[fix] Replace self:: calls with static:: for extensible abstract …

…class

src/Domain/AbstractRepository.php

@@ -126,7 +126,7 @@ protected static function getAllFromDB(): array {
         $posts = static::getPosts();
 
         foreach($posts as $post) {
-            $entity = self::entityFromPostId($post->ID, $post);
+            $entity = static::entityFromPostId($post->ID, $post);
 
             $result[$post->ID] = [
                 'item'  => $entity,
@@ -183,7 +183,7 @@ protected function getById(?int $postId, &$isDirty = null): ?StorableEntity
             $isDirty = false;
 
             try {
-                $entity = self::entityFromPostId($postId);
+                $entity = static::entityFromPostId($postId);
                 $this->entities[$postId] = [
                     'item'  => $entity,
                     'dirty' => false,
@@ -225,7 +225,7 @@ protected static function entityFromPostId(int $postId, WP_Post $post = null): S
             $post = get_post($postId);
         }
 
-        $meta = self::getMetaValues($postId);
+        $meta = static::getMetaValues($postId);
 
         return new static::$entityClass($post, $meta);
     }
@@ -237,6 +237,6 @@ protected static function entityFromPostId(int $postId, WP_Post $post = null): S
      */
     protected function persist(StorableEntity $item): void
     {
-        update_post_meta($item->getPostId(), self::$metaKey, $item->toMetaValues());
+        update_post_meta($item->getPostId(), static::$metaKey, $item->toMetaValues());
     }
 }