string_textfield',
                'weight' => -4,
            ))
            ->setDisplayConfigurable('form', TRUE)
           ->setDisplayConfigurable('view', TRUE);

        // Owner field of the contact.
        // Entity reference field, holds the reference to the user object.
        // The view shows the user name field of the user.
        // The form presents a auto complete field for the user name.
        $fields['user_id'] = BaseFieldDefinition::create('entity_reference')
                ->setLabel(t('User Name'))
                ->setDescription(t('The Name of the associated user.'))
                ->setSetting('target_type', 'user')
                ->setSetting('handler', 'default')
                ->setDisplayOptions('view', array(
                'label' => 'above',
                'type' => 'author',
                'weight' => -3,
            ))
            ->setDisplayOptions('form', array(
                'type' => 'entity_reference_autocomplete',
                'settings' => array(
                'match_operator' => 'CONTAINS',
                'size' => 60,
                'placeholder' => '',
                ),
                'weight' => -3,
            ))
            ->setDisplayConfigurable('form', TRUE)
            ->setDisplayConfigurable('view', TRUE);

        $fields['created'] = BaseFieldDefinition::create('created')
            ->setLabel(t('Created'))
            ->setDescription(t('The time that the entity was created.'));

        $fields['changed'] = BaseFieldDefinition::create('changed')
            ->setLabel(t('Changed'))
            ->setDescription(t('The time that the entity was last edited.'));

        return $fields;
    }

}