site01.module

<?php

use Drupal\file\Entity\File;
use Drupal\image\Entity\ImageStyle;
use Drupal\Core\Url;

/**
 * @file
 * Primary module hooks for site01 module.
 *
 * @DCG
 * This file is no longer required in Drupal 8.
 * @see https://www.drupal.org/node/2217931
 */

/**
 * Provides a theme definition for custom content entity site01
 *
 * {@inheritdoc}
 */
function site01_theme($existing, $type, $theme, $path) {
  $theme = [];

  $theme['site01_entity'] = [
    'path' => $path . '/templates',
    'template' => 'site01_entity',
    'render element' => 'elements',
  ];

  return $theme;
}

function template_preprocess_site01_entity(&$variables) {
  $variables['content'] = [];
  foreach (\Drupal\Core\Render\Element::children($variables['elements']) as $key) {
    $variables['content'][$key] = $variables['elements'][$key];
  }
  /** @var \Drupal\site01\Entity\Site01EntityInterface $entity */
  $entity = $variables['elements']['#site01_entity'];
  //provide the label
  $variables['label'] = $entity->label();
  //provide the alias
  $entityId = $entity->id();
//  $variables['url'] = $entity->toUrl()->toString();
  $variables['url'] = "/blog-list/$entityId";
  $variables['created'] = $entity->getCreatedTime();
  /** @var \Drupal\user\Entity\User $user */
  $user = $entity->getOwner();
  $variables['author_avatar'] = $user->field_avatar;
  $variables['author_name'] = $user->name->value;
}

function site01_theme_suggestions_site01_entity_alter( array &$suggestions, array $vars, $hook ) {
  /** @var \Drupal\site01\Entity\Site01Entity $site01_entity */
  if ( $site01_entity = $vars['elements']['#site01_entity'] ) {
    if (isset($vars['view_mode'])) {
      $suggestions[] = 'site01_entity__' . $vars['#view_mode'];
    }
  }
}